Guidance

Self Assessment technical specifications (2023) for individual returns

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

From:
HM Revenue & Customs
Published
20 January 2023
Last updated
5 January 2024 — See all updates

Documents

Self Assessment Individual RIM artefacts version 1.0

ZIP, 3.62 MB

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Tax and National Insurance contributions calculation version E ― version 2.1.1

ODT, 676 KB

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Stage 13 (Payments on Account) Tax and National Insurance contributions calculation version 1.0.0

ODT, 10.5 KB

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Test case generator version 2.1.2

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MTR mapping document version 1.1

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Special Cases Version 3.1

ODT, 56.6 KB

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Exclusion Cases Version 3.1

ODT, 57 KB

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Details

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

Updates to this page

Published 20 January 2023
Last updated 5 January 2024 + show all updates

  1. Special Cases Version 3.1 and Exclusion Cases Version 3.1 have been added.

  2. Exclusion Cases version 3.0a has been added.

  3. Special Cases version 3.0a document has been added.

  4. Special Cases and Exclusion Cases documents updated with new versions (2.0a).

  5. We have added special cases version 1.0a and exclusion cases version 1.0a.

  6. Special cases version 0.1a and exclusion cases version 0.1a have been added.

  7. First published.

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