Tax Diary August/September 2025
Source: HM Revenue & Customs | | 09/07/20251 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 month ended 5 August 2025.
19 August 2025 - CIS tax deducted for the month ended 5 August 2025 is payable by today.
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 monthly return for the month ended 5 September 2025.
19 September 2025 - CIS tax deducted for the month ended 5 September 2025 is payable by today.
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