When Is Tax Day 2025 Uk. The dates for vat returns in the 2025/26 tax year depend on the quarter end but typically fall on: Common questions are ‘when does the tax year start?’ or ‘when does the tax year end?’.

Below are the uk hmrc tax dates for different tax years. You will need to complete form cwf1 for self employment or form sa1 for non self employed income, or form sa401.