Tax Diary March/April 2026
Source: HM Revenue & Customs | | 11/02/20261 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 the same date.
19 March 2026 - PAYE and NIC deductions due for month ended 5 March 2026 (If you pay your tax electronically the due date is 22 March 2026).
19 March 2026 - Filing deadline for the CIS300 monthly return for the month ended 5 March 2026.
19 March 2026 - CIS tax deducted for the month ended 5 March 2026 is payable by today.
1 April 2026 - Due date for corporation tax due for the year ended 30 June 2025.
19 April 2026 - PAYE and NIC deductions due for month ended 5 April 2026. (If you pay your tax electronically the due date is 22 April 2026).
19 April 2026 - Filing deadline for the CIS300 monthly return for the month ended 5 April 2026.
19 April 2026 - CIS tax deducted for the month ended 5 April 2026 is payable by today.
30 April 2026 – 2024-25 tax returns filed after this date will be subject to an additional £10 per day late filing penalty for a maximum of 90 days.
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