Self Assessment Deadlines (filing and payment deadlines)

For the 2024/25 tax year (6 April 2024 – 5 April 2025), HMRC has strict deadlines:

Registration

• 5 October 2025 – Register for Self Assessment if filing for the first time.
• Late registration may trigger penalties even if you have no tax to pay.

Filing Deadlines

• 31 October 2025 – Paper tax returns.
• 31 January 2026 – Online tax returns.

Payment Deadlines

• 31 January 2026 – Pay 2024/25 tax
  If your tax bill is £1000 and above, HMRC will automatically put your account on a payment on account where you’ll be required to pay your current bill plus future bills in advance. You can request them to either remove this or reduce the payments in advance depending on your future earning patterns if they are going to reduce.