10% of the P11d value. Rising by 1% each year.
Tax year to 5th April 2020/21 2021/22 2022/23
P11D value £47,850 £47,850 £47,850
Percentage charge 10% 11% 12%
Benefit in kind £4,785 £5,264 £5,742
Tax payable at 20% £957 £1,053 £1,148
Tax payable at 40% £1,914 £2,105 £2,297
No, that's the amount you'll pay income tax on.So 4,853 a year? = £404 a month?
There are quite a few websites which can work this out for you...
There are also others which are more user friendlyIncluding HMRC's own website.