The UK tax year runs from April 6th to April 5th of the following year. This period is used for reporting income, calculating tax allowances, and filing self-assessment tax returns with HM Revenue & Customs (HMRC).

Key Points About the UK Tax Year

• The tax year starts on April 6 and ends on April 5 of the next year.
• Tax allowances, personal allowances, and ISA allowances are calculated based on this tax year.
• Important deadlines within the tax year include the self-assessment filing deadlines on October 31 (paper returns) and January 31 (online returns).
• The unique April-to-April tax year originated historically due to calendar changes and rent quarter dates.

Thus, for any current or future tax years, the UK continues to follow this April 6 to April 5 cycle.