Check if you need to send a Self Assessment tax return

Use this tool to find out if you need to send a tax return for the 2025 to 2026 tax year (6 April 2025 to 5 April 2026).

This service is also available in Welsh (Cymraeg).

The tool will not send your details to HM Revenue and Customs (HMRC).

If you have additional income, for example by selling things online or renting out part of your home, check if you need to tell HMRC.