The Net Investment Income Tax is imposed by section 1411 of the Internal Revenue Code. The NIIT applies at a rate of 3.8 percent to certain net investment income of individuals, estates and trusts that have income above the statutory threshold amounts. The Net Investment Income Tax went into effect on Jan. 1, 2013. The NIIT affects income tax returns of individuals, estates and trusts, beginning with their first tax year beginning on (or after) Jan. 1, 2013.
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