---
title: "Initiate a UPA pension declaration"
method: POST
path: "/v2/providers/employers/payrolladministrations/{payrollAdministrationId}/externalparties/{externalPartyKey}/upapensiondeclarations/initiate"
tags: ["Upa pension declaration"]
---

# Initiate a UPA pension declaration

`POST /v2/providers/employers/payrolladministrations/{payrollAdministrationId}/externalparties/{externalPartyKey}/upapensiondeclarations/initiate`

## Request

- Base URL: `https://api.loket.nl`
- URL: `https://api.loket.nl/v2/providers/employers/payrolladministrations/{payrollAdministrationId}/externalparties/{externalPartyKey}/upapensiondeclarations/initiate`
- Auth: none required

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

Initiate the pension declaration for the next available period for the payrolladministration. Information about the next available periode can be obtained using the defaults endpoint (/defaults) 

* Defaults endpoint can be accessed at the path `.../payrolladministrations/{payrollAdministrationId}/externalparties/{externalPartyKey}/upapensiondeclarations/initiate/defaults`.

## Path parameters

- `payrollAdministrationId` string, uuid, required
- `externalPartyKey` integer, required

## Headers

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

## Request body

- InitiationParametersPensionDeclaration
  - `payrollPeriod` object
    - `year` integer: The year of the payroll period the request relates to
    - `periodNumber` integer: The period number of the payroll period the request relates to

## Response `201`

Created

- 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` InitiatedUpaPensionDeclaration
    - `id` string, uuid: The unique identifier of an object (GUID/UUID)

## Other responses

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

---

[API](https://skmtc.dev/loket/apis/loket-api.md) - [All operations](https://skmtc.dev/loket/apis/loket-api/llms.txt) - [OpenAPI document](https://skmtc.dev/loket/apis/loket-api/revisions/32170564148f?raw)