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 |