This page looks at what to do if you have paid too much tax on your employment or pension income.

If you no longer need to file self assessment tax returns, you should tell HMRC.

If, after you have filed your tax return, you become aware that an entry is incorrect, you can amend that return if you are in time to do so. Also, if you have used provisional figures when you completed a tax return, you will need to amend your tax return when the actual information becomes ...

Self assessment payments are usually due by 31 January following the end of the tax year to which they relate. For example, tax due for the 2022/23 tax year is due for payment by 31 January 2024.

If you were required to submit tax returns to HMRC but you did not do so, HMRC may eventually send you a ‘determination’ of the tax they think you owe. 

A key part of self assessment is calculating your tax (and, if appropriate, self-employed National Insurance contributions and student loan repayments) due for the tax year and including this on the tax return.