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Guide

Key deadlines

The UK tax year runs 6 April to 5 April. Most deadlines cluster around 31 January, 31 July, 5 October and 31 October.

Step by step

  1. 1Note the tax year you're filing for
  2. 2Register by 5 October if you're new
  3. 3File paper by 31 October or online by 31 January
  4. 4Pay balancing payment and first payment on account by 31 January
  5. 5Pay second payment on account by 31 July

Common mistakes

  • Confusing the tax year with the calendar year
  • Forgetting the 31 July payment
  • Assuming HMRC will remind you

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.