• To the surprise of some, even though Senator Obama’s tax plan lowers taxes for the bottom four quintiles, marginal tax rates would fall only for the very lowest-income couples. Taking both income and payroll taxes into account, those at the very bottom of the income distribution would see their effective marginal tax rates fall from 27.4 percent to minus 58.6 percent due to proposed changes to the earned income tax credit and Senator Obama’s new “Making Work Pay” credit.
    • Most low- and moderate-income couples would see their effective marginal tax rates rise, in some cases, significantly. Indeed, some low- and moderate-income taxpayers will see their marginal rates rise to more than 50 percent.