5. Check you're paying the right amount

You can see if you’re paying the right amount of Income Tax online. For the current tax year (6 April 2017 to 5 April 2018), you can:

You can also:

If you can’t use these services, you can check you’ve paid the right tax by contacting HMRC or by getting help from an accountant.

There’s a different way to change a Self Assessment tax return.