US expats generally owe the 3.8% Net Investment Income Tax (NIIT) if they have investment income and their modified adjusted gross income exceeds $200,000 for single filers or $250,000 for married couples filing jointly.
The tax applies to the lesser of net investment income or income above the threshold and is calculated on Form 8960.
Americans living abroad may face an additional US tax on investment income, even when they already pay taxes in their country of residence.
The Net Investment Income Tax (NIIT) is a 3.8% federal tax that applies to certain investment earnings of higher-income taxpayers. It can affect dividends, interest, capital gains, rental income, and other investments held in the United States or overseas.
For US expats, the rules can be particularly challenging. Foreign investment income generally remains subject to US taxation, and common expat tax benefits do not necessarily eliminate the additional 3.8% tax.
Key Takeaways: Net Investment Income Tax for US Expats
-
Tax rate: NIIT is an additional 3.8% tax on certain investment income.
-
Income thresholds: The tax generally applies when modified adjusted gross income exceeds $200,000 for single filers or $250,000 for joint filers.
-
Foreign investments: Income from foreign stocks, funds, and other investments may be subject to NIIT.
-
Expat tax benefits: The Foreign Earned Income Exclusion does not automatically eliminate NIIT, and foreign tax credits generally cannot offset it.
-
Reporting: Taxpayers calculate NIIT using IRS Form 8960.
NIIT Rules for Americans Living Abroad
| Category | General rule |
|---|---|
| Tax rate | 3.8% |
| Single filers | $200,000 MAGI threshold |
| Married filing jointly | $250,000 MAGI threshold |
| Married filing separately | $125,000 MAGI threshold |
| Head of household | $200,000 MAGI threshold |
| Qualifying surviving spouse | $250,000 MAGI threshold |
| Reporting form | IRS Form 8960 |
| Foreign investments | Generally included if they produce qualifying investment income |
| Foreign tax credit | Cannot directly offset NIIT |
These income thresholds are not adjusted annually for inflation.
What is the Net Investment Income Tax?
The Net Investment Income Tax is an additional federal tax introduced in 2013 under Internal Revenue Code Section 1411.
According to the IRS, it applies to certain investment income earned by individuals whose modified adjusted gross income (MAGI) exceeds specified thresholds.
Unlike regular federal income tax, NIIT is calculated separately and applies only to qualifying net investment income.
For example, an American living in Finland might owe regular US income tax on dividends from an investment portfolio. If their income exceeds the applicable threshold, they could also owe the additional 3.8% tax.
NIIT generally applies to US citizens and resident aliens regardless of where they live.
Nonresident aliens are generally exempt, although special rules apply to dual-status taxpayers and certain married couples who elect joint filing treatment.
Which Types of Investment Income Are Subject to NIIT?
NIIT generally covers income generated from investments rather than wages or active employment.
Common types of income subject to the tax include:
| Investment income | Generally subject to NIIT? |
|---|---|
| Stock dividends | Yes |
| Bank interest | Yes |
| Capital gains from investments | Yes |
| Passive rental income | Yes |
| Certain royalties and annuities | Yes |
| Wages and salaries | No |
| Social Security benefits | No |
| Qualified retirement plan distributions | No |
| Most active business income | No |
Some investment expenses and losses may reduce net investment income, subject to specific deduction rules.
Foreign Stocks, ETFs, and Investment Funds
Americans holding foreign stocks, exchange-traded funds, or mutual funds may owe NIIT on qualifying dividends and investment gains.
Foreign investments can also create separate US reporting obligations.
For example, certain foreign mutual funds may be classified as Passive Foreign Investment Companies (PFICs), potentially requiring Form 8621 reporting.
PFICs and controlled foreign corporations may also require special NIIT calculations, including adjustments for certain income inclusions and distributions.
Foreign Rental Properties
Rental income from property outside the United States may also be subject to NIIT.
For example, an American living in Spain who earns passive rental income from an apartment in France may need to include the net rental earnings when calculating NIIT.
However, income from certain nonpassive rental businesses may receive different treatment.
The classification depends on the taxpayer’s activities and applicable US tax rules, not simply where the property is located.
How is the 3.8% Net Investment Income Tax Calculated?
NIIT is calculated using the smaller of:
- Your net investment income for the tax year.
- The amount by which your modified adjusted gross income exceeds the applicable filing-status threshold.
The result is multiplied by 3.8%.
Example: American Expat With Investment Income
Suppose a single American living in the United Kingdom has the following annual income:
| Income source | Amount |
|---|---|
| Employment income | $180,000 |
| Dividend income | $30,000 |
| Capital gains | $20,000 |
| Total MAGI | $230,000 |
Assume no exclusions, adjustments, or deductible investment expenses apply.
The taxpayer’s net investment income is $50,000.
Their MAGI exceeds the $200,000 threshold by $30,000.
Because $30,000 is smaller than $50,000, the tax calculation is:
$30,000 × 3.8% = $1,140
The taxpayer owes $1,140 in NIIT in addition to any regular US income tax liability.
If the taxpayer’s MAGI were below $200,000, no NIIT would apply, even if they received investment income.
Close to the NIIT Threshold?
Universal Tax Professional can review your MAGI, investment income, and FEIE add-backs to see whether the 3.8% tax applies and how to plan around it.
Does the Foreign Earned Income Exclusion Reduce NIIT?
One of the most important considerations for US expats is how the Foreign Earned Income Exclusion (FEIE) affects the NIIT calculation.
The FEIE allows eligible Americans abroad to exclude a qualifying amount of foreign earned income from regular US federal income tax.
However, excluded foreign earned income is generally added back when calculating MAGI for NIIT purposes, with applicable adjustments for related deductions.
This means an expat may qualify for the FEIE and still exceed the NIIT income threshold.
Example: Excluded Foreign Salary and Investment Income
Suppose a single American working in Singapore has:
- $180,000 in foreign employment income.
- $40,000 in dividend income.
- A valid FEIE election excluding part of their salary.
Although the FEIE reduces their regular taxable income, the excluded earnings are generally added back for the NIIT MAGI calculation.
Assuming no other adjustments, their NIIT MAGI is $220,000.
The excess over the single-filer threshold is $20,000.
Their NIIT would therefore be:
$20,000 × 3.8% = $760
The Foreign Earned Income Exclusion can reduce regular income tax, but it does not automatically protect investment income from NIIT.
Can the Foreign Tax Credit Offset NIIT?
Generally, no. The Foreign Tax Credit (FTC) helps prevent double taxation by allowing eligible foreign income taxes to offset certain US federal income taxes.
However, the credit generally applies to regular federal income tax rather than the separate Net Investment Income Tax.
Consequently, an American living abroad may owe NIIT even when foreign tax credits eliminate their regular US income tax liability.
For example, an American in France may pay French income tax on investment earnings and claim an allowable US foreign tax credit.
That credit cannot directly reduce the 3.8% NIIT.
Certain foreign income taxes may instead be deductible when calculating net investment income, subject to the relevant rules and restrictions. Taxpayers generally cannot claim the same foreign tax as both a credit and a deduction.
How to Report Net Investment Income Tax on Your US Tax Return
Taxpayers calculate and report NIIT using IRS Form 8960, which accompanies their federal income tax return.
Step 1: Determine Your Modified Adjusted Gross Income
Calculate your adjusted gross income and make the adjustments required for NIIT purposes.
These may include adding back excluded foreign earned income and accounting for certain foreign investment interests.
Step 2: Identify Your Net Investment Income
Review your taxable interest, dividends, capital gains, rental income, and other potentially qualifying investment earnings.
Subtract applicable investment losses and allowable expenses under NIIT rules.
Step 3: Calculate the Additional Tax
Compare your net investment income with the amount by which your MAGI exceeds the relevant threshold.
Multiply the smaller amount by 3.8%.
Step 4: Complete Form 8960
Report the calculation on Form 8960.
Any resulting NIIT liability flows through Schedule 2 and becomes part of your total federal tax liability on Form 1040.
Taxpayers expecting significant NIIT liability may also need to adjust estimated tax payments to avoid underpayment penalties.
Plan Around the 3.8% Tax
Our team prepares Form 8960 for Americans abroad and helps time gains, losses, and payments to limit NIIT.
Can US Expats Reduce Their NIIT Liability?
Although living abroad does not provide an automatic NIIT exemption, certain tax planning strategies may help manage the liability.
Potential considerations include:
- Managing capital gains: The timing of investment sales may affect whether MAGI exceeds the NIIT threshold.
- Reviewing investment losses: Eligible capital losses may offset gains included in net investment income.
- Evaluating retirement accounts: Distributions from certain qualified retirement plans are generally excluded from net investment income, although they may increase MAGI.
- Reviewing deductible expenses: Properly allocable investment expenses may reduce the amount subject to NIIT.
These strategies depend on the taxpayer’s overall financial circumstances, and some may have consequences under foreign tax law.
