An estimated 1.1 million people missed the 31 January 2025 deadline for filing their 2023/24 tax returns according to HMRC.
They now face a penalty of at least £100 for missing the cut-off at the end of the day on Friday, the tax authority has said, unless they can provide a valid excuse for failing to file.
More than 11.5 million people did complete the self-assessment process, including more than 31,000 who finished it during the final hour before the deadline on 31 January 2025
For those who missed the self-assessment deadline, the penalties include:
- An initial £100 penalty, even if there is no tax to pay
- Additional daily penalties of £10 a day after three months, up to a maximum of £900
- After six months, a further penalty of 5% of the tax due or £300, whichever is greater
- After 12 months, the higher of another 5% of the tax due or £300 charge
There are also fines for late payment of the tax owed, with interest added on top