You can see if you’re paying the right amount of Income Tax online. For the current tax year (6 April 2023 to 5 April 2024), you can:
check your Income Tax payments
work out how much Income Tax you should be paying
You can also:
check how much Income Tax you paid last year (6 April 2022 to 5 April 2023)
estimate how much Income Tax you should have paid in a previous year
If you cannot 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.