There is now less than 1 months to the self-assessment filing deadline for submissions of the 2024-25 tax returns. We urge our readers who have not yet completed and filed their 2024-25 tax return to file as soon as possible to avoid the stress of last-minute preparations as the 31 January 2026 deadline fast approaches.

You should also be aware that payment of any tax due should also be made by this date. This includes the remaining self-assessment balance for the 2024-25 tax year, and the first payment on account for the 2025-26 tax year.

Earlier this year, more than 11.5 million people submitted their 2023-24 self-assessment tax returns by the 31 January deadline. This included 732,498 taxpayers who left their filing until the final day and almost 31,442 that filed in the last hour (between 23:00 and 23:59) before the deadline!

There is a new digital PAYE service for the High Income Child Benefit Charge (HICBC). This allows Child Benefit claimants who previously used self-assessment solely to pay the charge to opt out and instead pay it through their tax code.

If you are filing online for the first time you should ensure that you register to use HMRC’s self-assessment online service as soon as possible. Once registered an activation code will be sent by mail. This process can take up to 10 working days. 

If you miss the filing deadline you will be charged a £100 fixed penalty (unless you have a reasonable excuse) which applies even if there is no tax to pay, or if the tax due is paid on time. There are further penalties for late tax returns still outstanding 3 months, 6 months and 12 months after the deadline. There are additional penalties for late payment of tax amounting to 5% of the tax unpaid at 30 days, 6 months and 12 months.