Tax Diary April/May 2026
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.1...