The personal allowance is the amount a person can earn in the UK before they pay income tax. The personal allowance rates vary from one year to the next. The Chancellor of the Exchequer decides which rates are applicable. Rates of personal allowance per tax year are as follows:
Your Personal Allowance goes down by £1 for every £2 that your adjusted net income is above £100,000. This means your allowance is zero if your income is £125,000 or above.