Self Assessment is HMRC’s system for individuals and businesses to report income and calculate their own tax bill each year. If you’re self-employed, a landlord, have untaxed income, or need to claim certain reliefs, you’ll usually need to file a Self Assessment tax return online or by paper. The process includes reporting income, expenses, and paying any tax due—by set deadlines.
« Back to Glossary Index
Tax Guide UK Editorial Team: Our team of financial writers, tax researchers, and editors is dedicated to making UK tax easier to understand — and easier to manage. Every article is thoroughly researched, regularly updated, and written in plain English to help you stay compliant and confident.View Author posts