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 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.
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 for the month ended 5 October 2025.
19 October 2025 - CIS tax deducted for the month ended 5 October 2025 is payable by today.
31 October 2025 – Latest date you can file a paper version of your 2024-25 self-assessment tax return.
Newsletter
With our newsletter, you automatically receive our latest news per e-mail and get access to the archive including advanced search options!
Latest news
- What are the current Income Tax bands and allowances?
28/08/2025 - More...
Income Tax applies to earnings, pensions, savings, dividends and more, with different bands across the UK
- Corporation tax roadmap
28/08/2025 - More...
With a £50bn shortfall looming, the Chancellor may need to revisit last year’s Corporation Tax roadmap commitments. As
- MTD for IT taxpayer exemption
28/08/2025 - More...
From April 2026, the self-employed and landlords must use MTD for IT, but exemptions may apply in limited cases. If you