Tax Rates. Based on the amounts of taxable income ... Save Tax Rates. Based on the amounts of taxable income below, compute the federal income tax payable in 2016 on each amount assuming the taxpayers are married filing a joint return. Also, for each amount of taxable income, compute the average tax rate and the marginal tax rate. Taxable income of $30,000.

. Taxable income of $100,000.

. Taxable income of $375,000.

. Taxable income of $600,000.