The comprehensive guide to completing your 2016-2017 Self Assessment tax return online.
Do you need to do self assessment
Key dates to remember
Registering for Self Assessment
Information and documents you'll need
Expenses you could claim
Completing your tax return online
General tips that make this journey a breeze
We created the CitizenTax app to make your taxes a little less taxing - and you can use it to work out if you need to complete a Self Assessment. CitizenTax is available through iTunes and GooglePlay.