Tax Diary January/February 2026
1 January 2026 - Due date for Corporation Tax due for the year ended 31 March 202519 January 2026 - PAYE and NIC deductions due for month ended 5 January 2026. (If you pay your tax electronically the due date is 22 January 2026).19 January 2026 - Filing deadline for the CIS300 monthly return for the month ended 5 January 2026.19 January 2026 - CIS tax deducted for the month ended 5 January 2026 is payable by today.31 January 2026 – Last day to file 2024-25 self-assessment tax returns online.31 January 2026 – Balance of self-assessment tax owing...