[flagged]
The UK has tax brackets like everyone else and the same family would pay about 27% income tax and about 8% of their income in vat.
It looks like everyone but the very well off is worse off in the US.
Keep in mind that that family doesn't have the threat bankruptcy from an uncovered emergency room bill as well.
London has a house price to median income ratio of 13. The same figure is 10 in San Francisco.