Guidance

Self Assessment technical specifications (2019): individual returns

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

Documents

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

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

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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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Recognition process version 1.0 (18 February 2019)

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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 7 May 2019 + show all updates
  1. Special cases version 1.0 (6 March 2019) has been added.
  2. Exclusion cases version 1.0 (25 April 2019) has been added.
  3. Recognition process version 1.0 (18 February 2019) added.
  4. 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).
  5. First published.