HM Revenue and Customs (HMRC) has issued a stark warning to taxpayers: complete your tax returns promptly or face penalties of up to £900. The tax authority is alerting nearly 5.7 million individuals to mark a crucial date in their diaries following the festive period. HMRC is pressing millions to submit their tax returns before the deadline to avoid substantial fines. The cut-off date for filing a tax return for the 2022 to 2023 tax year and settling any outstanding tax is 31 January 2024, the revenue service has cautioned UK households. Those anxious about potential penalties managed to submit their returns during key bank holidays throughout the Christmas season, officials revealed. In a recent update, HMRC disclosed that over 4,600 Self Assessment customers completed their tax returns on Christmas Day itself. Altogether, 37,435 customers filed between Christmas Eve and Boxing Day, indicating that for some taxpayers, festive filing has become as traditional as watching the King’s Speech or dodging the washing up. HMRC is encouraging Self Assessment customers who haven’t yet submitted their tax …