Taxing Adjusted Gross Income Instead of Taxable Income

The House leadership has proposed to finance health care reform with a surtax on adjusted gross income (AGI) of high-income individuals, while the president's budget would increase the two top marginal tax rates on taxable income. Income taxed at statutory marginal rates is 58 percent of AGI for all taxpayers but only 46 percent of AGI for taxpayers with income over $1 million. While personal exemptions and deductions account for most of the difference between the two tax bases for the population as a whole, capital gains and qualified dividends make up most of the difference for very high income taxpayers.