Final declaration

Plain English, for UK sole traders. Verified against HMRC primary sources on 20 July 2026. Sources checked daily; last check 22 August 2026.

The year-end step under Making Tax Digital: after the four quarterly updates, you complete your tax return in your software, add any other income like savings interest or dividends, declare it's correct and complete, and submit by 31 January.

The name comes from HMRC's own technical documentation, and it's what accountants say. gov.uk's guidance for taxpayers doesn't use it: there the step is simply submitting your tax return. Older articles say "crystallisation", a name HMRC retired in March 2024. Whatever the label, it's one step, once a year, and it replaces the separate Self Assessment return for people in MTD. The full walkthrough: do you still do a tax return under MTD?

Compliance first.Every figure verified verbatim against HMRC primary sources, with the date on the page

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