Guidance

Self Assessment technical specifications for software developers (2018)

Use this guidance for support if you're a software developer working with the Self Assessment Online service.

Documents

Transaction Engine: support for software developers

HMRC(IR) mark: support for software developers

Acceptable characters version 1.0 (19 December 2017)

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Copy declaration version 1.0 (1 December 2017)

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Attachments recognition version 1.0 (13 February 2018)

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Details

These documents are technical specifications for software developers working with the Self Assessment Online service.

Published 15 January 2018
Last updated 6 September 2018 + show all updates
  1. Non form validation rule document updated.

  2. Attachments recognition version 1.0 has been added to the page.

  3. First published.