A bill to amend the Internal Revenue Code to regulate and prevent multiple taxation of certain kinds of income.

Amends the Internal Revenue Code to prohibit a State from imposing a tax on the income of a non-domiciliary (except to the extent that such income was earned in such State) or upon the income of a domiciliary whose income was earned in another State (except to the extent that the tax imposed by the State of domicile exceeds the tax of the State in which the income was earned).