---
title: "Calculate totals for a set of lines"
method: POST
path: "/companies/{company}/taxes/calculate-totals"
tags: ["Taxes"]
---

# Calculate totals for a set of lines

`POST /companies/{company}/taxes/calculate-totals`

## Request

- Base URL: `https://api.factuarea.com/v1`
- URL: `https://api.factuarea.com/v1/companies/{company}/taxes/calculate-totals`
- Auth: one of:
  - HTTP bearer
  - API key in header `X-API-Key`

Compute subtotal, VAT, surcharge, retention and grand total for an array of line items with quantity, price, discount and tax rates. Returns the document totals plus the per-line breakdown.

## Path parameters

- `company` string, uuid, required

## Headers

- `Factuarea-Version` string, date

## Request body

- CalculateTotalsRequest: Calculate the totals of a set of lines. Body: `lines[]`, each with `quantity`, `unit_price` and the optional `discount`, `vat_rate`, `retention_rate` and `surcharge_rate`. Returns the subtotal, VAT, surcharge, withholding and total. `price` is accepted as a legacy alias of `unit_price`.
  - `lines` object[], required
    - `quantity` number, required
    - `unit_price` number, required
    - `discount` number, nullable
    - `vat_rate` number, nullable
    - `retention_rate` number, nullable
    - `surcharge_rate` number, nullable

## Response `200`

- object
  - `data` TaxTotals, required: Aggregated totals of a set of lines. Returned by `POST /v1/companies/{company}/taxes/calculate-totals`. Total formula: `subtotal + total_vat + total_surcharge − total_retention`.
    - `subtotal` string, required: Sum of the taxable bases of all lines (EUR), as a 2-decimal string.
    - `total_vat` string, required: Sum of the VAT of all lines, as a 2-decimal string.
    - `total_surcharge` string, required: Sum of the equivalence surcharge of all lines, as a 2-decimal string.
    - `total_retention` string, required: Sum of the withholding (IRPF) of all lines, as a 2-decimal string.
    - `total` string, required: Grand total, as a 2-decimal string.
    - `lines` TaxTotalsLine[], required: Calculated breakdown for each received line, in the same order.
      - `subtotal` string, required: Taxable base of the line (quantity × price − discount), as a 2-decimal string.
      - `vat_amount` string, required: VAT amount of the line, as a 2-decimal string.
      - `surcharge_amount` string, required: Equivalence surcharge amount of the line, as a 2-decimal string.
      - `retention_amount` string, required: Withholding (IRPF) amount of the line, as a 2-decimal string.
      - `total` string, required: Total of the line (subtotal + vat + surcharge − retention), as a 2-decimal string.

## Other responses

- `400`: `parameter_unknown` with `subcode` `retired_active_profile_header`: the retired `X-Active-Profile` header was sent; the company goes in the path. `parameter_invalid_format` on `Factuarea-Version`: the header is not a `YYYY-MM-DD` date. `unsupported_api_version`: the `Factuarea-Version` date is not a supported version.
- `401`: Missing or invalid API key.
- `403`: The request is authenticated but not allowed: the API key lacks the required scope (`insufficient_scope`), the plan does not include the public API or this feature (`addon_not_active`, `feature_not_available_in_plan`), or the module is not available with a test key (`module_not_available_in_sandbox`).
- `404`: The requested resource does not exist or belongs to another company. `profile_not_found`: the company in the path does not exist, is not in the API key scope or belongs to the other environment (live or test).
- `422`: Validation failed. The `error.param` field identifies which input is invalid.
- `429`: Rate limit exceeded. Retry after the duration in `Retry-After`.
- `500`: Unexpected server error.

---

[API](https://skmtc.dev/factuarea/apis/factuarea-public-api.md) · [All operations](https://skmtc.dev/factuarea/apis/factuarea-public-api/llms.txt) · [OpenAPI document](https://skmtc.dev/factuarea/apis/factuarea-public-api/revisions/718e77934422?raw)