The Tax Cuts and Jobs Act (TCJA) reduced individual income tax rates, but it left the 3.8% net investment income tax (NIIT) in place. It’s important to address the NIIT in your estate plan, because it can erode your earnings from interest, dividends, capital gains and other investments, leaving less for your heirs. Net Investment Income Tax: How it works The NIIT applies to individuals with modified adjusted gross income (MAGI) over $200,000. The threshold is $250,000 for joint filers and qualifying widows or widowers and $125,000 for married taxpayers filing separately. The tax is equal to 3.8% of 1) your net investment income, or 2) the amount by which your MAGI exceeds the threshold, whichever is less. Suppose, for example, that you’re married filing jointly and you...