If your tax code has ‘W1’ or ‘M1’ or ‘X’ at the end these are "emergency tax codes". Tax codes with ‘K’ at the beginning mean you have income that is not being taxed another way ...

She said: "Most people's tax codes are 1257L, this means you can earn up to £12,570 a year tax-free." M1 is a kind of ...

Workers across the country could claim thousands of pounds by keeping an eye out for a certain code on their payslips, HMRC says.