Your Personal Allowance may be greater than £12,570 if you claim Marriage Allowance or you are eligible for the Blind Person’s Allowance. It can also be reduced for high earners (earning more than £100,000) and is zero if your income is £125,140 or above.
As with the rest of the UK, those earning more than £100,000 will see their Personal Allowance reduced by £1 for every £2 earned over £100,000