6. If you think your code is wrong

You may think your tax code is wrong if, for example:

  • the numbers and letters don’t match your situation
  • your payslip shows that the wrong amount of Income Tax is being taken off

Emergency tax codes are usually updated automatically after you’ve given your new employer your P45.

Tell HMRC if you think your code is wrong. If they agree, they’ll adjust your tax code so that you:

  • pay the right amount of tax for all of your income, spread over a year
  • get the Personal Allowance you’re entitled to

At the end of the tax year

You can check you paid the right amount of tax after the end of the tax year (5 April).

You can claim a refund if you think you’ve paid too much.