The HM Revenue and Customs website has a tax checker which is a simple way of checking whether the tax you’ve been paying is correct. It cannot be used by everyone, so check the list of exceptions first.
HMRC tax checker: http://www.hmrc.gov.uk/calcs/stc.htm
If you want to understand more about how your taxes are calculated, select the tax you are interested in from our drop-down menu on the home page. We recommend reading the Income Tax pages and Employee pages to understand what your tax code means.
If you have received a recent tax refund or bill and are not sure whether it is correct, you may want to read our recent update.