Using NBER's TaxSim, a program that calculates expected income tax rates from a random sample of actual IRS returns, Corrections produces a graph of after-tax income against before-tax income for several states. This includes only State and Federal Income Tax, along with FICA taxes. It assumes a married earner with 2 children, a rent of $1500, and no other deductions or income. Tax rates are for 2010.
This is a worst case scenario in terms of total income: all is labor income, which is punished most severely. Capital income, quite rightly, is generally taxed at lower rates.