The UK tax authority (HMRC) has urged citizens not to delay the preparation of their Self Assessment tax returns until the last moment. The deadline for online submission is 31 January, and the authority recommends starting the process well in advance. According to HMRC, many taxpayers traditionally postpone filling out their returns until the final weeks before the deadline, which leads to increased stress, rushed work, and a greater likelihood of making mistakes. Starting early allows time to calmly gather all necessary documents, clarify any unclear points, and seek advice if needed without the pressure of tight deadlines. The authority also reminds taxpayers that early submission of a return provides more time for financial planning, including the opportunity to find out in advance the amount of tax owed and budget accordingly. This is particularly relevant for self-employed individuals, small business owners, and those who receive income from sources other than their main employment. HMRC emphasizes that the online return submission service is available year-round, and users can begin filling out the form immediately after the end of the tax year without waiting for January to approach. The authority also provides online guidance and support for those encountering the self-assessment procedure for the first time.