Net investment income tax (NIIT), also affectionately known as the ‘You-Make-A-Lot-of Money Tax,’ involves the net investment income of individuals, estates, and trusts. According to the Wall Street Journal, more Americans than ever before could be owing this tax due to inflation and higher yields on bank accounts and bonds. The IRS defines NIIT as a surtax where individual taxpayers are liable for a 3.8 percent Net Investment Income Tax on the lesser of their net investment