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Guide

Self Assessment deadline 2027

31 January 2027 is the online filing and payment deadline for the 2025/26 tax year, which ran from 6 April 2025 to 5 April 2026. It is not the deadline for the 2026/27 tax year.

Step by step

  1. 1The paper deadline for the 2025/26 return was 31 October 2026
  2. 2File the 2025/26 return online by 31 January 2027 and pay the balancing payment the same day
  3. 3The first payment on account for the following year is also due on 31 January 2027, if payments on account apply
  4. 4The 2026/27 tax year ends on 5 April 2027. File that return online, and pay, by 31 January 2028
  5. 5The 31 January 2027 return for 2025/26 gets the £100 late penalty for everyone. Penalty points apply from 2026/27 returns for people in MTD

Common questions

What is the Self Assessment deadline in 2027?

31 January 2027 is the deadline to file the 2025/26 return online and pay the tax due, including the first payment on account. The paper deadline for that year was 31 October 2026.

When is the 2026/27 tax return due?

The 2026/27 tax year ends on 5 April 2027. The online filing and payment deadline for that year is 31 January 2028, not January 2027.

Common mistakes

  • Treating 31 January 2027 as the deadline for the 2026/27 tax year
  • Paying late because the return was filed early
  • Forgetting the payment on account due the same day

Related guides

Last checked against GOV.UK: 28 October 2026. Tax year 2026/27.

Not affiliated with HMRC. General information, not professional tax advice. Check GOV.UK or speak to a qualified adviser for your situation.