If the code has changed (the numbers and a letter) then it's become M1 to prevent a refund/ deduction of tax from the start of the tax year.
If the numbers gone up, you are better off (unless they are preceded by a K)
@DethBeard started
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If the code has changed (the numbers and a letter) then it's become M1 to prevent a refund/ deduction of tax from the start of the tax year.
If the numbers gone up, you are better off (unless they are preceded by a K)