Key Takeaways
- Income from investments minus allowable expenses.
- Includes interest, dividends, capital gains, rental income.
- Subject to 3.8% Net Investment Income Tax above income thresholds.
- Excludes wages, qualified retirement distributions, and tax-exempt interest.
What is Net Investment Income (NII)?
Net Investment Income (NII) refers to income earned from investments such as interest, dividends, capital gains, rental income, and royalties, less allowable deductions. It is a critical figure used to calculate the Net Investment Income Tax (NIIT), which applies to taxpayers with high incomes.
NII excludes wages, most active business income, and distributions from qualified retirement accounts, focusing specifically on passive investment returns.
Key Characteristics
Understanding the main features of NII helps you identify applicable income sources and tax implications:
- Income Sources: Includes dividends, interest (excluding tax-exempt), capital gains, rental and royalty income, and non-qualified annuities.
- Deductions: Investment expenses like advisory fees and interest on investment debt reduce NII.
- Tax Application: NIIT is a 3.8% surtax on the lesser of your NII or the excess of your modified adjusted gross income over set thresholds.
- Exclusions: Social Security benefits, qualified retirement plan distributions, and tax-exempt interest do not count as NII.
- Thresholds: Filing status affects the income thresholds where NIIT begins to apply.
How It Works
Net Investment Income is calculated by totaling all investment income and subtracting allowable deductions. This net figure is then compared against your modified adjusted gross income (MAGI) to determine if the NIIT applies.
The NIIT is charged at 3.8% on the lesser amount between your NII and the excess of your MAGI over the specified thresholds. This tax is reported annually on IRS Form 8960 alongside your regular income tax filing.
Examples and Use Cases
Here are some practical examples of how NII and NIIT affect different taxpayers:
- Airlines: Investors holding shares in companies like Delta or American Airlines may receive dividends and capital gains that contribute to their NII.
- Dividend Income: If you focus on best dividend stocks or best dividend ETFs, dividends received will increase your NII, potentially triggering NIIT.
- Capital Gains: Selling investments for a profit generates capital gains that add to NII and influence your tax liability.
Important Considerations
When managing your investments, be mindful that NII impacts your overall tax burden, especially if your income exceeds NIIT thresholds. Planning strategies may include tax-loss harvesting or adjusting your portfolio to manage income types.
Consulting with a tax professional is advisable to navigate complexities and optimize your tax position in light of macroeconomics and personal circumstances.
Final Words
Net Investment Income (NII) directly impacts your potential exposure to the 3.8% Net Investment Income Tax, especially if your modified adjusted gross income exceeds IRS thresholds. Review your investment income sources and deductions carefully to estimate your NIIT liability and consider consulting a tax professional to optimize your tax strategy.
Frequently Asked Questions
Net Investment Income (NII) is the income you earn from investments such as interest, dividends, capital gains, rental and royalty income, and non-qualified annuities, after subtracting allowable deductions and expenses.
NII includes interest income (excluding tax-exempt interest), dividends, capital gains, rental and royalty income, passive business income, and distributions from non-qualified annuities.
Income like wages, self-employment earnings, distributions from qualified retirement plans, Social Security benefits, alimony, unemployment compensation, tax-exempt interest, and gains on the sale of a primary residence within exclusion limits are excluded from NII.
NIIT is a 3.8% tax applied to the lesser of your total NII or the amount by which your modified adjusted gross income (MAGI) exceeds specified thresholds based on your filing status.
The thresholds are $250,000 for married filing jointly or surviving spouse, $125,000 for married filing separately, $200,000 for single or head of household filers, and $250,000 for qualifying widow(er) with a dependent child.
Individuals, estates, and trusts with income above the threshold levels and with NII must report and pay NIIT using Form 8960, which is filed along with Form 1040.
Allowable deductions such as investment interest expense, advisory fees, and certain state taxes reduce your gross investment income to calculate your net investment income.
For example, a single filer with a MAGI of $270,000 and NII of $90,000 has $70,000 over the $200,000 threshold. NIIT applies to $70,000, resulting in a tax of $2,660 (3.8% of $70,000).


