Economic Development Act of 2005 - Authorizes any State to provide to any person for economic development purposes tax incentives that otherwise would be the cause of discrimination against interstate commerce under the Commerce Clause of the Constitution. Makes exceptions for any incentive that: (1) is dependent upon State or country of incorporation, commercial domicile, or residence of an individual; (2) requires the recipient to acquire, lease, license, use, or provide services to property created in the State; (3) is reduced or eliminated as a result of an increase in out-of-State activity by the recipient or other person or as a result of such other person not having a taxable presence in the State; (4) results in loss of a compensating tax system, because the tax on interstate commerce exceeds the tax on intrastate commerce; (5) requires that other taxing jurisdictions offer reciprocal tax benefits; or (6) requires that a tax incentive earned with respect to one tax can only be used to reduce a tax burden for, or provide a tax benefit against any other tax that is not imposed on, apportioned interstate activities.