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Tax Calendar – 2025/26

PAYE Key Tax Dates
Deadline
End of the 2024/25 tax year and deadline for claiming PAYE tax refund for 2020/21
5 April 2025
First day of the 2025/26 tax year
6 April 2025
Issue P60 forms to employees for the 2024/25 tax year
31 May 2025
Issue P11D forms and agree any PAYE Settlement Agreements for 2024/25
6 July 2025
Self-Assessment Key Tax Dates
Deadline
Online filing deadline for 2023/24 tax return
31 January 2025
Deadline for paying 2023/24 balancing payment and 1st payment on account for 2024/25
31 January 2025
Deadline for claiming tax overpaid under Self-Assessment for 2020/21
5 April 2025
First day of the 2025/26 tax year
6 April 2025
Deadline for 2nd payment on account for tax year ending 5 April 2025
31 July 2025
Deadline to register for Self-Assessment if self-employed or receiving property income (submit CWF1 or SA1)
5 October 2025
Deadline for paper Self-Assessment tax returns for the 2024/25 tax year
31 October 2025
Deadline to submit online 2024/25 return if you want unpaid tax (under £3,000) collected through PAYE
30 December 2025
Online filing deadline and tax payment due date for 2024/25 Self-Assessment return
31 January 2026
End of the 2025/26 tax year
5 April 2026

Important Notes:

  1. Submit online by 30 December if you want HMRC to collect underpaid tax via PAYE tax code (if less than £3,000 is owed).
  2. Non-resident companies and pension scheme trustees must use paper returns by 31 January. Online submissions are not allowed for these entities.