---
title: "Acquire the additional tax liability by the license plate number (company car)"
method: GET
path: "/v2/rdwservices/additionaltaxliability"
tags: ["Fiscal company car"]
---

# Acquire the additional tax liability by the license plate number (company car)

`GET /v2/rdwservices/additionaltaxliability`

## Request

- Base URL: `https://api.loket.nl`
- URL: `https://api.loket.nl/v2/rdwservices/additionaltaxliability`
- Auth: none required

__Activity name:__ <a href="https://developer.loket.nl/Activities/GetAdditionalTaxliabilityByLicensePlateNumber" target="_blank">GetAdditionalTaxliabilityByLicensePlateNumber</a>

This endpoint allows the user to acquire values for specific properties in the company car resource. This endpoint will require a license plate number (vehicle registration number), and will return aggregated data based on its RDW-registration.

## Query parameters

- `licensePlateNumber` string, required

## Headers

- `Authorization` string, required
- `Accept` string, required

## Response `200`

OK

- object: a warning indacateds that the given payload is valide, however take notice of the warning this might ifluence behavour.
  - `version` Version
    - `obsoleteDate` string, date, nullable: The date (can be null) on which the `resourceVersion` is no longer supported/available
    - `resourceVersion` string, date: The resource version of the object in the response
  - `messages` object[]
    - `type` string: Indication of the type of message. See [the general documentation for more information](./#section/Response/Messages)
    - `description` string: Describes the message
    - `id` string, uuid, nullable: In some cases when the message may relate to a specific entity, or specific group of entities, this field provides the identifier of that entity
    - `code` integer: Identifying code for the message
    - `properties` string[]: An array that can contain additional information
  - `content` Additionaltaxliability, nullable
    - `licensePlateNumber` string: Vehicle registration (license plate of the vehicle). The number should be provided with or without any hyphens (-).
    - `dateOfFirstAdmission` string, date: First day of admission for the vehicle (datum eerste toelating).
    - `valueForTaxPurposes` number, double: The value of the vehicle for tax purposes. This field may only be NULL if a reason for no additional tax liability (reden voor geen bijtelling) is provided.
    - `additionalTaxLiabilityGroup` object, nullable: Indicates what additional tax liability percentage (bijtelling) should be used for calculating the tax liabiltiy in the payroll process.
      - `key` integer
      - `value` string

## Other responses

- `400`: Bad Request
- `401`: Unauthorized
- `403`: Forbidden
- `404`: Not Found
- `500`: Internal Server Error

## Changes

- **2026-11-10** `18447d65a986`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/loket-acc/apis/loket-api/changes/v2/rdwservices/additionaltaxliability/get.md)

---

[API](https://skmtc.dev/loket-acc/apis/loket-api.md) - [All operations](https://skmtc.dev/loket-acc/apis/loket-api/llms.txt) - [OpenAPI document](https://skmtc.dev/loket-acc/apis/loket-api/revisions/18447d65a986?raw)