Earliest You Can File Taxes 2025 In Uk. The deadline for online submissions to hmrc is 31 january 2025, while the deadline for paper returns was 31 october 2024. A 5% late payment penalty will be applied to any outstanding 2023/24 tax liabilities that were due on 31st january 2025.
The 2025/26 tax year begins on 6 april 2025 and ends on 5 april 2026. Below is a list of key.