1 September 2026 – Due date for corporation tax due for the year ended 30 November 2025.
19 September 2026 – PAYE and NIC deductions due for month ended 5 September 2026. (If you pay your tax electronically the due date is 22 September 2026)
19 September 2026 – Filing deadline for the CIS300 monthly return for the month ended 5 September 2026.
19 September 2026 – CIS tax deducted for the month ended 5 September 2026 is payable by today.
1 October 2026 – Due date for Corporation Tax due for the year ended 31 December 2025.
19 October 2026 – PAYE and NIC deductions due for month ended 5 October 2026. (If you pay your tax electronically the due date is 22 October 2026)
19 October 2026 – Filing deadline for the CIS monthly return for the month ended 5 October 2026.
19 October 2026 – CIS tax deducted for the month ended 5 October 2026 is payable by today.
31 October 2026 – Latest date you can file a paper version of your 2025-26 self-assessment tax return.
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