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UK Tax Dates and Deadlines 2026/27

The key dates for employees, the self-employed and savers in the 2026/27 tax year, with a countdown for the big two.

Checked 8 October 2026 · dates from GOV.UK and HMRC

DateWhat happens
6 April 2026The 2026/27 tax year begins.
31 May 2026Employers must give employees a P60 for the year.
6 July 2026Deadline for employers to file P11D forms for benefits in kind.
31 July 2026Second payment on account for 2025/26 Self Assessment is due.
5 October 2026Deadline to register for Self Assessment for 2025/26 if you have not before.
31 October 2026Deadline for paper Self Assessment tax returns for 2025/26.
30 December 2026File your 2025/26 online return by this date if you want HMRC to collect small debts through your tax code.
31 January 2027Deadline for online Self Assessment returns for 2025/26, and to pay any tax owed, plus the first payment on account for 2026/27.
5 April 2027The 2026/27 tax year ends: use your ISA and pension allowances before this date.
6 April 2027The 2027/28 tax year begins.

Before the tax year ends

  • Use your ISA allowance (£20,000), because it does not carry over.
  • Check whether pension contributions can reduce a high-income Child Benefit charge, using the Child Benefit charge calculator.
  • Claim Marriage Allowance if you are eligible, which can be backdated.

Sources: GOV.UK Self Assessment deadlines and GOV.UK employer reporting. Dates can change; check GOV.UK before relying on them.

Frequently asked questions

When is the Self Assessment deadline for 2025/26?

31 January 2027 for online returns and payment. Paper returns are due by 31 October 2026.

When does the 2026/27 tax year end?

On 5 April 2027. The ISA allowance of £20,000 and any unused pension allowances must be used by then.

What is a payment on account?

Advance payments towards next year’s Self Assessment bill, usually due on 31 January and 31 July, each half of last year’s tax bill.

Figures are for the 2026/27 tax year from official sources and are estimates for guidance only, not financial or legal advice. Printed from ukanswers.co.uk.