https://en.wikipedia.org/wiki/Taxation_in_Denmark Under the Danish tax system, it is possible for a high-wage earner to pay up to 51.5% of their total income after gross tax, giving a total of 57% of total income.
The actual number, as a percentage of your income, that you pay in the US is very likely around - if not higher - than 50%.
And... there's a weird hump, because capital gains are taxed at a much lower rate. in that bracket, you have the very top end of those who work as employees, and small business owners who end up having to pay income tax on their profits. Much above that and most of your income is usually in the form of capital gains, and thus taxed less.