Guidance

Self Assessment technical specifications for software developers

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

How to use the test service version 1.1

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If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email different.format@hmrc.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Non form validation rules version 1.1

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HMRC(IR)mark: support for software developers

Accessible characters version 1.0a

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Copy declaration version 1.0a

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Details

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

Updates to this page

Published 20 January 2023

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