Taxpayers have now entered the 100-day countdown to complete and submit their Self Assessment returns for the 2024–2025 tax year, which ended on April 5, 2025.
HMRC is urging individuals to begin preparing their returns as key deadlines approach. More than 97% of Self Assessment customers now file online, a method HMRC recommends to avoid last-minute issues and penalties.
The deadline for filing paper tax returns passed at midnight on October 31, 2025. Anyone who missed this date must now file online. The remaining major deadlines fall on January 31, 2026, including the cut-off for filing online returns and paying any tax owed for the 2024–2025 tax year.
HMRC warns that missing the filing deadline results in an automatic £100 penalty, regardless of whether tax is owed or has already been paid. Further penalties and interest accrue the longer a return or payment is delayed.
With the clock ticking, individuals are advised to file early. Doing so provides clarity on the amount owed and allows time to budget before the January payment deadline. Those who expect difficulty paying their bill may be able to set up a Time to Pay arrangement with HMRC, spreading the cost over manageable instalments.
Internet link: GOV.UK
