Tax Return Deadline 2024 October. Every 31st january, you need to file your online self assessment tax return for the previous tax year, not the current one. Send your tax return by the deadline.
Review information about due dates and when to file tax returns. You can extend the due date for filing your personal income tax return by six months, to october 15, 2025, for 2024 tax year returns, by filing form 4868 or making an electronic tax.