45% tax
They pay like 13% national insurance.
The rest of the tax is paid by the employee. And the 45% rate is only on any earnings OVER £150k. So the money eart less than that is at lower rates.
Threshold is probably 100 + (personal allowance)*2 where that was 12.5ish last I looked.
Also some state support (childcare maybe?) evaporates at 100, which is fairly similar to another tax.