Key dates for the UK tax year 2023/24

Self-assessment tax return dates 2023/24

Here are your Self Assessment tax return dates, and other important deadlines for individuals and self-employed in the 2023/24 tax year:

5 April 2023 The 2022/23 tax year ends
6 April 2023 The 2023/24 tax year begins
31 July 2023 Second Payment on Account (POA) for Income Tax for 2022/23
5 October 2023 Deadline for Self Assessment registration to notify chargeability of Income Tax/Capital Gains Tax for 2022/23
19 October 2023 Deadline for postal payments of CIS, Class 1 B NICs and PAYE to HMRC
22 October 2023 Deadline for electronic remittance of CIS, Class 1 B NICs and PAYE to HMRC
31 October 2023 Deadline for postal submission of Self Assessment tax returns for tax year ended 5 April 2023 to be received by HMRC
30 December 2023 Deadline for online submission of Self Assessment tax returns for tax year ended 5 April 2023
31 December 2023 The due date to file company accounts with Companies House for limited companies with 31 March 2023 year end
14 January 2024 Income tax due date for CT61 period to 31 December 2023
31 January 2024 Deadline for filing Self Assessment Tax Returns for the tax year ended 5 April 2023 and 2022/23 Capital Gains Tax
Balancing payment of tax due for 2022/23 and first Payment on Account for Income Tax for 2023/24
5 April 2024 The 2023/24 tax year ends
6 April 2024 The 2024/25 tax year begins