HM Revenue and Customs (HMRC) has issued a stark warning to millions of UK taxpayers, alerting them to an imminent deadline that could result in substantial financial penalties. Households completing a self-assessment tax return have until 31 January 2026 to file online or risk a series of escalating fines.
Steep Penalties for Missing the Deadline
The initial penalty for a late return is an immediate £100 fine, applied if the submission is up to three months overdue. However, the charges do not stop there. After the three-month point, a daily penalty of £10 can be levied, accumulating to a maximum of £900 over 90 days.
For those who are significantly late, the penalties become even more severe. After six months, a further penalty of 5% of the tax due or £300, whichever is greater, is applied. If the return remains unfiled after 12 months, another 5% or £300 charge is added. Any fines issued must be paid within 30 days of the penalty notice date.
Correcting Mistakes and Claiming Refunds
HMRC has clarified that it is possible to correct a tax return if an error is discovered. Taxpayers have 12 months from the Self Assessment deadline to amend their submission, either online or by sending a revised paper return. Upon correction, the tax bill will be updated, which could mean paying more tax or, alternatively, being eligible to claim a refund.
HMRC Issues Urgent Scam Alert
Alongside the deadline reminder, HMRC has issued a critical warning about a surge in fraudulent communications. Criminals are impersonating the tax authority via email, text, and phone calls in an attempt to steal personal and financial information from unsuspecting individuals.
Lucy Pike, HMRC’s chief security officer, stated: “Millions of people file a tax return each year and scammers mimic HMRC to try and catch unsuspecting victims out.” She urged the public to stay vigilant after the Christmas period, adding: “If any emails, text messages or phone calls appear suspicious – don’t be lured into clicking on links or sharing your personal information – report it directly to HMRC.”
Taxpayers are advised to always access HMRC services directly through the official GOV.UK website and to never share sensitive details like passwords or bank information in response to unsolicited messages.
