Workers are being urged to check they have not be overcharged due to the new tax year and national insurance changes.
Your tax code is used by HMRC to determine how much tax you should be paying each month. It is made up of numbers and letters to represent how much you can earn before you start being taxed.
Martin Lewis said If you've had a pay packet since April 6, you should check to see if you're on the right tax code. If it's wrong, you might be able to reclaim cash you've overpaid.
