You'll only get that tax rate at very high salaries and it's also of course marginal. In the UK the first 12k (~$17k) is entirely tax free for example. After that it's 20% up until you have earned 50k (~$70k). Only after that does the 40% tax kick in. So on a $75k salary, only $5k will be taxed at 40%.
For a $75k salary you would be paying just over 16% tax and 9% national insurance (i.e. pension) in the UK.
When I first started working as a SWE in the UK I worked out that my average tax rate was actually slightly lower than if I earned the same in California. If I was earning 2-3x more then the higher European taxes start to kick in.