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Self Assessment Tax Return Deadline 2025/26

Online Self Assessment tax return deadline for 2025/26 tax year

113 days left
Deadline
Sunday, 31 January 2027

Who This Applies To

  • Self-employed
  • Company directors
  • Landlords
  • Those with untaxed income

What to File

SA100 tax return plus any supplementary pages (employment, self-employment, dividends, capital gains)

How to File

HMRC online, commercial software, or through accountant

Payment Due

Same day - 31 January 2027

Penalties for Missing This Deadline

£100 immediate fine, then daily penalties after 3 months, then percentage of tax owed after 6/12 months

Tax Year: 2025/26

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