Deadline for online submission of Self Assessment tax returns for year ending 5 April 2026 for HMRC to collect employment or pension income tax through PAYE tax codes if less than tax codes if less than £3,000 is owed. 30 December 2026
Deadline for online Self Assessment tax returns for 2024/25 tax year. 31 January 2026
Deadline for paying tax bill for tax year ending 5 April 2024/25. 31 January 2026
Deadline for 1st payment on account for tax year 2025/26. 31 January 2026 (midnight)
Deadline for claiming tax overpaid for the 2021/22 tax year under self-assessment. 5 April 2026
6 April 2026 – First day of the new tax year 2026/27.
Deadline for 2nd payment on account for income tax year ending 5 April 2026. 31 July 2026
Deadline to register with the HMRC if you became self-employed or started receiving income from property. You should submit a form CWF1 for self-employment or form SA1 for non-self-employed income to HMRC. 5 October 2026
Deadline for paper Self Assessment returns for 2025/26 tax year. 31 October 2026 (midnight)
Deadline for online submission of self-assessment tax returns for year ending 5 April 2026 for HMRC to collect employment or pension income tax through PAYE tax codes if less than tax codes if less than £3,000 is owed. 30 December 2026
Deadline for online self-assessment tax returns for 2025/26 tax year 31 January 2027
Deadline for paying tax bill for tax year ending 5 April 2024/25. 31 January 2026 (midnight)
End of tax year 2026/27 5 April 2027
PAYE Key Tax Dates
Deadlines
End of the last tax year and deadline for claiming your PAYE tax refund for the 2021/22 tax year. 5 April 2026
First day of the new tax year 2026/27 , 6 April 2026
Copies of 2025/26 P60 documents issued to employees. 31 May 2026
Copies of 2025/26 P11D documents issued to employees. 6 July 2026