FICA...which is retirement income, medicare, death and disablity payments is split into two pieces. The first part - retirement is 6.2% on income up to a maximum of around $95,000 (it goes up every year) and 1.45% for medicare. That totals 7.65%. Your employer matches that contribution and pays exactly the same dollar amount on your behalf.

Unless you are self-employed as I am. I pay 15.3%.

Most people pay around 25% of their income in federal taxes.