Tax is usually deducted automatically from wages, pensions and savings. People and businesses with other income must report it in a tax return. If you need to complete a tax return (external link), you need to fill it in after the end of the tax year (5 April), it applies to. 

File your tax return online (external link) or send a paper form (external link). 

If you did not send an online return last year, allow extra time (up to 20 working days) as you’ll need to register first. There are different ways to register if you’re: 

You need to keep records (external link) (for example bank statements or receipts) so you can fill in your tax return correctly. You can get help to fill in your return (external link).  

HMRC will calculate what you owe (external link) based on what you report.  

How much tax you pay will depend on the Income Tax (external link) band you are in. There’s a different rate for Capital Gains Tax (external link) if you need to pay it, for example you sell shares or a second home.