The big ones, in billions of dollars:
Exclusion of employer-paid health insurance premiums: 185 (!!!)
Exclusion of pension contributions, total: 129
Exclusion of net imputed rental income: 72 *** what is this?
Mortgage interest deduction: 69
Capital gains (except resources): 69
Deferral of income from controlled foreign corporations: 63 *** what is this?
Accelerated depreciation of machinery and equipment: 48
Deductibility of state, local taxes (not owner-occupied homes): 44
Charitable deductions: 39
Exclusion of Social Security benefits, total: 38
Capital gains exclusion on home sales: 34
Property tax deduction: 29
Exclusion of interest on public bonds: 28
Treatment of qualified dividends: 24
Step-up basis of capital gains at death: 23
Child credit: 23