100 Days until Self Assessment Tax Returns Deadline

WITH 100 DAYS until the 31 January 2026 deadline, HM Revenue and Customs (HMRC) is reminding those yet to file their Self Assessment tax return to do it early.

More than 3.5 million people have already filed for the 2024 to 2025 tax year. Those who start their return early can go back to it as many times as they need to before submitting it. Filing early means they also know how much tax is owed sooner and can prepare to pay their bill by the deadline.

Last year, more than 97% of tax returns were filed online. Tax returns for the 2024 to 2025 tax year can be completed on GOV.UK where there is also access to a range of guidance to help people prepare and file their return.

Myrtle Lloyd, HMRC’s Chief Customer Officer, said: “With 100 days to the Self Assessment deadline, now is the time to get started. Completing your return now means you know how much tax you need to pay ahead of the deadline. We are here to help with lots advice, just search ‘file a tax return’ on GOV.UK to find out more.”

Self Assessment Deadline

Anyone unsure if they need to fill in a tax return of the 2024 to 2025 tax year, can use the Self Assessment checker tool on GOV.UK where they can also register and notify HMRC if they no longer need to complete one.

People who have sold assets such as shares after 30 October 2024 need to be aware of changed rates of Capital Gains Tax for the disposal of assets when completing their Self Assessment tax return as it won’t automatically calculate the correct amount of Capital Gains Tax due. Instead, they may need to work out an adjustment to the tax automatically calculated using the adjustment calculator on GOV.UK.

The new High Income Child Benefit Change (HICBC) PAYE digital service means thousands of Child Benefit claimants who are only in Self Assessment to pay HICBC can now opt out and can choose to pay the charge back through their tax code.

Eligible customers can call HMRC to de-register from Self Assessment before the filing deadline in a tax year. Where a tax return has already been sent, customers can choose to de-register from the following tax year. HMRC will then amend their tax code and they will be registered to pay HICBC through PAYE.

Customers do not need to include their 2025 Winter Fuel Payment, or Pension Age Winter Heating payment in Scotland, on their tax return for the 2024 to 2025 tax year as payments received in Autumn 2025 will be recovered in the 2025 to 2026 tax return, due by 31 January 2027.

Customers need to be aware of the risk of falling victim to scams and should never share their HMRC login details with anyone, including a tax agent, if they have one. HMRC scams advice is available on GOV.UK.

>> Read more tax return guidance from HMRC in the news