The US personal tax code looks extremely complicated to British eyes, but British people have a similar calculator at their disposal at https://listentotaxman.com/ though it only goes back to 2000.
That said, in tech Americans seem to make 50%-100% more total comp on a cost of living adjusted basis doing exactly the same job...
That's a generalisation, although some conservatives do make the claim. It's nonsense, of course: the most other developed countries including the UK spend around a third as much per person on healthcare. Another victim of poorly regulated market consolidation (among other factors).