you were a trustee of a trust or registered pension scheme
you had a P800 from HMRC saying you didn’t pay enough tax last year - and you didn’t pay what you owe through your tax code or with a voluntary payment
your State Pension was more than your Personal Allowance and was your only source of income - unless you started getting your pension on or after 6 April 2016.
Certain other people may need to send a return (for example ministers of religion or Lloyd’s underwriters) - you can check whether you need to. You usually won’t need to send a return if your only income is from your wages or pension.
How do I know how much tax I owe?
When you fill in a tax return online, it automatically works out and displays how much tax and Class 4 National Insurance contributions you owe. It will also allow you to print your calculation.
How do I register to send my return online?
You can register on GOV.UK. During registration, you’ll be given a User ID and will be asked to choose a password - naturally, you’ll need these when you login again.
We’ll then send you an activation code by text. Once you’ve activated the service, you can fill in your return.
I’ve lost my User ID and password, what do I do?
It happens to the best of us! If you have problems signing in, there a number of ways to reset and gain access to your tax account. Watch our YouTube tutorial to find out more.
When does my 2016/17 return need to be completed?
Your online Self Assessment tax return needs to be in by 31 January 2018, otherwise you will receive a £100 fine.