The final deadline to submit your online Self-Assessment tax return is January 31, 2025 (by midnight). If you owe tax, it must also be paid by the same date. If you have advance payments (known as "payments on account"), the second payment is due by July 31. Please note, failure to submit or pay on time will usually result in a penalty, but you can appeal if you have a reasonable excuse.

If you are unsure of your total profit for the year when filing your tax return, you can submit provisional figures and notify HMRC. Once you know your actual profit, you must update your return within 12 months. If you owe more tax, interest will be charged on the difference from the original payment due date. If you've overpaid, you will receive interest back.

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