Which tax code do you have

M and n tax codes for the marriage allowance you may be able to pass 10 % of your personal allowance onto your spouse thanks to the marriage allowance 

Hthis happenes if you are paying tax that you owe from a previous year through your wages or pension getting state benefits that you need to pay tax on or getting benefits from work

This code is used to indicate if your income or pension is taxed using the rates in Scotland your tax code will be S1257L If you pay Scottish income tax and get the Standard Personal allowance 

THE t and 0T tax codes are used for income over100000 euros