Suddenly put in M1 tax code?

jimmo

Take a look at your Personal Tax Account again.
Click on "Check Next Tax Year"
A little way down the page it gives your tax codes for 2018/19 and 2019/20.
Just below that there is a heading " Tax Free Amount".
That section starts off with your Personal Allowance and then goes on to show "Deductions", giving a description and an amount.
The description and amount for each year are the details we need to be able to advise you.