VERIFIED OFFICIAL SOURCE

GOV.UK - Complete your Self Assessment tax return for the last tax year

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Used by1 published procedure

Last checked2026-09-09

Source domaingov.uk

Official source URLhttps://www.gov.uk/guidance/how-to-complete-your-self-assessment-tax-return-for-last-tax-year

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GBUnited Kingdom

How to File Your 2025 to 2026 Self Assessment Tax Return Online With HMRC

File your UK Self Assessment tax return online with HMRC for the 2025 to 2026 tax year, including registration, records, deadlines, payment and late filing penalties.

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Rules, fees, forms and processing routes can change. Helpydo connects procedural guidance to the responsible authority so you can verify time-sensitive details before acting.