View Research by Author - Katherine Lim

Citation URL: http://www.urban.org/KatherineLim

The alternative minimum tax (AMT), which originally targeted high-income taxpayers, requires annual legislation to prevent it from affecting millions of middle-income individuals each year. There are two primary reasons for the AMT’s broadening impact; its parameters are not indexed for inflation and the 2001-2006 tax cuts reduced regular tax liability without changing AMT liability. In 2009, four million taxpayers will pay $33.5 billion in AMT, but without congressional action that number will rise to 27 million owing $102 billion in 2010. This paper describes the AMT and provides TPC’s latest estimates of AMT coverage, revenue, and distribution.

The largest tax preferences for housing, health care, and retirement saving reduce federal revenues by about 3 percent of GDP. They raise after-tax income proportionally more for higher income groups than lower income groups, but raise income proportionately less for those at the very top. The net distributional effects depend on how these tax preferences are financed. If paid for with higher marginal tax rates, they benefit upper-middle income taxpayers at the expense of both lower-income and the highest-income taxpayers, but if paid for by lower per-capita spending, all high-income groups gain and all low-income groups lose.

In this paper we review the current wealth transfer tax rules and the changes introduced in 2001. We offer an overview of the methodology underlying the TPC's estate tax model and then use the model to estimate the number of estate tax filers, taxable returns, and the distribution of burden under current law. Finally, we investigate the revenue and distributional effects of several proposals to reform the estate tax, including those put forth by the presidential candidates.

A taxpayer's effective marginal tax rate (EMTR) is the percentage of an additional dollar of income that would be paid in federal income tax. An individual's EMTR could affect the decision to work or save more, or avoid income tax. We use the TPC's microsimulation model of the federal tax system to calculate EMTRs under current law and under the presidential candidates' proposals. The Obama plan would lower EMTRs for the majority of households in 2009. Close to 80 percent of the population would see no change in their EMTR under Senator McCain's plan; most others would face lower rates.

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