It says my personal allowance is £12,570 yet I’m still getting taxed and my tax code is 740tx?

Hello I was wondering why does it say my personal allowance is £12,570 yet I’m still getting taxed and why is my tax code 740tx not 1257 ?

Hi,

A 't' suffix in your code means that it includes other calculations to work out your Personal Allowance. To fully explain your code, and amend it if necessary, you will need to contact our Income Tax team.

Income Tax: general enquiries

Thank you.