Tax Diary March/April 2026
1 March 2026 – Due date for Corporation Tax due for the year ended 31 May 2025.2 March 2026 – Self-Assessment tax for 2024-25 paid after this date will incur a 5% surcharge unless liabilities are cleared by 1 April 2026, or an agreement has been reached with HMRC under their time to pay facility by
Tax Diary February/March 2026
1 February 2026 – Due date for Corporation Tax payable for the year ended 30 April 2025.19 February 2026 – PAYE and NIC deductions due for month ended 5 February 2026. (If you pay your tax electronically the due date is 22 February 2026)19 February 2026 – Filing deadline for the CIS300 monthly
Tax Diary January/February 2026
1 January 2026 – Due date for Corporation Tax due for the year ended 31 March 202519 January 2026 – PAYE and NIC deductions due for month ended 5 January 2026. (If you pay your tax electronically the due date is 22 January 2026).19 January 2026 – Filing deadline for the CIS300 monthly return for the
Tax Diary December 2025/January 2026
1 December 2025 – Due date for Corporation Tax payable for the year ended 28 February 2025.
19 December 2025 – PAYE and NIC deductions due for month ended 5 December 2025. (If you pay your tax electronically the due date is 22 December 2025).
19 December 2025 – Filing deadline for the CIS300
Tax Diary November/December 2025
1 November 2025 – Due date for Corporation Tax due for the year ended 31 January 2025.
19 November 2025 – PAYE and NIC deductions due for month ended 5 November 2024. (If you pay your tax electronically the due date is 22 November 2025.)
19 November 2025 – Filing deadline for the CIS300 monthly
Tax Diary October/November 2025
1 October 2025 – Due date for Corporation Tax due for the year ended 31 December 2024.
19 October 2025 – PAYE and NIC deductions due for month ended 5 October 2025. (If you pay your tax electronically the due date is 22 October 2025.)
19 October 2025 – Filing deadline for the CIS300 monthly return
Tax Diary September/October 2025
1 September 2025 – Due date for corporation tax due for the year ended 30 November 2024.
19 September 2025 – PAYE and NIC deductions due for month ended 5 September 2025. (If you pay your tax electronically the due date is 22 September 2025)
19 September 2025 – Filing deadline for the CIS300
Tax Diary August/September 2025
1 August 2025 – Due date for corporation tax due for the year ended 31 October 2024.
19 August 2025 – PAYE and NIC deductions due for month ended 5 August 2025 (If you pay your tax electronically the due date is 22 August 2025)
19 August 2025 – Filing deadline for the CIS300 monthly return for the
Tax Diary July/August 2025
1 July 2025 – Due date for corporation tax due for the year ended 30 September 2024.
6 July 2025 – Complete and submit forms P11D return of benefits and expenses and P11D(b) return of Class 1A NICs.
19 July 2025 – Pay Class 1A NICs (by the 22 July 2025 if paid electronically).
19 July 2025 – PAYE
Tax Diary June/July 2025
1 June 2025 – Due date for corporation tax due for the year ended 31 August 2024.
19 June 2025 – PAYE and NIC deductions due for month ended 5 June 2025. (If you pay your tax electronically the due date is 22 June 2025).
19 June 2025 – Filing deadline for the CIS300 monthly return for the month