In this section:
Check you're paying the right tax Check how much tax you're paying, quick check calculator, links to guidance on tax codes and/or Self Assessment calculations
How to correct mistakes in your tax What to do if you're paying the wrong amount of tax - correcting underpayments/over repayments, links to reclaiming overpaid tax
Understanding and checking your P800 Tax Calculation Why you get a P800 Tax Calculation, how to check it, what to do if there's a mistake
Tax when starting, leaving or retiring from work How to avoid overpaying or underpaying Income Tax, including when you have more than one job or are starting self-employment
Reporting changes that might affect your taxChanges you need to tell HM Revenue and Customs about to make sure you pay the right amount of Income Tax, how to report them
