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GET Get LossesReturns the losses and loss claims HMRC hold for the tax year, in whichever of their two shapes that year uses — isRecordBased says which. Empty lists.../tenants/{tenant}/clients/{client}/mtd/losses/{taxYear}
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POST Create Brought Forward LossRecords 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 repe.../tenants/{tenant}/clients/{client}/mtd/losses/brought-forward/{taxYear}
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POST Amend Brought Forward LossChanges a brought forward loss's amount — the only part HMRC let you change — and returns the loss as they now hold it. A POST rather than a PUT becau.../tenants/{tenant}/clients/{client}/mtd/losses/brought-forward/{lossId}/{taxYear}/amount
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DELETE Delete Brought Forward LossDeletes a brought forward loss. HMRC block this once the loss has been used in a final declaration — the way to take the figure out of the computation.../tenants/{tenant}/clients/{client}/mtd/losses/brought-forward/{lossId}/{taxYear}
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POST Create Loss ClaimClaims 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 per.../tenants/{tenant}/clients/{client}/mtd/losses/claims
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POST Amend Loss Claim TypeChanges a loss claim's type — the only part of a claim HMRC let you amend — and returns the claim as they now hold it. A POST for the same reason as t.../tenants/{tenant}/clients/{client}/mtd/losses/claims/{claimId}/{taxYear}/type
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DELETE Delete Loss ClaimDeletes a loss claim. Who deleted it is recorded./tenants/{tenant}/clients/{client}/mtd/losses/claims/{claimId}/{taxYear}
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PUT Amend Loss Claims OrderReplaces the order in which HMRC apply the year's carry-sideways loss claims. A full replacement: every carry-sideways claim for the year must be in t.../tenants/{tenant}/clients/{client}/mtd/losses/claims/{taxYear}/order
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PUT Save Losses And ClaimsSends one income source's whole losses-and-claims position for a tax year from 2026-27 onwards. A full replacement of what HMRC hold — anything omitte.../tenants/{tenant}/clients/{client}/mtd/losses/document/{businessId}/{taxYear}
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DELETE Delete Losses And ClaimsClears the losses and claims HMRC hold for one income source and tax year (2026-27 onwards). Clearing is a delete rather than an empty save. Who delet.../tenants/{tenant}/clients/{client}/mtd/losses/document/{businessId}/{taxYear}
