Self Assessment deadlines calendar
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Sources. GOV.UK: deadlines and payments on account. Last verified 17 October 2026. Dates are for the 2025-26 return unless marked.
The 31 January 2028 date is the usual pattern, not yet confirmed by GOV.UK. Reminder times depend on your calendar app (all-day events). If HMRC gave you a different filing deadline (for example you registered after 5 October 2026), edit the event; payment is still due 31 January 2027. See this guide.
The second payment on account (50%) is only relevant if you make payments on account; see our explainer. Weekends and bank holidays: money must reach HMRC by the deadline, so allow time for your payment method.
Not tax advice. Check dates on GOV.UK.