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:
- check how much Income Tax you paid last year (6 April 2016 to 5 April 2017)
- estimate how much Income Tax you should have paid in a previous year
There’s a different way to change a Self Assessment tax return.