The 50% is only on earnings above £150,000.
On £250,000 or $360,000 gross earnings.
UK
Income tax
0% on first £6,475
10% on next £2,230
22% on next £34,600
40% on next £108,925
50% on the rest
Total income tax paid = £76,492.5 / $112,571
National insurance
11% on first...