Guidance

Self Assessment technical specifications (2019) 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: 13 December 2018
• Last updated: 17 December 2019 — See all updates

Documents

Self Assessment Individual RIM artefacts version 1.1 (16 January 2019)

ZIP, 3.76 MB

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Tax and National Insurance contributions calculation version E2.3.1 (15 November 2018)

ZIP, 191 KB

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Stage 13 (Payments on Account) Tax and National Insurance contributions calculation version 1.0 (18 September 2018)

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Test case generator version E2.3.1 (22 November 2018)

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MTR mapping document version 1.0 (06 November 2018)

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Exclusion cases version 3.0 (13 December 2019)

PDF, 281 KB, 12 pages

Special cases version 4.0 (13 December 2019)

PDF, 135 KB, 8 pages

Recognition process version 1.0 (18 February 2019)

PDF, 207 KB, 1 page

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Details

Individual returns technical specifications for software developers working with the Self Assessment Online service.

Published 13 December 2018
Last updated 17 December 2019 + show all updates

1. 17 December 2019

   Exclusion cases version 2.0 (4 October 2019) has been replaced with Exclusion cases version 3.0 (13 December 2019) and Special cases version 3.0 (4 October 2019) has been replaced with Special cases version 4.0 (13 December 2019).

2. 28 October 2019

   Exclusion cases version 1.1 (24 May 2019) has been replaced with Exclusion cases version 2.0 (4 October 2019) and Special cases version 2.0 (24 May 2019) has been replaced with Special cases version 3.0 (4 October 2019)’.

3. 31 May 2019

   Exclusion cases version 1.0 (25 April 2019) replaced with Exclusion cases version 1.1 (24 May 2019) and Special cases version 1.0 (6 March 2019)’ replaced with Special cases version 2.0 (24 May 2019).

4. 7 May 2019

   Special cases version 1.0 (6 March 2019) has been added.

5. 26 April 2019

   Exclusion cases version 1.0 (25 April 2019) has been added.

6. 11 March 2019

   Recognition process version 1.0 (18 February 2019) added.

7. 18 January 2019

   Self Assessment Individual RIM artefacts version 1.0 (01 October 2018) has been replaced with Self Assessment Individual RIM artefacts version 1.1 (16 January 2019).

8. 13 December 2018

   First published.