Configuración fiscal para proformas

docs/customer-invoices/proforma-create-contract.md

@@ -11,7 +11,7 @@ Definir la semantica correcta de `create proforma` como creacion de cabecera ini
 En create:
 
 - `taxRegimeCode` representa configuracion fiscal inicial
-- `taxDefaults` sigue siendo un concepto de UI o resolucion interna, no un desglose fiscal persistido
+- `tax_config` representa la configuracion fiscal persistida de cabecera
 - `taxes` representa impuestos realmente calculados desde lineas valoradas
 - `totals` representa importes realmente calculados desde lineas valoradas
 
@@ -43,6 +43,14 @@ Si `items` se omite o se envia como `[]`:
   payment_method_id?: string | null;
   payment_term_id?: string | null;
   tax_regime_code?: string | null;
+  tax_config?: {
+    tax_mode?: "single" | "per_line";
+    default_iva_code?: string | null;
+    uses_equivalence_surcharge?: boolean;
+    default_rec_code?: string | null;
+    uses_retention?: boolean;
+    default_retention_code?: string | null;
+  };
   items?: [];
 }
 ```
@@ -52,6 +60,7 @@ Notas:
 - el contrato actual del modulo puede seguir exigiendo otros campos tecnicos ya existentes
 - `items` es opcional; si existe, puede ir vacio
 - no se usan defaults ocultos en Zod para disfrazar la intencion del request
+- si no se informa `tax_config`, el backend resuelve defaults iniciales y los persiste
 
 ## Response esperada al crear sin lineas
 
@@ -83,6 +92,7 @@ Adaptando nombres exactos al contrato publico actual:
 ## Punto correcto de calculo
 
 - `create` crea cabecera minima, numera y resuelve defaults
+- `create` persiste tambien el `tax_config` resuelto
 - `update` permite anadir o editar lineas
 - al existir lineas valoradas, `update` recalcula `taxes` y `totals`
 

docs/customer-invoices/proforma-series-contract.md

@@ -59,6 +59,7 @@ En proformas:
 - el backend emite `target_invoice_series_code` como nombre preferente
 - `series` puede mantenerse solo como alias legacy de salida mientras existan consumidores antiguos
 - `taxes` representa impuestos calculados a partir de lineas valoradas
+- `tax_config` representa la configuracion fiscal persistida de cabecera
 - `totals` representa importes calculados a partir de lineas valoradas
 - create no debe inventar filas fiscales sobre base `0`
 

docs/customer-invoices/proforma-tax-config.md

@@ -0,0 +1,81 @@
+# Proforma Tax Config
+
+## Objetivo
+
+Persistir la configuracion fiscal de cabecera de una proforma sin confundirla con los impuestos realmente calculados desde lineas valoradas.
+
+## Alcance
+
+- `tax_regime_code` sigue representando el regimen fiscal general
+- `tax_config` representa los controles fiscales de cabecera usados por la UI
+- `taxes` sigue representando solo desglose fiscal materializado
+- `totals` sigue representando solo importes calculados desde lineas valoradas
+
+## Campos persistidos en `proformas`
+
+- `tax_mode`
+- `default_iva_code`
+- `uses_equivalence_surcharge`
+- `default_rec_code`
+- `uses_retention`
+- `default_retention_code`
+
+## Contrato publico
+
+`GET /proformas/:id` debe devolver:
+
+```ts
+{
+  tax_regime: {
+    code: string;
+    name: string;
+    description: string;
+  } | null;
+  tax_config: {
+    tax_mode: "single" | "per_line";
+    default_iva_code: string | null;
+    uses_equivalence_surcharge: boolean;
+    default_rec_code: string | null;
+    uses_retention: boolean;
+    default_retention_code: string | null;
+  };
+}
+```
+
+`POST /proformas` y `PATCH /proformas/:id` pueden aceptar `tax_config` como bloque independiente de `items`.
+
+## Regla funcional
+
+- una proforma puede existir con `items = []`
+- en ese caso `taxes = []`
+- en ese caso todos los totales monetarios deben quedar a `0`
+- la UI debe hidratar los controles de fiscalidad desde `tax_config`, no desde `taxes`
+
+## Resolucion de defaults en create
+
+Los defaults del cliente solo se usan al crear la proforma y el resultado se persiste.
+
+Fallback actual:
+
+- IVA por defecto: `iva_21`
+- recargo de equivalencia: desactivado salvo indicacion explicita
+- retencion: desactivada salvo indicacion explicita
+- codigo de retencion por defecto si `uses_retention = true`: `retention_15`
+
+## Regla de update
+
+`tax_config` se actualiza de forma parcial y se mergea sobre la configuracion persistida actual.
+
+No debe reconstruirse desde:
+
+- `taxes`
+- el cliente actual
+- defaults implícitos de frontend
+
+## No incluido
+
+- nueva tabla para configuracion fiscal
+- recalculo fiscal fuera del flujo normal de lineas
+- cambios de Verifacti
+- cobros o vencimientos vivos
+- rectificativas

docs/customer-invoices/split-proformas-issued-invoices-migration.md

@@ -151,6 +151,7 @@ Preparar el esquema fisico para separar:
 - create de proforma se consolida como creacion de cabecera/documento inicial
 - una proforma sin lineas es valida y debe persistirse con `items = []`
 - `tax_regime_code` queda como configuracion fiscal inicial de la cabecera
+- `tax_config` queda persistido en `proformas` como configuracion fiscal de cabecera
 - `proforma_taxes` solo representa impuestos calculados, no defaults fiscales ni placeholders sobre base `0`
 - si una proforma nace sin lineas, la response debe devolver `taxes = []` y totales monetarios a `0`
 - update sigue siendo el punto donde se anaden lineas y se materializan impuestos/totales reales

docs/customer-invoices/sql/add-proforma-tax-config-columns.sql

@@ -0,0 +1,15 @@
+ALTER TABLE proformas
+  ADD COLUMN IF NOT EXISTS tax_mode VARCHAR(20) NOT NULL DEFAULT 'single',
+  ADD COLUMN IF NOT EXISTS default_iva_code VARCHAR(64) NULL,
+  ADD COLUMN IF NOT EXISTS uses_equivalence_surcharge TINYINT(1) NOT NULL DEFAULT 0,
+  ADD COLUMN IF NOT EXISTS default_rec_code VARCHAR(64) NULL,
+  ADD COLUMN IF NOT EXISTS uses_retention TINYINT(1) NOT NULL DEFAULT 0,
+  ADD COLUMN IF NOT EXISTS default_retention_code VARCHAR(64) NULL;
+
+UPDATE proformas
+SET
+  tax_mode = COALESCE(NULLIF(tax_mode, ''), 'single'),
+  default_iva_code = COALESCE(default_iva_code, 'iva_21'),
+  uses_equivalence_surcharge = COALESCE(uses_equivalence_surcharge, 0),
+  uses_retention = COALESCE(uses_retention, 0)
+WHERE 1 = 1;

docs/customer-invoices/sql/validate-proforma-tax-config.sql

@@ -0,0 +1,28 @@
+SELECT
+  p.id,
+  p.proforma_reference,
+  p.tax_mode,
+  p.default_iva_code,
+  p.uses_equivalence_surcharge,
+  p.default_rec_code,
+  p.uses_retention,
+  p.default_retention_code
+FROM proformas p
+WHERE p.tax_mode NOT IN ('single', 'per_line')
+   OR (p.uses_equivalence_surcharge = 1 AND p.default_iva_code IS NULL)
+   OR (p.uses_equivalence_surcharge = 0 AND p.default_rec_code IS NOT NULL)
+   OR (p.uses_retention = 0 AND p.default_retention_code IS NOT NULL);
+
+SELECT
+  p.id,
+  p.proforma_reference,
+  COUNT(DISTINCT pi.item_id) AS item_rows,
+  COUNT(DISTINCT pt.tax_id) AS tax_rows
+FROM proformas p
+LEFT JOIN proforma_items pi
+  ON pi.proforma_id = p.id
+LEFT JOIN proforma_taxes pt
+  ON pt.proforma_id = p.id
+GROUP BY p.id, p.proforma_reference
+HAVING COUNT(DISTINCT pi.item_id) = 0
+   AND COUNT(DISTINCT pt.tax_id) > 0;

modules/customer-invoices/src/api/application/proformas/di/proforma-creator.di.ts

@@ -1,3 +1,5 @@
+import type { ICustomerPublicServices } from "@erp/customers/api";
+
 import type { IProformaRepository } from "../repositories";
 import type { ProformaPaymentResolver } from "../services";
 import {
@@ -16,6 +18,7 @@ export const buildProformaCreator = (params: {
   repository: IProformaRepository;
   proformaSeriesValidator: ProformaSeriesValidator;
   targetInvoiceSeriesValidator: ProformaTargetInvoiceSeriesValidator;
+  customerServices: ICustomerPublicServices;
 }): IProformaCreator => {
   return new ProformaCreator(params);
 };

modules/customer-invoices/src/api/application/proformas/mappers/create-proforma-input.mapper.ts

@@ -20,11 +20,13 @@ import {
   ItemAmount,
   ItemDescription,
   ItemQuantity,
+  type ProformaTaxMode,
   type ProformaRecipient,
 } from "../../../domain";
 import type {
   ProformaCreateInputProps,
   ProformaItemCreateInputProps,
+  ProformaTaxConfigInputProps,
   ProformaItemTaxCodesInput,
 } from "../models";
 
@@ -132,6 +134,8 @@ export class CreateProformaInputMapper implements ICreateProformaInputMapper {
         errors
       );
 
+      const taxConfig = this.mapTaxConfig(dto.tax_config, errors);
+
       const items = this.mapItemsProps(dto.items ?? [], {
         languageCode: languageCode!,
         currencyCode: currencyCode!,
@@ -164,6 +168,7 @@ export class CreateProformaInputMapper implements ICreateProformaInputMapper {
         linkedInvoiceId: Maybe.none(),
 
         taxRegimeCode: taxRegimeCode!,
+        taxConfig,
         paymentMethodId: paymentMethodId!,
 
         globalDiscountPercentage: globalDiscountPercentage!,
@@ -284,6 +289,77 @@ export class CreateProformaInputMapper implements ICreateProformaInputMapper {
     };
   }
 
+  private mapTaxConfig(
+    taxConfigDTO: CreateProformaRequestDTO["tax_config"],
+    errors: ValidationErrorDetail[]
+  ): ProformaTaxConfigInputProps | undefined {
+    if (!taxConfigDTO) {
+      return undefined;
+    }
+
+    return {
+      taxMode: this.mapTaxMode(taxConfigDTO.tax_mode, "tax_config.tax_mode", errors),
+      defaultIvaCode: this.mapOptionalString(
+        taxConfigDTO.default_iva_code,
+        "tax_config.default_iva_code",
+        errors
+      ),
+      usesEquivalenceSurcharge: taxConfigDTO.uses_equivalence_surcharge,
+      defaultRecCode: this.mapOptionalString(
+        taxConfigDTO.default_rec_code,
+        "tax_config.default_rec_code",
+        errors
+      ),
+      usesRetention: taxConfigDTO.uses_retention,
+      defaultRetentionCode: this.mapOptionalString(
+        taxConfigDTO.default_retention_code,
+        "tax_config.default_retention_code",
+        errors
+      ),
+    };
+  }
+
+  private mapTaxMode(
+    taxMode: "single" | "per_line" | undefined,
+    path: string,
+    errors: ValidationErrorDetail[]
+  ): ProformaTaxMode | undefined {
+    if (taxMode === undefined) {
+      return undefined;
+    }
+
+    if (taxMode === "single") {
+      return "single";
+    }
+
+    if (taxMode === "per_line") {
+      return "perLine";
+    }
+
+    errors.push({
+      path,
+      message: "Invalid tax mode",
+    });
+
+    return undefined;
+  }
+
+  private mapOptionalString(
+    value: string | null | undefined,
+    path: string,
+    errors: ValidationErrorDetail[]
+  ): Maybe<string> | undefined {
+    if (value === undefined) {
+      return undefined;
+    }
+
+    return extractOrPushError(
+      maybeFromNullableResult(value, (currentValue) => Result.ok(String(currentValue))),
+      path,
+      errors
+    );
+  }
+
   private throwIfValidationErrors(errors: ValidationErrorDetail[]): void {
     if (errors.length > 0) {
       throw new ValidationErrorCollection("Proforma props mapping failed", errors);

modules/customer-invoices/src/api/application/proformas/mappers/update-proforma-input.mapper.ts

@@ -15,11 +15,18 @@ import {
 import { Maybe, Result, isNullishOrEmpty, toPatchField } from "@repo/rdx-utils";
 
 import type { UpdateProformaByIdRequestDTO } from "../../../../common/dto";
-import { InvoiceSerie, ItemAmount, ItemDescription, ItemQuantity } from "../../../domain";
+import {
+  InvoiceSerie,
+  ItemAmount,
+  ItemDescription,
+  ItemQuantity,
+  type ProformaTaxMode,
+} from "../../../domain";
 import type {
   ProformaItemPatchInputProps,
   ProformaItemTaxCodesInput,
   ProformaPatchInputProps,
+  ProformaTaxConfigPatchInputProps,
 } from "../models";
 
 export interface IUpdateProformaInputMapper {
@@ -183,6 +190,10 @@ export class UpdateProformaInputMapper implements IUpdateProformaInputMapper {
         );
       });
 
+      if (dto.tax_config !== undefined) {
+        proformaPatchProps.taxConfig = this.mapTaxConfigPatch(dto.tax_config, errors);
+      }
+
       if (dto.items !== undefined) {
         proformaPatchProps.items = this.mapItemsProps(dto.items, { errors });
       }
@@ -257,6 +268,73 @@ export class UpdateProformaInputMapper implements IUpdateProformaInputMapper {
     return Maybe.some(String(code).trim());
   }
 
+  private mapTaxConfigPatch(
+    taxConfigDTO: NonNullable<UpdateProformaByIdRequestDTO["tax_config"]>,
+    errors: ValidationErrorDetail[]
+  ): ProformaTaxConfigPatchInputProps {
+    return {
+      taxMode: this.mapTaxMode(taxConfigDTO.tax_mode, "tax_config.tax_mode", errors),
+      defaultIvaCode: this.mapOptionalString(
+        taxConfigDTO.default_iva_code,
+        "tax_config.default_iva_code",
+        errors
+      ),
+      usesEquivalenceSurcharge: taxConfigDTO.uses_equivalence_surcharge,
+      defaultRecCode: this.mapOptionalString(
+        taxConfigDTO.default_rec_code,
+        "tax_config.default_rec_code",
+        errors
+      ),
+      usesRetention: taxConfigDTO.uses_retention,
+      defaultRetentionCode: this.mapOptionalString(
+        taxConfigDTO.default_retention_code,
+        "tax_config.default_retention_code",
+        errors
+      ),
+    };
+  }
+
+  private mapTaxMode(
+    taxMode: "single" | "per_line" | undefined,
+    path: string,
+    errors: ValidationErrorDetail[]
+  ): ProformaTaxMode | undefined {
+    if (taxMode === undefined) {
+      return undefined;
+    }
+
+    if (taxMode === "single") {
+      return "single";
+    }
+
+    if (taxMode === "per_line") {
+      return "perLine";
+    }
+
+    errors.push({
+      path,
+      message: "Invalid tax mode",
+    });
+
+    return undefined;
+  }
+
+  private mapOptionalString(
+    value: string | null | undefined,
+    path: string,
+    errors: ValidationErrorDetail[]
+  ): Maybe<string> | undefined {
+    if (value === undefined) {
+      return undefined;
+    }
+
+    return extractOrPushError(
+      maybeFromNullableResult(value, (currentValue) => Result.ok(String(currentValue))),
+      path,
+      errors
+    );
+  }
+
   private throwIfValidationErrors(errors: ValidationErrorDetail[]): void {
     if (errors.length > 0) {
       throw new ValidationErrorCollection("Proforma props mapping failed", errors);

modules/customer-invoices/src/api/application/proformas/models/proforma-create-input.model.ts

@@ -1,4 +1,4 @@
-import type { IProformaCreateProps, IProformaItemCreateProps } from "../../../domain";
+import type { IProformaCreateProps, IProformaItemCreateProps, ProformaTaxMode } from "../../../domain";
 import type { Maybe } from "@repo/rdx-utils";
 import type { InvoiceSerie } from "../../../domain";
 
@@ -14,12 +14,22 @@ import type { ProformaItemTaxCodesInput } from "./proforma-item-tax-codes-input.
  * - Se encargan de validar y convertir los datos recibidos en formatos adecuados para el dominio.
  */
 
+export interface ProformaTaxConfigInputProps {
+  taxMode?: ProformaTaxMode;
+  defaultIvaCode?: Maybe<string>;
+  usesEquivalenceSurcharge?: boolean;
+  defaultRecCode?: Maybe<string>;
+  usesRetention?: boolean;
+  defaultRetentionCode?: Maybe<string>;
+}
+
 export type ProformaCreateInputProps = Omit<
   IProformaCreateProps,
-  "items" | "proformaReference" | "proformaNumber" | "documentSeriesId" | "series"
+  "items" | "proformaReference" | "proformaNumber" | "documentSeriesId" | "series" | "taxConfig"
 > & {
   proformaSeriesCode: Maybe<InvoiceSerie>;
   targetInvoiceSeriesCode: Maybe<InvoiceSerie>;
+  taxConfig?: ProformaTaxConfigInputProps;
   items: ProformaItemCreateInputProps[];
 };
 

modules/customer-invoices/src/api/application/proformas/models/proforma-update-input.model.ts

@@ -1,4 +1,8 @@
-import type { ProformaItemPatchProps, ProformaPatchProps } from "../../../domain";
+import type {
+  ProformaItemPatchProps,
+  ProformaPatchProps,
+  ProformaTaxMode,
+} from "../../../domain";
 import type { Maybe } from "@repo/rdx-utils";
 import type { InvoiceSerie } from "../../../domain";
 
@@ -14,8 +18,18 @@ import type { ProformaItemTaxCodesInput } from "./proforma-item-tax-codes-input.
  * - Se encargan de validar y convertir los datos recibidos en formatos adecuados para el dominio.
  */
 
+export interface ProformaTaxConfigPatchInputProps {
+  taxMode?: ProformaTaxMode;
+  defaultIvaCode?: Maybe<string>;
+  usesEquivalenceSurcharge?: boolean;
+  defaultRecCode?: Maybe<string>;
+  usesRetention?: boolean;
+  defaultRetentionCode?: Maybe<string>;
+}
+
 export type ProformaPatchInputProps = Omit<ProformaPatchProps, "items" | "series"> & {
   targetInvoiceSeriesCode?: Maybe<InvoiceSerie>;
+  taxConfig?: ProformaTaxConfigPatchInputProps;
   items?: ProformaItemPatchInputProps[];
 };
 

modules/customer-invoices/src/api/application/proformas/services/catalog-resolver/proforma-tax-resolver.ts

@@ -22,6 +22,12 @@ export interface EnsureProformaItemTaxesParams {
   taxCodes: ProformaItemTaxCodesInput;
 }
 
+export interface FindActiveProformaTaxDefinitionByCodeParams {
+  companyId: UniqueID;
+  atDate: UtcDate;
+  code: string;
+}
+
 /**
  * Resuelve datos fiscales externos al agregado de proforma usando servicios públicos de `catalogs`.
  *
@@ -115,6 +121,16 @@ export class ProformaTaxResolver {
     });
   }
 
+  public async findActiveTaxDefinitionByCode(
+    params: FindActiveProformaTaxDefinitionByCodeParams
+  ): Promise<Result<Maybe<TaxDefinitionPublicModel>, Error>> {
+    return this.deps.taxDefinitionFinder.findActiveByCode({
+      companyId: params.companyId,
+      code: params.code,
+      atDate: params.atDate,
+    });
+  }
+
   private collectCodes(taxCodes: ProformaItemTaxCodesInput): Collection<string> {
     const codes = [taxCodes.ivaCode, taxCodes.recCode, taxCodes.retentionCode]
       .filter((code) => code.isSome())

modules/customer-invoices/src/api/application/proformas/services/proforma-creator.ts

@@ -1,3 +1,4 @@
+import type { ICustomerPublicServices } from "@erp/customers/api";
 import type { UniqueID } from "@repo/rdx-ddd";
 import { Maybe, Result } from "@repo/rdx-utils";
 
@@ -6,8 +7,10 @@ import {
   type IProformaItemCreateProps,
   InvoiceNumber,
   Proforma,
+  ProformaTaxConfig,
+  type ProformaTaxMode,
 } from "../../../domain";
-import type { ProformaCreateInputProps } from "../models";
+import type { ProformaCreateInputProps, ProformaTaxConfigInputProps } from "../models";
 import type { IProformaRepository } from "../repositories";
 
 import type { ProformaPaymentResolver } from "./catalog-resolver/proforma-payment-resolver";
@@ -36,13 +39,14 @@ export class ProformaCreator implements IProformaCreator {
       paymentResolver: ProformaPaymentResolver;
       proformaSeriesValidator: ProformaSeriesValidator;
       targetInvoiceSeriesValidator: ProformaTargetInvoiceSeriesValidator;
+      customerServices: ICustomerPublicServices;
     }
   ) {}
 
   async create(params: IProformaCreatorParams): Promise<Result<Proforma, Error>> {
     const { companyId, id, props, transaction } = params;
 
-    const resolvedProps = await this.resolveCreateProps(props);
+    const resolvedProps = await this.resolveCreateProps(props, transaction);
 
     if (resolvedProps.isFailure) {
       return Result.fail(resolvedProps.error);
@@ -132,14 +136,30 @@ export class ProformaCreator implements IProformaCreator {
   }
 
   private async resolveCreateProps(
-    props: ProformaCreateInputProps
+    props: ProformaCreateInputProps,
+    transaction?: unknown
   ): Promise<
     Result<Omit<IProformaCreateProps, "proformaReference" | "proformaNumber" | "documentSeriesId">, Error>
   > {
-    // TODO: Esto hay que cambiarlo en el futuro para buscar valores por defecto, desde la empresa o desde el cliente
+    const customerResult = await this.deps.customerServices.getCustomerById(props.customerId, {
+      companyId: props.companyId,
+      transaction,
+    });
+
+    if (customerResult.isFailure) {
+      return Result.fail(customerResult.error);
+    }
+
+    const customer = customerResult.data;
+
     const _newProps = {
       ...props,
-      taxRegimeCode: props.taxRegimeCode.isNone() ? Maybe.some("01") : props.taxRegimeCode,
+      taxRegimeCode:
+        props.taxRegimeCode.isNone()
+          ? customer.taxRegimeCode.isSome()
+            ? customer.taxRegimeCode
+            : Maybe.some("01")
+          : props.taxRegimeCode,
     };
 
     // Tax Regime => comprobar que existe
@@ -162,6 +182,17 @@ export class ProformaCreator implements IProformaCreator {
       return Result.fail(paymentMethodResult.error);
     }
 
+    const taxConfigResult = await this.resolveTaxConfig({
+      companyId: _newProps.companyId,
+      atDate: _newProps.proformaDate,
+      customer,
+      override: props.taxConfig,
+    });
+
+    if (taxConfigResult.isFailure) {
+      return Result.fail(taxConfigResult.error);
+    }
+
     // En create una proforma puede nacer sin líneas: en ese caso solo persistimos
     // cabecera + defaults iniciales. Los impuestos y totales materializados salen
     // de `items`, así que con `items = []` no se generan filas fiscales.
@@ -186,7 +217,177 @@ export class ProformaCreator implements IProformaCreator {
 
     return Result.ok({
       ..._newProps,
+      taxConfig: taxConfigResult.data,
       items: resolvedItems,
     });
   }
+
+  private async resolveTaxConfig(params: {
+    companyId: UniqueID;
+    atDate: IProformaCreateProps["proformaDate"];
+    customer: Awaited<ReturnType<ICustomerPublicServices["getCustomerById"]>> extends Result<
+      infer T,
+      Error
+    >
+      ? T
+      : never;
+    override?: ProformaTaxConfigInputProps;
+  }): Promise<Result<ProformaTaxConfig, Error>> {
+    const taxMode = params.override?.taxMode ?? "single";
+    const defaultIvaCode =
+      params.override?.defaultIvaCode ??
+      Maybe.some(this.resolveDefaultIvaCodeFromCustomer(params.customer) ?? "iva_21");
+
+    const usesEquivalenceSurcharge =
+      params.override?.usesEquivalenceSurcharge ?? params.customer.usesEquivalenceSurcharge;
+    const usesRetention = params.override?.usesRetention ?? params.customer.usesRetention;
+
+    const defaultRecCode = await this.resolveDefaultRecCode({
+      companyId: params.companyId,
+      atDate: params.atDate,
+      defaultIvaCode,
+      usesEquivalenceSurcharge,
+      requestedCode: params.override?.defaultRecCode,
+    });
+
+    if (defaultRecCode.isFailure) {
+      return Result.fail(defaultRecCode.error);
+    }
+
+    const defaultRetentionCode = await this.resolveRetentionCode({
+      companyId: params.companyId,
+      atDate: params.atDate,
+      usesRetention,
+      requestedCode: params.override?.defaultRetentionCode,
+    });
+
+    if (defaultRetentionCode.isFailure) {
+      return Result.fail(defaultRetentionCode.error);
+    }
+
+    const createdTaxConfig = ProformaTaxConfig.create({
+      taxMode,
+      defaultIvaCode,
+      usesEquivalenceSurcharge,
+      defaultRecCode: defaultRecCode.data,
+      usesRetention,
+      defaultRetentionCode: defaultRetentionCode.data,
+    });
+
+    if (createdTaxConfig.isFailure) {
+      return Result.fail(createdTaxConfig.error);
+    }
+
+    return Result.ok(createdTaxConfig.data);
+  }
+
+  private resolveDefaultIvaCodeFromCustomer(
+    _customer: Awaited<ReturnType<ICustomerPublicServices["getCustomerById"]>> extends Result<
+      infer T,
+      Error
+    >
+      ? T
+      : never
+  ): string | null {
+    return null;
+  }
+
+  private async resolveDefaultRecCode(params: {
+    companyId: UniqueID;
+    atDate: IProformaCreateProps["proformaDate"];
+    defaultIvaCode: Maybe<string>;
+    usesEquivalenceSurcharge: boolean;
+    requestedCode?: Maybe<string>;
+  }): Promise<Result<Maybe<string>, Error>> {
+    if (!params.usesEquivalenceSurcharge) {
+      return Result.ok(Maybe.none());
+    }
+
+    const ivaCode = this.maybeValue(params.defaultIvaCode);
+
+    if (!ivaCode) {
+      return Result.ok(Maybe.none());
+    }
+
+    const ivaDefinition = await this.deps.taxResolver.findActiveTaxDefinitionByCode({
+      companyId: params.companyId,
+      atDate: params.atDate,
+      code: ivaCode,
+    });
+
+    if (ivaDefinition.isFailure) {
+      return Result.fail(ivaDefinition.error);
+    }
+
+    if (ivaDefinition.data.isNone()) {
+      return Result.fail(new Error(`Tax definition not found: ${ivaCode}`));
+    }
+
+    const allowedSurchargeCodes = ivaDefinition.data.unwrap().allowedSurchargeCodes.getAll();
+    const requestedCode = this.maybeValue(params.requestedCode) ?? this.defaultRecForIva(ivaCode);
+
+    if (requestedCode && allowedSurchargeCodes.includes(requestedCode)) {
+      return Result.ok(Maybe.some(requestedCode));
+    }
+
+    const fallbackCode = allowedSurchargeCodes[0] ?? null;
+
+    return Result.ok(fallbackCode ? Maybe.some(fallbackCode) : Maybe.none());
+  }
+
+  private async resolveRetentionCode(params: {
+    companyId: UniqueID;
+    atDate: IProformaCreateProps["proformaDate"];
+    usesRetention: boolean;
+    requestedCode?: Maybe<string>;
+  }): Promise<Result<Maybe<string>, Error>> {
+    if (!params.usesRetention) {
+      return Result.ok(Maybe.none());
+    }
+
+    const retentionCode = this.maybeValue(params.requestedCode) ?? "retention_15";
+
+    const definition = await this.deps.taxResolver.findActiveTaxDefinitionByCode({
+      companyId: params.companyId,
+      atDate: params.atDate,
+      code: retentionCode,
+    });
+
+    if (definition.isFailure) {
+      return Result.fail(definition.error);
+    }
+
+    if (definition.data.isNone()) {
+      return Result.fail(new Error(`Tax definition not found: ${retentionCode}`));
+    }
+
+    return Result.ok(Maybe.some(retentionCode));
+  }
+
+  private defaultRecForIva(ivaCode: string): string | null {
+    const defaults: Record<string, string> = {
+      iva_21: "rec_5_2",
+      iva_10: "rec_1_4",
+      iva_4: "rec_0_5",
+      iva_0: "rec_0",
+    };
+
+    return defaults[ivaCode] ?? null;
+  }
+
+  private maybeValue(value: Maybe<string> | string | null | undefined): string | null {
+    if (value === null || value === undefined) {
+      return null;
+    }
+
+    if (typeof value === "string") {
+      return value;
+    }
+
+    if (typeof value === "object" && "isSome" in value && typeof value.isSome === "function") {
+      return value.isSome() ? value.unwrap() : null;
+    }
+
+    return null;
+  }
 }

modules/customer-invoices/src/api/application/proformas/services/proforma-updater.ts

@@ -1,7 +1,12 @@
 import { DomainValidationError, type UniqueID, type UtcDate } from "@repo/rdx-ddd";
-import { Result } from "@repo/rdx-utils";
+import { Maybe, Result } from "@repo/rdx-utils";
 
-import type { Proforma, ProformaItemPatchProps, ProformaPatchProps } from "../../../domain";
+import {
+  ProformaTaxConfig,
+  type Proforma,
+  type ProformaItemPatchProps,
+  type ProformaPatchProps,
+} from "../../../domain";
 import type { ProformaPatchInputProps } from "../models";
 import type { IProformaRepository } from "../repositories";
 
@@ -72,6 +77,7 @@ export class ProformaUpdater implements IProformaUpdater {
     const resolvedPatch = await this.resolvePatchProps({
       companyId,
       currentInvoiceDate: proforma.invoiceDate,
+      currentTaxConfig: proforma.taxConfig,
       patch: patchProps,
       transaction,
     });
@@ -107,10 +113,11 @@ export class ProformaUpdater implements IProformaUpdater {
   private async resolvePatchProps(params: {
     companyId: UniqueID;
     currentInvoiceDate: UtcDate;
+    currentTaxConfig: Proforma["taxConfig"];
     patch: ProformaPatchInputProps;
     transaction: unknown;
   }): Promise<Result<ProformaPatchProps, Error>> {
-    const { patch, companyId, currentInvoiceDate, transaction } = params;
+    const { patch, companyId, currentInvoiceDate, transaction, currentTaxConfig } = params;
 
     if (patch.taxRegimeCode !== undefined) {
       const taxRegimeResult = await this.deps.taxResolver.ensureTaxRegimeByCode({
@@ -134,6 +141,17 @@ export class ProformaUpdater implements IProformaUpdater {
       }
     }
 
+    const taxConfigResult = await this.resolveTaxConfig({
+      companyId,
+      currentInvoiceDate,
+      currentTaxConfig,
+      patchTaxConfig: patch.taxConfig,
+    });
+
+    if (taxConfigResult.isFailure) {
+      return Result.fail(taxConfigResult.error);
+    }
+
     if (patch.targetInvoiceSeriesCode !== undefined) {
       const targetInvoiceSeriesValidationResult =
         await this.deps.targetInvoiceSeriesValidator.ensureValidIssuedInvoiceSeries({
@@ -148,10 +166,16 @@ export class ProformaUpdater implements IProformaUpdater {
     }
 
     if (patch.items === undefined) {
-      return Result.ok({
+      const resolvedPatch: ProformaPatchProps = {
         ...patch,
         series: patch.targetInvoiceSeriesCode,
-      } as ProformaPatchProps);
+      };
+
+      if (taxConfigResult.data !== undefined) {
+        resolvedPatch.taxConfig = taxConfigResult.data;
+      }
+
+      return Result.ok(resolvedPatch);
     }
 
     const effectiveInvoiceDate = patch.proformaDate ?? currentInvoiceDate;
@@ -174,11 +198,175 @@ export class ProformaUpdater implements IProformaUpdater {
       });
     }
 
-    return Result.ok({
+    const resolvedPatch: ProformaPatchProps = {
       ...patch,
       series: patch.targetInvoiceSeriesCode,
       items: resolvedItems,
+    };
+
+    if (taxConfigResult.data !== undefined) {
+      resolvedPatch.taxConfig = taxConfigResult.data;
+    }
+
+    return Result.ok(resolvedPatch);
+  }
+
+  private async resolveTaxConfig(params: {
+    companyId: UniqueID;
+    currentInvoiceDate: UtcDate;
+    currentTaxConfig: Proforma["taxConfig"];
+    patchTaxConfig: ProformaPatchInputProps["taxConfig"];
+  }): Promise<Result<ProformaTaxConfig | undefined, Error>> {
+    if (params.patchTaxConfig === undefined) {
+      return Result.ok(undefined);
+    }
+
+    const currentTaxConfig = params.currentTaxConfig;
+    const patchTaxConfig = params.patchTaxConfig;
+
+    const taxMode = patchTaxConfig.taxMode ?? currentTaxConfig.taxMode;
+    const defaultIvaCode = patchTaxConfig.defaultIvaCode ?? currentTaxConfig.defaultIvaCode;
+    const usesEquivalenceSurcharge =
+      patchTaxConfig.usesEquivalenceSurcharge ?? currentTaxConfig.usesEquivalenceSurcharge;
+    const usesRetention = patchTaxConfig.usesRetention ?? currentTaxConfig.usesRetention;
+
+    const defaultRecCode = await this.resolveDefaultRecCode({
+      companyId: params.companyId,
+      atDate: params.currentInvoiceDate,
+      defaultIvaCode,
+      usesEquivalenceSurcharge,
+      requestedCode: patchTaxConfig.defaultRecCode ?? currentTaxConfig.defaultRecCode,
     });
+
+    if (defaultRecCode.isFailure) {
+      return Result.fail(defaultRecCode.error);
+    }
+
+    const defaultRetentionCode = await this.resolveRetentionCode({
+      companyId: params.companyId,
+      atDate: params.currentInvoiceDate,
+      usesRetention,
+      requestedCode:
+        patchTaxConfig.defaultRetentionCode ?? currentTaxConfig.defaultRetentionCode,
+    });
+
+    if (defaultRetentionCode.isFailure) {
+      return Result.fail(defaultRetentionCode.error);
+    }
+
+    const taxConfigResult = ProformaTaxConfig.create({
+      taxMode,
+      defaultIvaCode,
+      usesEquivalenceSurcharge,
+      defaultRecCode: defaultRecCode.data,
+      usesRetention,
+      defaultRetentionCode: defaultRetentionCode.data,
+    });
+
+    if (taxConfigResult.isFailure) {
+      return Result.fail(taxConfigResult.error);
+    }
+
+    return Result.ok(taxConfigResult.data);
+  }
+
+  private async resolveDefaultRecCode(params: {
+    companyId: UniqueID;
+    atDate: UtcDate;
+    defaultIvaCode: Maybe<string>;
+    usesEquivalenceSurcharge: boolean;
+    requestedCode?: Maybe<string>;
+  }): Promise<Result<Maybe<string>, Error>> {
+    if (!params.usesEquivalenceSurcharge) {
+      return Result.ok(Maybe.none());
+    }
+
+    const ivaCode = this.maybeValue(params.defaultIvaCode);
+
+    if (!ivaCode) {
+      return Result.ok(Maybe.none());
+    }
+
+    const ivaDefinition = await this.deps.taxResolver.findActiveTaxDefinitionByCode({
+      companyId: params.companyId,
+      atDate: params.atDate,
+      code: ivaCode,
+    });
+
+    if (ivaDefinition.isFailure) {
+      return Result.fail(ivaDefinition.error);
+    }
+
+    if (ivaDefinition.data.isNone()) {
+      return Result.fail(new Error(`Tax definition not found: ${ivaCode}`));
+    }
+
+    const allowedSurchargeCodes = ivaDefinition.data.unwrap().allowedSurchargeCodes.getAll();
+    const requestedCode = this.maybeValue(params.requestedCode) ?? this.defaultRecForIva(ivaCode);
+
+    if (requestedCode && allowedSurchargeCodes.includes(requestedCode)) {
+      return Result.ok(Maybe.some(requestedCode));
+    }
+
+    const fallbackCode = allowedSurchargeCodes[0] ?? null;
+
+    return Result.ok(fallbackCode ? Maybe.some(fallbackCode) : Maybe.none());
+  }
+
+  private async resolveRetentionCode(params: {
+    companyId: UniqueID;
+    atDate: UtcDate;
+    usesRetention: boolean;
+    requestedCode?: Maybe<string>;
+  }): Promise<Result<Maybe<string>, Error>> {
+    if (!params.usesRetention) {
+      return Result.ok(Maybe.none());
+    }
+
+    const retentionCode = this.maybeValue(params.requestedCode) ?? "retention_15";
+
+    const definition = await this.deps.taxResolver.findActiveTaxDefinitionByCode({
+      companyId: params.companyId,
+      atDate: params.atDate,
+      code: retentionCode,
+    });
+
+    if (definition.isFailure) {
+      return Result.fail(definition.error);
+    }
+
+    if (definition.data.isNone()) {
+      return Result.fail(new Error(`Tax definition not found: ${retentionCode}`));
+    }
+
+    return Result.ok(Maybe.some(retentionCode));
+  }
+
+  private defaultRecForIva(ivaCode: string): string | null {
+    const defaults: Record<string, string> = {
+      iva_21: "rec_5_2",
+      iva_10: "rec_1_4",
+      iva_4: "rec_0_5",
+      iva_0: "rec_0",
+    };
+
+    return defaults[ivaCode] ?? null;
+  }
+
+  private maybeValue(value: Maybe<string> | string | null | undefined): string | null {
+    if (value === null || value === undefined) {
+      return null;
+    }
+
+    if (typeof value === "string") {
+      return value;
+    }
+
+    if (typeof value === "object" && "isSome" in value && typeof value.isSome === "function") {
+      return value.isSome() ? value.unwrap() : null;
+    }
+
+    return null;
   }
 
   private isApprovedPatchAllowed(patch: ProformaPatchInputProps): boolean {

modules/customer-invoices/src/api/application/proformas/snapshot-builders/full/proforma-full-snapshot-builder.ts

@@ -69,6 +69,17 @@ export class ProformaFullSnapshotBuilder implements IProformaFullSnapshotBuilder
       tax_regime: maybeToNullable(taxRegime, (taxRegime) => taxRegime),
 
       payment_term: null,
+      tax_config: {
+        tax_mode: proforma.taxConfig.taxMode === "perLine" ? "per_line" : "single",
+        default_iva_code: maybeToNullable(proforma.taxConfig.defaultIvaCode, (value) => value),
+        uses_equivalence_surcharge: proforma.taxConfig.usesEquivalenceSurcharge,
+        default_rec_code: maybeToNullable(proforma.taxConfig.defaultRecCode, (value) => value),
+        uses_retention: proforma.taxConfig.usesRetention,
+        default_retention_code: maybeToNullable(
+          proforma.taxConfig.defaultRetentionCode,
+          (value) => value
+        ),
+      },
 
       subtotal_amount: allTotals.subtotalAmount.toObjectString(),
       items_discount_amount: allTotals.itemsDiscountAmount.toObjectString(),

modules/customer-invoices/src/api/domain/proformas/aggregates/proforma.aggregate.ts

@@ -29,7 +29,7 @@ import {
 import { InvalidProformaTransitionError, ProformaItemMismatch } from "../errors";
 import type { IProformaTaxTotals, ProformaCalculationContext } from "../services";
 import { canManuallyTransitionProformaStatus } from "../services";
-import { ProformaItemTaxes, type ProformaRecipient } from "../value-objects";
+import { ProformaItemTaxes, ProformaTaxConfig, type ProformaRecipient } from "../value-objects";
 
 export interface IProformaCreateProps {
   companyId: UniqueID;
@@ -57,6 +57,7 @@ export interface IProformaCreateProps {
 
   paymentMethodId: Maybe<UniqueID>;
   taxRegimeCode: Maybe<string>;
+  taxConfig: ProformaTaxConfig;
 
   items: IProformaItemCreateProps[];
   globalDiscountPercentage: DiscountPercentage;
@@ -107,6 +108,7 @@ export interface IProforma {
 
   paymentMethodId: Maybe<UniqueID>;
   taxRegimeCode: Maybe<string>;
+  taxConfig: ProformaTaxConfig;
 
   linkedInvoiceId: Maybe<UniqueID>;
 
@@ -169,10 +171,13 @@ export class Proforma extends AggregateRoot<ProformaInternalProps> implements IP
   // Mutabilidad
   public update(patchProps: ProformaPatchProps): Result<Proforma, Error> {
     const { items, ...otherProps } = patchProps;
+    const definedProps = Object.fromEntries(
+      Object.entries(otherProps).filter(([, value]) => value !== undefined)
+    ) as Partial<ProformaInternalProps>;
 
     const candidateProps: ProformaInternalProps = {
       ...this.props,
-      ...otherProps,
+      ...definedProps,
     };
 
     // Validacciones
@@ -281,6 +286,10 @@ export class Proforma extends AggregateRoot<ProformaInternalProps> implements IP
     return this.props.taxRegimeCode;
   }
 
+  public get taxConfig(): ProformaTaxConfig {
+    return this.props.taxConfig;
+  }
+
   public get linkedInvoiceId(): Maybe<UniqueID> {
     return this.props.linkedInvoiceId;
   }

modules/customer-invoices/src/api/domain/proformas/value-objects/index.ts

@@ -1,2 +1,3 @@
 export * from "./proforma-item-taxes.vo";
 export * from "./proforma-recipient.vo";
+export * from "./proforma-tax-config.vo";

modules/customer-invoices/src/api/domain/proformas/value-objects/proforma-tax-config.vo.ts

@@ -0,0 +1,64 @@
+import { DomainValidationError } from "@repo/rdx-ddd";
+import { Maybe, Result } from "@repo/rdx-utils";
+
+export type ProformaTaxMode = "single" | "perLine";
+
+export interface ProformaTaxConfigProps {
+  taxMode: ProformaTaxMode;
+  defaultIvaCode: Maybe<string>;
+  usesEquivalenceSurcharge: boolean;
+  defaultRecCode: Maybe<string>;
+  usesRetention: boolean;
+  defaultRetentionCode: Maybe<string>;
+}
+
+export class ProformaTaxConfig {
+  private constructor(private readonly props: ProformaTaxConfigProps) {}
+
+  public static create(props: ProformaTaxConfigProps): Result<ProformaTaxConfig, Error> {
+    if (props.taxMode !== "single" && props.taxMode !== "perLine") {
+      return Result.fail(
+        new DomainValidationError("INVALID_TAX_MODE", "taxConfig.taxMode", "Invalid tax mode")
+      );
+    }
+
+    return Result.ok(
+      new ProformaTaxConfig({
+        taxMode: props.taxMode,
+        defaultIvaCode: props.defaultIvaCode,
+        usesEquivalenceSurcharge: props.usesEquivalenceSurcharge,
+        defaultRecCode: props.usesEquivalenceSurcharge ? props.defaultRecCode : Maybe.none(),
+        usesRetention: props.usesRetention,
+        defaultRetentionCode: props.usesRetention ? props.defaultRetentionCode : Maybe.none(),
+      })
+    );
+  }
+
+  public get taxMode(): ProformaTaxMode {
+    return this.props.taxMode;
+  }
+
+  public get defaultIvaCode(): Maybe<string> {
+    return this.props.defaultIvaCode;
+  }
+
+  public get usesEquivalenceSurcharge(): boolean {
+    return this.props.usesEquivalenceSurcharge;
+  }
+
+  public get defaultRecCode(): Maybe<string> {
+    return this.props.defaultRecCode;
+  }
+
+  public get usesRetention(): boolean {
+    return this.props.usesRetention;
+  }
+
+  public get defaultRetentionCode(): Maybe<string> {
+    return this.props.defaultRetentionCode;
+  }
+
+  public getProps(): ProformaTaxConfigProps {
+    return this.props;
+  }
+}

modules/customer-invoices/src/api/infrastructure/common/persistence/sequelize/models/sequelize-proforma.model.ts

@@ -53,6 +53,12 @@ export class ProformaModel extends Model<
   declare payment_term_id: CreationOptional<string | null>;
 
   declare tax_regime_code: CreationOptional<string | null>;
+  declare tax_mode: CreationOptional<string>;
+  declare default_iva_code: CreationOptional<string | null>;
+  declare uses_equivalence_surcharge: CreationOptional<boolean>;
+  declare default_rec_code: CreationOptional<string | null>;
+  declare uses_retention: CreationOptional<boolean>;
+  declare default_retention_code: CreationOptional<string | null>;
 
   declare subtotal_amount_value: number;
   declare subtotal_amount_scale: number;
@@ -249,6 +255,36 @@ export default (database: Sequelize) => {
         allowNull: true,
         defaultValue: null,
       },
+      tax_mode: {
+        type: DataTypes.STRING(16),
+        allowNull: false,
+        defaultValue: "single",
+      },
+      default_iva_code: {
+        type: DataTypes.STRING(32),
+        allowNull: true,
+        defaultValue: null,
+      },
+      uses_equivalence_surcharge: {
+        type: DataTypes.BOOLEAN,
+        allowNull: false,
+        defaultValue: false,
+      },
+      default_rec_code: {
+        type: DataTypes.STRING(32),
+        allowNull: true,
+        defaultValue: null,
+      },
+      uses_retention: {
+        type: DataTypes.BOOLEAN,
+        allowNull: false,
+        defaultValue: false,
+      },
+      default_retention_code: {
+        type: DataTypes.STRING(32),
+        allowNull: true,
+        defaultValue: null,
+      },
       subtotal_amount_value: {
         type: new DataTypes.BIGINT(),
         allowNull: false,

modules/customer-invoices/src/api/infrastructure/proformas/di/proforma-public-services.ts

@@ -1,4 +1,5 @@
 import type { SetupParams } from "@erp/core/api";
+import type { ICustomerPublicServices } from "@erp/customers/api";
 import type { DocumentSeriesPublicServicesType } from "@erp/document-series/api";
 import type { UniqueID } from "@repo/rdx-ddd";
 import { Result } from "@repo/rdx-utils";
@@ -51,6 +52,7 @@ export function buildProformaPublicServices(
   const { database } = params;
 
   const catalogs = resolveProformaCatalogsDeps(params);
+  const customerServices = params.getService<ICustomerPublicServices>("customers:general");
   const documentSeriesServices =
     params.getService<DocumentSeriesPublicServicesType>("document-series:general");
 
@@ -92,6 +94,7 @@ export function buildProformaPublicServices(
     paymentResolver: catalogResolvers.paymentResolver,
     proformaSeriesValidator,
     targetInvoiceSeriesValidator,
+    customerServices,
   });
 
   return {

modules/customer-invoices/src/api/infrastructure/proformas/di/proformas.di.ts

@@ -1,4 +1,5 @@
 import { type ModuleParams, buildTransactionManager } from "@erp/core/api";
+import type { ICustomerPublicServices } from "@erp/customers/api";
 import type { DocumentSeriesPublicServicesType } from "@erp/document-series/api";
 
 import type { ICompanyPublicServices } from "../../../../../../companies/src/api";
@@ -65,6 +66,7 @@ export function buildProformasDependencies(params: ModuleParams): ProformasInter
 
   const catalogs = resolveProformaCatalogsDeps(params);
   const companiesServices = params.getService<ICompanyPublicServices>("companies:general");
+  const customerServices = params.getService<ICustomerPublicServices>("customers:general");
   const documentSeriesServices =
     params.getService<DocumentSeriesPublicServicesType>("document-series:general");
 
@@ -109,6 +111,7 @@ export function buildProformasDependencies(params: ModuleParams): ProformasInter
     repository,
     proformaSeriesValidator,
     targetInvoiceSeriesValidator,
+    customerServices,
   });
 
   const updater = buildProformaUpdater({

modules/customer-invoices/src/api/infrastructure/proformas/persistence/sequelize/mappers/domain/sequelize-proforma-domain.mapper.ts

@@ -18,6 +18,7 @@ import {
   InvoiceSerie,
   InvoiceStatus,
   Proforma,
+  ProformaTaxConfig,
   type ProformaInternalProps,
   ProformaItems,
 } from "../../../../../../domain";
@@ -177,6 +178,25 @@ export class SequelizeProformaDomainMapper extends SequelizeDomainMapper<
       errors
     );
 
+    const taxConfig = extractOrPushError(
+      ProformaTaxConfig.create({
+        taxMode: raw.tax_mode === "per_line" ? "perLine" : "single",
+        defaultIvaCode: maybeFromNullableResult(raw.default_iva_code, (value) =>
+          Result.ok(String(value))
+        ),
+        usesEquivalenceSurcharge: Boolean(raw.uses_equivalence_surcharge),
+        defaultRecCode: maybeFromNullableResult(raw.default_rec_code, (value) =>
+          Result.ok(String(value))
+        ),
+        usesRetention: Boolean(raw.uses_retention),
+        defaultRetentionCode: maybeFromNullableResult(raw.default_retention_code, (value) =>
+          Result.ok(String(value))
+        ),
+      }),
+      "tax_config",
+      errors
+    );
+
     return {
       invoiceId,
       companyId,
@@ -193,6 +213,7 @@ export class SequelizeProformaDomainMapper extends SequelizeDomainMapper<
       currencyCode,
       paymentMethodId,
       taxRegimeCode,
+      taxConfig,
 
       globalDiscountPercentage,
       linkedInvoiceId,
@@ -265,6 +286,7 @@ export class SequelizeProformaDomainMapper extends SequelizeDomainMapper<
 
         paymentMethodId: attributes.paymentMethodId!,
         taxRegimeCode: attributes.taxRegimeCode!,
+        taxConfig: attributes.taxConfig!,
 
         linkedInvoiceId: attributes.linkedInvoiceId!, // El id de la factura emitida (linked_invoice) se asigna al hacer issue() desde la proforma, no viene en el modelo de persistencia.
       };
@@ -357,6 +379,12 @@ export class SequelizeProformaDomainMapper extends SequelizeDomainMapper<
 
       tax_regime_code: maybeToNullable(source.taxRegimeCode, (value) => value),
       tax_regime_description: null,
+      tax_mode: source.taxConfig.taxMode === "perLine" ? "per_line" : "single",
+      default_iva_code: maybeToNullable(source.taxConfig.defaultIvaCode, (value) => value),
+      uses_equivalence_surcharge: source.taxConfig.usesEquivalenceSurcharge,
+      default_rec_code: maybeToNullable(source.taxConfig.defaultRecCode, (value) => value),
+      uses_retention: source.taxConfig.usesRetention,
+      default_retention_code: maybeToNullable(source.taxConfig.defaultRetentionCode, (value) => value),
 
       subtotal_amount_value: allAmounts.subtotalAmount.value,
       subtotal_amount_scale: allAmounts.subtotalAmount.scale,

modules/customer-invoices/src/api/infrastructure/proformas/persistence/sequelize/mappers/domain/sequelize-proforma-v2-domain.mapper.ts

@@ -18,6 +18,7 @@ import {
   InvoiceSerie,
   InvoiceStatus,
   Proforma,
+  ProformaTaxConfig,
   type ProformaInternalProps,
   ProformaItems,
 } from "../../../../../../domain";
@@ -117,6 +118,30 @@ export class SequelizeProformaV2DomainMapper extends SequelizeDomainMapper<
       "tax_regime_code",
       errors
     );
+    const taxConfig = extractOrPushError(
+      ProformaTaxConfig.create({
+        taxMode: raw.tax_mode === "per_line" ? "perLine" : "single",
+        defaultIvaCode: extractOrPushError(
+          maybeFromNullableResult(raw.default_iva_code, (value) => Result.ok(String(value))),
+          "default_iva_code",
+          errors
+        )!,
+        usesEquivalenceSurcharge: Boolean(raw.uses_equivalence_surcharge),
+        defaultRecCode: extractOrPushError(
+          maybeFromNullableResult(raw.default_rec_code, (value) => Result.ok(String(value))),
+          "default_rec_code",
+          errors
+        )!,
+        usesRetention: Boolean(raw.uses_retention),
+        defaultRetentionCode: extractOrPushError(
+          maybeFromNullableResult(raw.default_retention_code, (value) => Result.ok(String(value))),
+          "default_retention_code",
+          errors
+        )!,
+      }),
+      "tax_config",
+      errors
+    );
     const globalDiscountPercentage = extractOrPushError(
       DiscountPercentage.create({
         value: Number(raw.global_discount_percentage_value ?? 0),
@@ -148,6 +173,7 @@ export class SequelizeProformaV2DomainMapper extends SequelizeDomainMapper<
       currencyCode,
       paymentMethodId,
       taxRegimeCode,
+      taxConfig,
       globalDiscountPercentage,
       linkedInvoiceId,
     };
@@ -201,6 +227,7 @@ export class SequelizeProformaV2DomainMapper extends SequelizeDomainMapper<
         globalDiscountPercentage: attributes.globalDiscountPercentage!,
         paymentMethodId: attributes.paymentMethodId!,
         taxRegimeCode: attributes.taxRegimeCode!,
+        taxConfig: attributes.taxConfig!,
         linkedInvoiceId: attributes.linkedInvoiceId!,
       };
 
@@ -264,6 +291,15 @@ export class SequelizeProformaV2DomainMapper extends SequelizeDomainMapper<
       payment_method_id: maybeToNullable(source.paymentMethodId, (value) => value.toPrimitive()),
       payment_term_id: null,
       tax_regime_code: maybeToNullable(source.taxRegimeCode, (value) => value),
+      tax_mode: source.taxConfig.taxMode === "perLine" ? "per_line" : "single",
+      default_iva_code: maybeToNullable(source.taxConfig.defaultIvaCode, (value) => value),
+      uses_equivalence_surcharge: source.taxConfig.usesEquivalenceSurcharge,
+      default_rec_code: maybeToNullable(source.taxConfig.defaultRecCode, (value) => value),
+      uses_retention: source.taxConfig.usesRetention,
+      default_retention_code: maybeToNullable(
+        source.taxConfig.defaultRetentionCode,
+        (value) => value
+      ),
 
       subtotal_amount_value: allAmounts.subtotalAmount.value,
       subtotal_amount_scale: allAmounts.subtotalAmount.scale,

modules/customer-invoices/src/common/dto/request/proformas/create-proforma.request.dto.ts

@@ -7,7 +7,7 @@ import {
 } from "@erp/core";
 import { z } from "zod/v4";
 
-import { ItemPositionSchema, TaxCombinationCodeSchema } from "../../shared";
+import { ItemPositionSchema, ProformaTaxConfigPatchSchema, TaxCombinationCodeSchema } from "../../shared";
 
 export const CreateProformaItemRequestSchema = z.object({
   position: ItemPositionSchema,
@@ -49,6 +49,7 @@ export const CreateProformaRequestSchema = z.object({
   payment_method_id: z.uuid().nullable().optional(),
   payment_term_id: z.uuid().nullable().optional(),
   tax_regime_code: z.string().nullable().optional(),
+  tax_config: ProformaTaxConfigPatchSchema.optional(),
 
   items: z.array(CreateProformaItemRequestSchema).optional(),
 });

modules/customer-invoices/src/common/dto/request/proformas/update-proforma-by-id.request.dto.ts

@@ -8,7 +8,7 @@ import {
 } from "@erp/core";
 import { z } from "zod/v4";
 
-import { ItemPositionSchema } from "../../shared";
+import { ItemPositionSchema, ProformaTaxConfigPatchSchema } from "../../shared";
 
 export const UpdateProformaItemRequestSchema = z.object({
   position: ItemPositionSchema,
@@ -54,6 +54,7 @@ export const UpdateProformaByIdRequestSchema = z.object({
   payment_method_id: z.uuid().nullable().optional(),
   payment_term_id: z.uuid().nullable().optional(),
   tax_regime_code: z.string().nullable().optional(),
+  tax_config: ProformaTaxConfigPatchSchema.optional(),
 
   // retención como código??? retencion_15
 

modules/customer-invoices/src/common/dto/response/proformas/get-proforma-by-id.response.dto.ts

@@ -11,6 +11,7 @@ import { z } from "zod/v4";
 import {
   PaymentMethodRefSchema,
   PaymentTermRefSchema,
+  ProformaTaxConfigSchema,
   TaxRegimeRefSchema,
   TaxesBreakdownSchema,
 } from "../../shared";
@@ -50,6 +51,7 @@ export const GetProformaByIdResponseSchema = z.object({
   payment_term: PaymentTermRefSchema.nullable(),
 
   tax_regime: TaxRegimeRefSchema.nullable(),
+  tax_config: ProformaTaxConfigSchema,
 
   subtotal_amount: MoneySchema,
   items_discount_amount: MoneySchema,

modules/customer-invoices/src/common/dto/shared/index.ts

@@ -3,6 +3,7 @@ export * from "./item-position.dto";
 export * from "./payment-method-ref.dto";
 export * from "./payment-term-ref.dto";
 export * from "./proforma";
+export * from "./proforma-tax-config.dto";
 export * from "./tax-combination-code.dto";
 export * from "./tax-regime-ref.dto";
 export * from "./taxes-breakdown.dto";

modules/customer-invoices/src/common/dto/shared/proforma-tax-config.dto.ts

@@ -0,0 +1,17 @@
+import { z } from "zod/v4";
+
+const ProformaTaxModeSchema = z.enum(["single", "per_line"]);
+
+export const ProformaTaxConfigSchema = z.object({
+  tax_mode: ProformaTaxModeSchema,
+  default_iva_code: z.string().nullable(),
+  uses_equivalence_surcharge: z.boolean(),
+  default_rec_code: z.string().nullable(),
+  uses_retention: z.boolean(),
+  default_retention_code: z.string().nullable(),
+});
+
+export const ProformaTaxConfigPatchSchema = ProformaTaxConfigSchema.partial();
+
+export type ProformaTaxConfigDTO = z.infer<typeof ProformaTaxConfigSchema>;
+export type ProformaTaxConfigPatchDTO = z.infer<typeof ProformaTaxConfigPatchSchema>;

modules/customer-invoices/src/web/proformas/shared/adapters/get-proforma-by-id.adapter.ts

@@ -42,6 +42,14 @@ export const GetProformaByIdAdapter = {
 
       customerId: dto.customer_id,
       recipient: mapRecipient(dto),
+      taxConfig: {
+        taxMode: dto.tax_config.tax_mode === "per_line" ? "perLine" : "single",
+        defaultIvaCode: dto.tax_config.default_iva_code,
+        usesEquivalenceSurcharge: dto.tax_config.uses_equivalence_surcharge,
+        defaultRecCode: dto.tax_config.default_rec_code,
+        usesRetention: dto.tax_config.uses_retention,
+        defaultRetentionCode: dto.tax_config.default_retention_code,
+      },
       taxes: dto.taxes.map(mapTaxSummary),
 
       paymentMethodId: dto.payment_method?.id ?? null,

modules/customer-invoices/src/web/proformas/shared/entities/proforma.entity.ts

@@ -3,6 +3,15 @@ import type { ProformaRecipient } from "./proforma-recipient.entity";
 import type { ProformaStatus } from "./proforma-status.entity";
 import type { ProformaTaxSummary } from "./proforma-tax-summary.entity";
 
+export interface ProformaTaxConfig {
+  taxMode: "single" | "perLine";
+  defaultIvaCode: string | null;
+  usesEquivalenceSurcharge: boolean;
+  defaultRecCode: string | null;
+  usesRetention: boolean;
+  defaultRetentionCode: string | null;
+}
+
 /**
  * Interface que representa una proforma en el sistema,
  * adaptada desde la respuesta de la API.
@@ -33,6 +42,7 @@ export interface Proforma {
   recipient: ProformaRecipient;
 
   taxRegimeCode: string | null;
+  taxConfig: ProformaTaxConfig;
   taxes: ProformaTaxSummary[];
 
   paymentMethodId: string | null;

modules/customer-invoices/src/web/proformas/shared/utils/proforma-fiscal-options.utils.ts

@@ -79,6 +79,30 @@ export const getProformaRecCode = (
   return definition?.recCode ?? null;
 };
 
+export const getProformaTaxPercentageFromCode = (taxCode: string | null | undefined): number | null => {
+  if (!taxCode) {
+    return null;
+  }
+
+  const definition = Object.values(PROFORMA_TAX_DEFINITIONS).find(
+    (candidate) => candidate.taxCode === taxCode
+  );
+
+  return definition?.taxPercentage ?? null;
+};
+
+export const getProformaRecPercentageFromCode = (recCode: string | null | undefined): number | null => {
+  if (!recCode) {
+    return null;
+  }
+
+  const definition = Object.values(PROFORMA_TAX_DEFINITIONS).find(
+    (candidate) => candidate.recCode === recCode
+  );
+
+  return definition?.recPercentage ?? null;
+};
+
 export const getProformaRetentionCode = (
   retentionPercentage: number | string | null | undefined
 ): string | null => {
@@ -89,6 +113,20 @@ export const getProformaRetentionCode = (
   return PROFORMA_RETENTION_DEFINITIONS[parsedRetentionPercentage].retentionCode;
 };
 
+export const getProformaRetentionPercentageFromCode = (
+  retentionCode: string | null | undefined
+): number | null => {
+  if (!retentionCode) {
+    return null;
+  }
+
+  const definition = Object.values(PROFORMA_RETENTION_DEFINITIONS).find(
+    (candidate) => candidate.retentionCode === retentionCode
+  );
+
+  return definition?.retentionPercentage ?? null;
+};
+
 export const getProformaTaxOptions = () => PROFORMA_TAX_OPTIONS;
 
 export const getProformaRecOptions = () => PROFORMA_REC_OPTIONS;

modules/customer-invoices/src/web/proformas/update/adapters/map-proforma-to-proforma-update-form.adapter.ts

@@ -1,4 +1,9 @@
 import type { Proforma } from "../../shared";
+import {
+  getProformaRecPercentageFromCode,
+  getProformaRetentionPercentageFromCode,
+  getProformaTaxPercentageFromCode,
+} from "../../shared";
 import type { ProformaTaxMode, ProformaUpdateForm } from "../entities";
 import { buildProformaUpdateDefault } from "../utils";
 
@@ -68,49 +73,19 @@ const resolveFiscalState = (
   proforma: Proforma,
   proformaDefaults: ProformaUpdateForm
 ): FiscalState => {
-  // Caso habitual: una sola combinación de impuestos
-  if (proforma.taxes.length === 1) {
-    const taxSummary = proforma.taxes[0];
-
-    const hasTaxPercentage = taxSummary.ivaCode !== null;
-    const hasRecPercentage = taxSummary.recCode !== null;
-    const hasRetentionPercentage = taxSummary.retentionCode !== null;
-
-    return {
-      taxMode: "single",
-      defaultTaxPercentage: hasTaxPercentage ? taxSummary.ivaPercentage : null,
-      defaultRecPercentage: hasRecPercentage ? taxSummary.recPercentage : null,
-      defaultRetentionPercentage: hasRetentionPercentage ? taxSummary.retentionPercentage : null,
-      hasTaxPercentage,
-      hasRecPercentage,
-      hasRetentionPercentage,
-    };
-  }
-
-  // Caso excepcional: proforma sin impuestos
-  if (proforma.taxes.length === 0) {
-    return {
-      taxMode: "single",
-      defaultTaxPercentage: null,
-      defaultRecPercentage: null,
-      defaultRetentionPercentage: null,
-      hasTaxPercentage: false,
-      hasRecPercentage: false,
-      hasRetentionPercentage: false,
-    };
-  }
-
-  // Proforma con varias combinaciones de impuestos
-  const taxSummary = proforma.taxes[0];
-  const hasRecPercentage = taxSummary.recCode !== null;
+  const defaultTaxPercentage = getProformaTaxPercentageFromCode(proforma.taxConfig.defaultIvaCode);
+  const defaultRecPercentage = getProformaRecPercentageFromCode(proforma.taxConfig.defaultRecCode);
+  const defaultRetentionPercentage = getProformaRetentionPercentageFromCode(
+    proforma.taxConfig.defaultRetentionCode
+  );
 
   return {
-    taxMode: "perLine",
-    defaultTaxPercentage: null,
-    defaultRecPercentage: hasRecPercentage ? taxSummary.recPercentage : null,
-    defaultRetentionPercentage: null,
-    hasTaxPercentage: false,
-    hasRecPercentage,
-    hasRetentionPercentage: false,
+    taxMode: proforma.taxConfig.taxMode ?? proformaDefaults.taxMode,
+    defaultTaxPercentage,
+    defaultRecPercentage,
+    defaultRetentionPercentage,
+    hasTaxPercentage: proforma.taxConfig.defaultIvaCode !== null,
+    hasRecPercentage: proforma.taxConfig.usesEquivalenceSurcharge,
+    hasRetentionPercentage: proforma.taxConfig.usesRetention,
   };
 };

modules/customer-invoices/src/web/proformas/update/utils/build-update-proforma-by-id-params.ts

@@ -95,6 +95,17 @@ export const buildUpdateProformaByIdParams = (
     );
   }
 
+  if (shouldSendTaxConfig(patch)) {
+    data.tax_config = {
+      tax_mode: formData.taxMode === "perLine" ? "per_line" : "single",
+      default_iva_code: resolveSingleIvaCode(formData),
+      uses_equivalence_surcharge: formData.hasRecPercentage,
+      default_rec_code: resolveSingleRecCode(formData),
+      uses_retention: formData.hasRetentionPercentage,
+      default_retention_code: resolveRetentionCode(formData),
+    };
+  }
+
   // Si se han tocado los detalles, se envían todos
   if (shouldReplaceItems(patch)) {
     const context = buildProformaItemUpdateDTOContext(formData);
@@ -158,6 +169,18 @@ const shouldReplaceItems = (patch: ProformaUpdatePatch): boolean => {
   );
 };
 
+const shouldSendTaxConfig = (patch: ProformaUpdatePatch): boolean => {
+  return (
+    ObjectHelper.hasOwn(patch, "taxMode") ||
+    ObjectHelper.hasOwn(patch, "hasTaxPercentage") ||
+    ObjectHelper.hasOwn(patch, "taxPercentage") ||
+    ObjectHelper.hasOwn(patch, "hasRecPercentage") ||
+    ObjectHelper.hasOwn(patch, "recPercentage") ||
+    ObjectHelper.hasOwn(patch, "hasRetentionPercentage") ||
+    ObjectHelper.hasOwn(patch, "retentionPercentage")
+  );
+};
+
 const resolveSingleIvaCode = (formData: ProformaUpdateForm): string | null => {
   if (!formData.hasTaxPercentage) {
     return null;