Around one million people missed the deadline to file their self-assessment tax return, leaving them facing automatic penalties, according to HM Revenue and Customs.
HMRC said 27,456 taxpayers filed in the final hour before the midnight cut-off at the end of Saturday, after the tax authority kept helplines open and extended webchat services over the weekend in a bid to help late filers.
The busiest period for online submissions was between 5pm and 6pm on Saturday. In total, 475,722 people filed on the final day, bringing the overall number of submissions for the 2024–25 tax year to around 11.5 million.
Anyone who failed to file on time now faces an automatic £100 penalty, even if there is no tax to pay or the tax owed has already been settled.
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