if i get £450 car allowance per month, how much is it after taxes?

Question

does my salary level affect the level of my car allowance tax or is this calculated separately ?

Answer 1

For tax and national insurance purposes the car allowance is just treated as extra salary.

So yu will have 33% deducted if you are not a higher rate taxpayer (giving a net of £301.50) or 41% if you already pay at the higher rate (net £265.50).

If you are a basic rate taxpayer and the car allowance pushes you into the higher rate then the answer will be somewhere between the two.

Those percentages include both tax and national insurance, i.e. (22 + 11)% and (40 + 1)%.

Answer 2

Same as me. I allow for a net figure of approx £310-320, at 22 % tax, plus national insurance.