At a glance
You can submit your tax return from 6 April after the tax year ends. The deadline is usually 31 January after that.
For the 2026 to 2027 tax year: submit from 6 April 2027, deadline 31 January 2028.
Year-end process
- 1Final quarterly update sent
- 2Year-end adjustments made
- 3Other income and gains checked
- 4Calculation reviewed
- 5Tax return submitted
- 6Confirmation received
This follows HMRC's year-end order: quarterly updates, adjustments, other income, review, then submit.
Year-end checklist
Tick each step when it is complete. Only submit your tax return when all four are done.
Follow the steps above, then read on for adjustments, other income, and amendments.
Related: Quarterly updates · Digital records
How the final declaration works
What submitting your tax return involves, what must be in place first, and what happens when you confirm and send your return.
Accounting adjustments and timing
Which changes belong at year-end rather than in quarterly updates, including allowances, capital allowances, and accounting timing.
Reporting additional income
What HMRC often adds for you, what you still need to add yourself, and common areas people miss.
Amending a submitted return
How to fix mistakes after submission, the normal amendment window, and what to do if that window has passed.