Guidance

Self Assessment technical specifications (2026) for partnership returns

Use this technical documentation for partnership returns if you’re a software developer working with the Self Assessment online service.

From:
HM Revenue & Customs
Published
30 December 2025
Last updated
30 March 2026 — See all updates

Documents

Self Assessment Partnership RIM Artefacts version 1.0

ZIP, 1.2 MB

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Partnership Special Exclusion version 1.0

ODT, 32.4 KB

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Details

Partnership returns technical specifications for software developers working with the Self Assessment online service.

Updates to this page

Published 30 December 2025
Last updated 30 March 2026 href="#full-history">+ show all updates

  1. A new attachment 'Partnership Special Exclusion version 1.0’ has been added.

  2. First published.

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