1. Overview

Self Assessment is a system HM Revenue and Customs’ (HMRC) uses to collect Income Tax.

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 send one, you fill it in after the end of the tax year (5 April) it applies to.

Sending your return

Log in and file your tax return online, or send a paper form.

Deadlines

Send your tax return by the deadline (31 January if you file online).

If you didn’t send an online return last year, allow extra time (up to 20 working days) as you’ll need to register first.

Filling in your return

You need to keep records (eg bank statements or receipts) so you can fill in your tax return correctly.

You can get help, eg from HMRC or by getting an accountant to do your return for you.

Paying your bill

HMRC will calculate what you owe based on what you report.

Pay your Self Assessment bill by 31 January (or 30 December if you want HMRC to collect tax automatically from your wages or pension).

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