How would one calculate the U.S treasury bond, city of maryland bond , and tax on preferential income and does this appear correct?

Federal Income Tax Computations: Taxable income Preferentially taxed income Income taxed at ordinary rates $213,982 $3,010 $210,972 38674.808 0 Tax on income at ordinary tax rates Tax on preferential income: City of Maryland Bond U.S. Treasury Bond Dividends from shareholdings Regular federal income tax 282.75 Federal Income Tax Computations: Taxable income Preferentially taxed income Income taxed at ordinary rates $213,982 $3,010 $210,972 38674.808 0 Tax on income at ordinary tax rates Tax on preferential income: City of Maryland Bond U.S. Treasury Bond Dividends from shareholdings Regular federal income tax 282.75