Create Brought Forward Loss

POST /tenants/{tenant}/clients/{client}/mtd/losses/brought-forward/{taxYear}

Records a loss carried forward from a year before Making Tax Digital and returns HMRC's identifier for it. Tax years to 2025-26 only. Not safe to repeat: a second call either creates a duplicate loss or is refused as one. The year the loss arose in must have ended, and the claim types available later depend on the type of loss chosen here.

Parameters

Name	Type	Description
tenant*	path string	The Tenant.Code
The Tenant.Code
client*	path string
taxYear*	path string

Request Body*

CreateMtdBroughtForwardLossRequest

{
  "businessId": "string",
  "typeOfLoss": "Unknown",
  "lossAmount": 0
}

Responses

200 OK

MtdLossCreatedDto

400 Bad Request

401 Unauthorized – Invalid or missing API key

404 Not Found