Form 8960: Understanding the Net Investment Income Tax
Form 8960 is the IRS tax form used to calculate the 3.8% Net Investment Income Tax (NIIT) for individuals, estates, and trusts with investment income above fixed income thresholds. For the 2025 tax year filed in 2026, the individual thresholds remain $200,000 for single and head of household filers, $250,000 for married filing jointly, and $125,000 for married filing separately.
For US expats, Form 8960 can be a surprise because the Foreign Earned Income Exclusion does not make income disappear for NIIT threshold testing. TFX helps Americans abroad spot these cross-border issues before a return is filed.
The following 4 key takeaways explain when Form 8960 matters most:
- NIIT is a 3.8% tax on net investment income above specific thresholds.
- The thresholds are not indexed for inflation and have stayed at $200,000/$250,000 since NIIT began in 2013.
- For 2025 Form 1040 filings, the resulting tax is reported on Schedule 2 (Form 1040), line 12, not line 8.
- Expats must add back excluded foreign income from Form 2555 when checking whether they exceed the NIIT limits.
What is Form 8960, and why does it matter?
Form 8960 is how taxpayers calculate and report the Net Investment Income Tax (NIIT), a 3.8% tax imposed under Internal Revenue Code section 1411. The form matters because it applies to investment income, not wages, once MAGI exceeds the filing-status threshold.
Introduced under the Affordable Care Act, NIIT applies to individuals, estates, and trusts with significant investment income.
What is Form 8960 used for? The purpose of Form 8960 is to compare 2 numbers: your net investment income and the amount by which your MAGI exceeds the threshold. The rate?
A flat 3.8% on the lesser of:
- Net Investment Income (NII): Income from investments like interest, dividends, and rental income, reduced by eligible expenses.
- Modified Adjusted Gross Income (MAGI): For NIIT, MAGI generally starts with AGI, then adds back the foreign earned income exclusion adjustment and certain CFC/PFIC adjustments where applicable.
What is the purpose of Form 8960? Form 8960 prevents taxpayers from applying NIIT to all investment income when only part of that income exceeds the threshold. That is why the 8960 tax form is a calculation form, not just an attachment.
Do you need to file Form 8960?
You need to file Form 8960 if you have net investment income and your MAGI is above the applicable threshold for your filing status. The IRS says to attach Form 8960 to your return when MAGI is greater than the relevant threshold amount.
What triggers IRS Form 8960? IRS Form 8960 is triggered by 2 conditions: at least $1 of net investment income and MAGI above your filing-status threshold. A taxpayer with $270,000 MAGI and $90,000 passive partnership income would calculate NIIT on $70,000 because that is the smaller amount.
Thresholds for individuals
The individual Form 8960 threshold is fixed at $200,000 for single and head of household filers, $250,000 for married filing jointly, and $125,000 for married filing separately. These thresholds are not indexed for inflation, so the same dollar limits apply for 2025 returns filed in 2026.
The following 3 thresholds apply to individual taxpayers:
- $200,000: Single or Head of Household
- $250,000: Married Filing Jointly or Qualifying Surviving Spouse
- $125,000: Married Filing Separately
Estates and trusts
For estates and trusts, Form 8960 uses the dollar amount where the highest estate and trust tax bracket begins: $15,650 for the 2025 tax year and $16,000 for the 2026 tax year. The old $14,450 figure should be removed because it does not apply to 2025 returns filed in 2026.
Estates and trusts should also review foreign asset classifications carefully. Foreign funds may create PFIC tax and reporting issues, and excluded wages under the Foreign Earned Income Exclusion can still affect MAGI for NIIT testing.
Expat specifics: CFCs, PFICs, and the FEIE trap
For NIIT purposes, MAGI starts with AGI and then adds back the Foreign Earned Income Exclusion, including the 2025 FEIE amount of up to $130,000. This FEIE add-back can push an expat above the $200,000 or $250,000 threshold even when most wages were excluded on Form 2555.
A CFC is generally a foreign corporation more than 50% owned by US shareholders, while a PFIC generally meets a 75% passive-income test or a 50% passive-asset test. Income from CFCs and PFICs, especially QEF inclusions, can require Form 8960 line 6 adjustments even when no cash was distributed.
Based on our client scenario at TFX: A married expat excludes $130,000 of foreign wages on Form 2555 and has $140,000 of dividends and capital gains. Their regular AGI may look like $140,000, but their NIIT MAGI can be $270,000 before other adjustments, putting them $20,000 above the $250,000 married filing jointly threshold.
What counts as net investment income?
Net investment income generally includes interest, dividends, annuities, royalties, rents, passive business income, and net gains from selling property not held in a non-passive trade or business. Wages, Social Security, tax-exempt interest, certain retirement distributions, and self-employment income are generally excluded from NII.
The following 6 income categories commonly count as net investment income:
- Interest from savings accounts, CDs, and taxable bonds
- Dividends from stocks, ETFs, and mutual funds
- Capital gains from selling investments or second homes
- Rental income when the activity is passive
- Royalty income from intellectual property or natural resources
- Passive business income, including some partnership or S corporation income
The following 4 income categories generally do not count:
- Wages or self-employment income
- Social Security benefits
- Tax-exempt interest income
- Distributions from qualified retirement plans, including many IRAs and 401(k)s
Form 8960 is the federal investment income tax form for NIIT, but it is not a general investment income form for every taxpayer with dividends or capital gains. The NIIT form matters only when net investment income combines with MAGI above the threshold.
Breaking down Form 8960 instructions
Form 8960 instructions divide the 2025 form into 3 parts: investment income, investment expenses, and tax computation. The official Form 8960 PDF is 1 page, but the line instructions are detailed because CFCs, PFICs, rentals, and pass-through entities may need special adjustments.
The IRS 8960 instructions should be used with the return itself, not as a stand-alone estimate.
Part I: Investment income
Part I of Form 8960 reports investment income on lines 1 through 8, including taxable interest, ordinary dividends, annuities, rental real estate, royalties, pass-through income, gains, and CFC/PFIC adjustments. Line 8 totals investment income before Part II deductions.
Based on our client scenario at TFX: A US expat in Singapore has $30,000 of ordinary dividends, $12,000 of capital gain, and a $5,000 PFIC mark-to-market inclusion. Part I may start with $47,000 of potential NII before any properly allocable deductions.
The official Form 8960 PDF can also function as a Form 8960 worksheet for reviewing the flow of the calculation, but complex CFC and PFIC cases usually need the full instructions for IRS Form 8960.
Part II: Deductions
Part II of Form 8960 reduces investment income by properly allocable expenses on lines 9a through 11. These may include investment interest expense and state, local, and foreign income tax allocable to net investment income.
Form 8960 state income tax deduction: State, local, and foreign income taxes may be deducted on line 9b only to the extent they are properly allocable to NII. This is different from using the Foreign Tax Credit to reduce NIIT.
The following 3 deduction categories appear in Part II:
- Investment interest expense
- State, local, and foreign income tax allocable to investment income
- Miscellaneous investment expenses allowed under the NIIT rules
Part III: Tax computation
Part III calculates the Form 8960 tax on the smaller of net investment income or the amount by which MAGI exceeds the threshold. For individuals, line 17 is the final NIIT amount, and for 2025 Form 1040 filers, it flows to Schedule 2 (Form 1040), line 12.
Based on our client scenario at TFX: A married couple filing jointly has $300,000 of MAGI and $40,000 of NII. Their MAGI exceeds the $250,000 threshold by $50,000, so Form 8960 applies 3.8% to $40,000, creating a $1,520 NIIT.
Forms 8959 and 8960 both relate to Medicare-related taxes, but they are not interchangeable. Form 8959 reports Additional Medicare Tax on wages and self-employment income, while Form 8960 reports the 3.8% tax on net investment income.
Form 8960 preview
NIIT thresholds vs. income types
NIIT thresholds determine whether Form 8960 is required, but the income type determines whether the amount is included in NII. Rental income is not automatically exempt: passive rentals usually count, while non-passive rental income may be excluded when the taxpayer materially participates or qualifies as a real estate professional under the passive activity rules.
The key rule is that NIIT applies only when both conditions are met: MAGI exceeds the threshold, and the income is included in net investment income.
| Category | Threshold or rule | Subject to NIIT? |
|---|---|---|
| Single or Head of Household | $200,000 MAGI | Yes, on the smaller of NII or excess MAGI |
| Married Filing Jointly | $250,000 MAGI | Yes, on the smaller of NII or excess MAGI |
| Married Filing Separately | $125,000 MAGI | Yes, on the smaller of NII or excess MAGI |
| Retirement plan distributions | No NIIT threshold test if excluded from NII | Generally no for qualified plan distributions |
| Rental income | Passive activity rules apply | Yes if passive; may be excluded if non-passive, including some real estate professional cases |
| CFC and PFIC income | Line 6 adjustments may apply | Often yes, depending on elections and inclusions |
A federal tax Form 8960 review should focus on both sides of the table: the Form 8960 threshold and the character of the income. That is why a form for investment income can produce no NIIT in one case and a large 8960 net investment income tax in another.
Key strategies to reduce NIIT liability
The best NIIT strategies reduce either net investment income or MAGI before the 3.8% calculation is applied. Expats in high-tax countries, including France or the UK, should also check whether a treaty position may affect NIIT, but the default rule is that the Foreign Tax Credit generally cannot offset NIIT.
Certain treaty-based claims remain limited and fact-specific. Recent court decisions involving France and Canada have produced taxpayer-favorable results in some circumstances, while other treaty claims have failed, so a treaty position should be reviewed before filing.
1. Harvest capital losses
Tax-loss harvesting can reduce NII by offsetting capital gains before the 3.8% NIIT is calculated. For regular federal tax purposes, up to $3,000 of net capital loss may offset ordinary income each year, with unused losses generally carried forward.
Selling underperforming taxable investments before December 31 may reduce the net capital gain reported on Form 8960. Wash sale rules and foreign fund classification should be checked before selling and repurchasing similar assets.
2. Invest in tax-exempt securities
Tax-exempt interest is generally excluded from NII, which can make municipal bonds useful for taxpayers near the $200,000 or $250,000 thresholds. The benefit depends on yield, state residency, currency exposure, and whether the bond has alternative minimum tax implications.
This strategy is most useful when taxable bond interest would otherwise increase both MAGI and NII. Expats should also consider whether local country tax rules treat the same interest differently.
3. Contribute to retirement accounts
Pre-tax retirement contributions can reduce MAGI, which may reduce or eliminate the amount above the NIIT threshold. A 401(k), IRA, or SEP IRA contribution can matter when MAGI is close to $200,000, $250,000, or $125,000.
The strategy works best when the taxpayer is still eligible to contribute, and the contribution is deductible or excluded from current wages. Foreign pension contributions may not receive the same US treatment as US-qualified retirement accounts.
4. Monitor rental property expenses
Rental expenses such as repairs, depreciation, property management fees, mortgage interest, and local taxes can reduce net rental income before Form 8960 is finalized. A rental that looks profitable before depreciation may produce lower NII after properly allocable expenses.
Material participation also matters. If the rental activity is non-passive and the taxpayer qualifies as a real estate professional, the income may be outside NIIT.
5. Optimize income timing
Deferring a capital gain, bonus, Roth conversion, or major investment sale by even 1 tax year can change whether MAGI exceeds a threshold. This is especially important when projected MAGI is within $10,000 to $25,000 of the NIIT cutoff.
Taxpayers should compare the current-year NIIT cost with future-year tax rates, currency movement, and local-country tax timing. A delay that reduces US NIIT can still create a worse result abroad.
Bottom line
Form 8960 is a small form with a large impact: a 3.8% tax on the smaller of net investment income or excess MAGI. For 2025 returns filed in 2026, the main individual thresholds remain $200,000, $250,000, and $125,000, while the estate and trust threshold is $15,650.
The expat-specific risk is that excluded foreign earned income, CFC income, PFIC income, and treaty positions can change the result. If your return includes Form 2555, Form 8621, a foreign corporation, or rental income, review the NIIT calculation before filing.
Need help checking whether Form 8960 applies to your expat return? Start with a TFX tax consultation so the issue is reviewed before your return is submitted.
FAQ
Generally, no. The IRS says foreign income tax credits under sections 27 and 901 generally cannot reduce NIIT because they apply to Chapter 1 regular income tax, while NIIT is imposed under Chapter 2A. Some treaty-based claims, including France-related litigation, may create rare exceptions, so review the treaty before relying on a credit.
Individuals must pay NIIT if they have net investment income and MAGI above $200,000 for single or head of household, $250,000 for married filing jointly, or $125,000 for married filing separately. These thresholds are not indexed for inflation.
Yes, taxpayers can legally reduce NIIT exposure by reducing NII or MAGI. Common methods include tax-loss harvesting, tax-exempt municipal bonds, shifting income from passive to non-passive business activities, increasing deductible retirement contributions, and timing capital gains across tax years.
For the 2025 tax year filed in 2026, NIIT remains in effect at 3.8% with the same individual thresholds. The IRS Form 8960 page lists no recent developments, and the current 2025 form still uses line 17 for individuals and line 21 for estates and trusts.
Life insurance death benefits are generally not taxable and usually are not NII, but interest earned on those proceeds can be taxable. Inherited assets are not automatically subject to NIIT at inheritance, but income generated later by an inherited portfolio may count, and taxable distributions from inherited IRAs can affect MAGI.
No. Passive rental income generally counts, but rental income may be excluded when it is part of a non-passive trade or business. A taxpayer who materially participates or qualifies as a real estate professional may avoid NIIT on that rental income, depending on the facts.
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