This is a nonsense - how many European countries have federal government? For example the high tax in Sweden corresponds to the COMBINED federal tax, social security tax, state tax, etc, etc ...
Add it up: state income tax, sales tax, excise taxes (gas, tobacco, liquor), property taxes, not to mention the pestilential hidden taxes imposed on phone & utility bills, "franchise fees" (the kickback the cable company pays to local politicians), use fees, permit fees, turning the motor vehicle code into an extortion racket, etc., etc.
I bet that bumps us up to 35% of GDP, easy.