they leave the Zone. Foreign goods may be used to manufacture other goods within the zone for export without payment of customs duties. Estate and gift taxes Estate and gift taxes in the United States are imposed by the federal and some state governments. The estate tax is an excise tax levied on the right to pass property at death. It is imposed on the estate, not the beneficiary. Some states impose an inheritance tax on recipients of bequests. Gift taxes are levied on the giver (donor) of property where the property is transferred for less than adequate consideration. An additional generation-skipping transfer (GST) tax is imposed by the federal and some state governments on transfers to grandchildren (or their descendants). The federal gift tax is applicable to the donor, not the recipient, and is computed based on cumulative taxable gifts, and is reduced by prior gift taxes paid. The federal estate tax is computed on the sum of taxable estate and taxable gifts, and is reduced by prior gift taxes paid. These taxes are computed as the taxable amount times a graduated tax rate (up to 35% in 2011). The estate and gift taxes are also reduced by a major "unified credit" equivalent to an exclusion ($5 million in 2011). Rates and exclusions have varied, and the benefits of lower rates and the credit have been phased out during some years. Taxable gifts are certain gifts of U.S. property by nonresident aliens, most gifts of any property by citizens or residents, in excess of an annual exclusion ($13,000 for gifts made in 2011) per donor per donee. Taxable estates are certain U.S. property of non-resident alien decedents, and most property of citizens or residents. For aliens, residence for estate tax purposes is primarily based on domicile, but U.S. citizens are taxed regardless of their country of residence. U.S. real estate and most tangible property in the U.S. are subject to estate and gift tax whether the decedent or donor is resident or nonresident, citizen or alien. The taxable amount of a gift is the fair market value of the property in excess of consideration received at the date of gift. The taxable amount of an estate is the gross fair market value of all rights considered property at the date of death (or an alternative valuation date) ("gross estate"), less liabilities of the decedent, costs of administration (including funeral