For our international readers who may not be familiar with the rigamarole of the US tax structure there are many layers.
Income is taxed at several levels:
Federal (35% on income over about 375k, 25% between 35 and 80k, and various other levels above and below that)
State (0% to 11% with each state having their own rates and brackets
Municipal taxes (with some random searching i found up to 3% in parma heights, ohio I'm sure some are more, and many there are none)
And there are of course many other non-income sources of taxation:
Property (meaning houses, usually taxed at the county level in my experience, in between state and Municipal, depends on the value of the house, sometimes the use)
Property (some states tax additional forms of property, cars, boats, etc.)
Sales tax (most states have this in some form or another, but also some counties and some towns will tack on some themselves)
Payroll Taxes (15.3 for social security and medicare combined, which is genrally split with your employer)
and of course some states have their own disability insurance or unemployment insurance that is taken from your payroll as well.
Then you have to mix that all together. Some taxes will not count as income for other taxes (e.g. money you pay on your property tax may not be counted as income on your federal and state taxes). And each type of tax may allow various different deductions and credits (e.g. medical insurance payments may count as income on your federal taxes but not your state, etc, etc.
As a random and personal yardstick, about 25% of my paycheck is deducted for various non-voluntary things.