Original document : https://www.gov.uk/government/publications/self-assessment-technical-specifications-2025-for-individual-returns

Change description : 2025-02-21 14:47:00: The attachments ‘Calculate Tax and NIC MTR version 2.3.0a’ and ‘Test Case generator (Tester) MTR version version 2.3.0’ has been added. [Guidance and regulation]

Showing diff : 2025-01-31 10:21:53.800223877 +00:00..2025-02-21 14:47:08.169542993 +00:00

Guidance

Self Assessment technical specifications (2025) 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
22 October 2024
Last updated
3121 JanuaryFebruary 2025 — See all updates

Documents

Self Assessment Individual RIM Artefacts version 1.0

ZIP, 4.81 MB

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Calculate Tax and NIC MTR version 2.3.0a

ODT, 557 KB

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Calculate Tax and NIC MTR version 2.3.1a — Annex C

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Payments on Account (Stage 13) Tax and NIC calculation version 1.0.0a

ODT, 8.34 KB

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Test Case generator (Tester) MTR version 2.3.0

3.54 MB

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Test Case Generator (Tester) MTR version 1.3.02.3.1

3.57 MB

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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.

Updates to this page

Published 22 October 2024
Last updated 3121 JanuaryFebruary 2025 + show all updates

  1. The attachments 'Calculate Tax and NIC MTR version 2.3.0a' and 'Test Case generator (Tester) MTR version version 2.3.0' has been added.

  2. The attachments 'Calculate Tax and NIC MTR version 2.3.1a', 'Payments on Account (Stage 13) Tax and NIC calculation version 1.0.0a' and 'Test Case Generator (Tester) MTR version 1.3.0' have been added.

  3. First published.

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Update history

2025-02-21 14:47
The attachments ‘Calculate Tax and NIC MTR version 2.3.0a’ and ‘Test Case generator (Tester) MTR version version 2.3.0’ has been added.

2025-01-31 10:21
The attachments ‘Calculate Tax and NIC MTR version 2.3.1a’, ‘Payments on Account (Stage 13) Tax and NIC calculation version 1.0.0a’ and ‘Test Case Generator (Tester) MTR version 1.3.0’ have been added.

2024-10-22 14:17
First published.