Understanding Self Assessment and your tax return

Self Assessment is a system HM Revenue & Customs (HMRC) uses to collect Income Tax. Income Tax is usually deducted automatically from wages, pensions, and savings. However, people and businesses with other income must report it in a Self Assessment tax return.

Do I need to file a Self Assessment tax return?

You can find out who must send a tax return and check if you need to fill in a Self Assessment return.

This guide will help you understand Self Assessment including how to register for Self Assessment with HMRC, how to file your first Self Assessment tax return, and key deadlines for Self Assessment.