Beginning in 2013, high-income individuals may be subject to a new 3.8 percent Medicare contribution tax on unearned income (the new tax is also imposed on estates and trusts, although slightly different rules apply). The tax is equal to 3.8 percent of the lesser of:
- Your net investment income (generally, net income from interest, dividends, annuities, royalties and rents, and capital gains, as well as income from a business that is considered a passive activity) or
- The amount of your modified adjusted gross income that exceeds $200,000 ($250,000 if married filing a joint federal income tax return, $125,000 if married filing a separate return)
So, effectively, you’re subject to the additional 3.8 percent tax only if your adjusted gross income exceeds the dollar thresholds listed above. It’s worth noting that interest on tax-exempt bonds is not considered net investment income for the purposes of the additional tax. Qualified retirement plan and IRA distributions are also not considered investment income.