Guidance

Self Assessment technical specifications (2024) 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 October 2023
Last updated
22 April 2024 — See all updates

Documents

Self Assessment Individual RIM artefacts version 1.0

ZIP, 4.73 MB

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Tax and NIC calculation version 2.0.0a

ODT, 536 KB

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

ODT, 10.7 KB

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MTR Test Case Generator (Tester) version 2.0.1

3.54 MB

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MTR Mapping version 1.0

ZIP, 23.1 KB

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Special cases version 1.0a

ODT, 57 KB

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Exclusion cases version 1.0a

ODT, 41.3 KB

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Details

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

Published 20 October 2023
Last updated 22 April 2024 + show all updates

  1. Special cases version 1.0a has replaced Special cases version 0.1a. Exclusion cases version 1.0a has replaced Exclusion cases version 0.1a.

  2. MTR Test Case Generator (Tester) version 2.0.0 has replaced MTR Test Case Generator (Tester) version 2.0.1.

  3. Self Assessment technical specifications 'Special cases version 0.1a' and 'Exclusion cases version 0.1a' have been added.

  4. Tax and NIC calculation version 2.0.0a has replaced Tax and NIC calculation version 1.4.0a and MTR Test Case Generator (Tester) version 2.0.0 has replaced MTR Test Case Generator (Tester) version 1.4.1.

  5. MTR Test Case Generator (Tester) version 1.4.1 has replaced MTR Test Case Generator (Tester) version 1.4.0.

  6. Tax and NIC calculation version 1.4.0a and MTR Test Case Generator (Tester) version 1.4.0 have been updated. MTR Mapping version 1.0 has been added to the page.

  7. First published.

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