Estate tax in the United States subject to a different regime for estate tax than U.S. citizens and residents. The estate tax is imposed only on the part of the gross non-resident alien's estate that at the time of death is situated in the United States. These rules may be ameliorated by an estate tax treaty. The U.S. does not maintain as many estate tax treaties as income tax treaties, but there are estate tax treaties in place with many of the major European countries, Australia, and Japan. U.S. real estate owned by a non-resident alien through a foreign corporation is not included in a non-resident
Income tax in the United States direct tax on the basis of the source of the income. The Amendment removed the need for the income tax to be apportioned among the states on the basis of population. Income taxes are required, however, to abide by the law of geographical uniformity. Some tax protesters and others opposed to income taxes cite what they contend is evidence that the Sixteenth Amendment was never properly ratified, based in large part on materials sold by William J. Benson. In December 2007, Benson's "Defense Reliance Package" containing his non-ratification argument which he offered for sale on the Internet, was ruled by