Create Loss Claim

POST /tenants/{tenant}/clients/{client}/mtd/losses/claims

Claims a loss and returns HMRC's identifier for the claim. Tax years to 2025-26 only, and HMRC accept nothing until the income source's accounting period has ended. The claim type must be legal for the type of loss: a sole trade is carried forward or set sideways, a property business takes the other three.

Parameters

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

Request Body*

CreateMtdLossClaimRequest

{
  "businessId": "string",
  "taxYearClaimedFor": "string",
  "typeOfLoss": "Unknown",
  "typeOfClaim": "Unknown"
}

Responses

200 OK

MtdLossCreatedDto

400 Bad Request

401 Unauthorized – Invalid or missing API key

404 Not Found