Tax & allowances

Income tax, National Insurance, tax codes, allowances and reliefs

What's changingTax & allowances25 Oct
Paper tax returns are due by 31 October. The three Self Assessment dates that follow
If you file your 2025 to 2026 tax return on paper, HMRC must have it by 11:59pm on Saturday 31 October. Online filers have until 31 January 2027, with an earlier date if you want to pay through your tax code.
What it's worth: Avoid a £100 late-filing penalty