1 December 2023 - Due date for Corporation Tax payable for the year ended 28 February 2023.

19 December 2023 - PAYE and NIC deductions due for month ended 5 December 2023. (If you pay your tax electronically the due date is 22 December 2023).

19 December 2023 - Filing deadline for the CIS300 monthly return for the month ended 5 December 2023. 

19 December 2023 - CIS tax deducted for the month ended 5 December 2023 is payable by today.

30 December 2023 - Deadline for filing 2022-23 self-assessment tax returns online to include a claim for under payments to be collected via tax code in 2024-25.

1 January 2024 - Due date for Corporation Tax due for the year ended 31 March 2023.

19 January 2024 - PAYE and NIC deductions due for month ended 5 January 2024. (If you pay your tax electronically the due date is 22 January 2024).

19 January 2024 - Filing deadline for the CIS300 monthly return for the month ended 5 January 2024. 

19 January 2024 - CIS tax deducted for the month ended 5 January 2024 is payable by today.

31 January 2024 – Last day to file 2022-23 self-assessment tax returns online.

31 January 2024 – Balance of self-assessment tax owing for 2022-23 due to be settled on or before today unless you have elected to extend this deadline by formal agreement with HMRC. Also due is any first payment on account for 2023-24.