Last Day To File Tax Extension 2025 Uk. This is the final date for those that are required to complete and file a self assessment tax return online. The deadline for submitting your 2023/24 tax return on paper is 31 october 2025, while those filing online have until 31 january 2025.
With that in mind, here’s a list. Customers can file their self assessment returns for the 2023 to 2025 tax year between 6 april 2025 and 31 january 2025.
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