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.

• From: HM Revenue & Customs
• Published: 20 January 2023

Documents

Transaction Engine: support for software developers

https://www.gov.uk/government/collections/government-gateway-support-for-software-developers

How to use the test service version 1.1

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Non form validation rules version 1.1

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HMRC(IR)mark: support for software developers

https://www.gov.uk/government/collections/hmrcirmark-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.

Published 20 January 2023