Self Assessment Tax Return 2025 2025 Online Degree. Self assessment is one of the easiest ways of filing income tax returns online. Your self assessment tax return (sa100, sa800, sa900) normally has to be completed and submitted to hmrc by 31st october following the tax year end (5th april) if you.
You would have until 5 october 2024 to tell us that you need to complete a tax return. You would have until 31 october 2024 to complete a paper return and 31 january 2025.