Your tax code is used by your employer or pension provider to work out how much Income Tax to take from your pay or pension. HM Revenue and Customs (HMRC) will tell them which code to use.
If you believe your tax code is wrong you should contact HMRC who will issue your employer with a revised tax code as required. This can be done by phone – 0300 200 3300 – or on-line .
f you think your tax code is wrong
If you think your tax code is wrong, you can update your employment details using the check your Income Tax online service.
Why your tax code might change
HMRC may update your tax code if:
- you start to get income from an additional job or pension
- your employer tells HMRC you have started or stopped getting benefits from your job
- you get taxable state benefits
- you claim Marriage Allowance
- you claim expenses that you get tax relief on
You may also be put on an emergency tax code if you change jobs.