---
title: "Customise an employee self service wage projection"
method: POST
path: "/v2/providers/employers/employees/employments/{employmentId}/ess/wageprojection/customise"
tags: ["Employee self service wage projection"]
---

# Customise an employee self service wage projection

`POST /v2/providers/employers/employees/employments/{employmentId}/ess/wageprojection/customise`

## Request

- Base URL: `https://api.loket.nl`
- URL: `https://api.loket.nl/v2/providers/employers/employees/employments/{employmentId}/ess/wageprojection/customise`
- Auth: none required

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

This endpoint customises an employee self service wage projection for an existing employment.

## Path parameters

- `employmentId` string, uuid, required

## Headers

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

## Request body

- WageProjectionCustomiseInput
  - `currentHoursPerWeek` number, nullable
  - `deviations` object, nullable: When provided, at least one of `grossWageChangePercentage` or `hoursPerWeek` must have a value.
    - `grossWageChangePercentage` number, nullable
    - `hoursPerWeek` number, nullable
  - `calculateUsingNextYearsValues` boolean, nullable: If true, projection uses next year's tax and wage values.

## 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` WageProjectionComparisonResult
    - `netWagePerPeriod` WageProjectionPerInterval
      - `current` number
      - `afterChange` number
    - `grossWagePerYear` WageProjectionPerInterval
      - `current` number
      - `afterChange` number

## Other responses

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

## Changes

- **2026-07-31** `32d1693f8db8`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/loket/apis/loket-api/changes/v2/providers/employers/employees/employments/:employmentId/ess/wageprojection/customise/post.md)

---

[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)