The deadline for submitting paper self-assessment tax returns for the 2023-24 tax year is 31 October 2024. If the return is submitted late, a £100 penalty will be imposed.
 
It is worthwhile noting that if you still file your self-assessment return on paper, you could gain an extra three months to submit the return if you switch to electronic submission.  The deadline for online returns is 31 January 2025.  
 
Taxpayers with certain underpayments in the 2023-24 tax year can elect to have this amount collected via their tax code (in 2025-26), provided they are in employment or in receipt of a UK-based pension.  The coding applies to certain debts and the amount of debt that can be coded out ranges from £3,000 to £17,000 based on a graduated scale.  
 
Daily penalties of £10 per day will also take effect if the tax return is still outstanding three months after the filing date, up to a maximum of £900.  If the return still remains outstanding, further higher penalties will be charged from six months and twelve months late.
 
We can help with any of your self-assessment queries, please contact us.