US Capital Gains Tax
February 09, 2026
by Jeff Patterson
Reviewed by
Jeff Patterson is an American living in Scotland and joined the team at Expat Tax Online after experiencing the complexities of living abroad with a family.
Table of Contents
Capital Gains Tax for US Expats
Many capital gains guides are written with domestic taxpayers in mind. That framework does not always translate well for Americans living abroad. The core US capital gains rules remain the same. What changes is how those rules interact with foreign tax systems, currencies, and treaties once you live abroad.
Do US expats pay capital gains tax?
Yes. US citizens are taxed on worldwide income, including capital gains, no matter where they live. That applies whether the asset is in the US or overseas, including stocks, funds, crypto, property, and business interests. If you sell it at a profit, the US generally wants to know about it.
Living abroad does not remove this tax obligation. Instead, it adds extra layers, some helpful and some frustrating.
What is capital gains tax?
Capital gains tax is the tax on profit when you sell something for more than you paid for it. If you bought shares for US$5,000 and later sold them for US$8,000, the US$3,000 difference is the gain. That gain is what gets taxed.
Two ideas show up everywhere in capital gains rules:
- Cost basis: what you originally paid, adjusted for certain costs
- Realized gain: the profit only becomes taxable when you sell
Until you sell, the gain is unrealized. For individual investors, the IRS generally does not tax gains until an asset is sold.
Short-term vs long-term capital gains
The length of time you hold the asset determines how the gain is taxed and which tax rates apply.
- Short-term gains come from assets held one year or less
- Long-term gains come from assets held more than one year
Short-term gains are taxed like regular income. Long-term gains usually get lower rates. That difference alone can swing your tax bill by thousands of dollars. The holding period affects both the tax rate and the overall cost of selling an asset.
|
Holding period |
How the gain is taxed |
Why it matters for expats |
|
One year or less |
Ordinary income tax rates |
Often much higher than expected |
|
More than one year |
Preferential capital gains rates |
Planning timing can reduce tax |
2025 capital gains tax rates (filed in 2026)
For long-term capital gains, the US uses tiered rates based on taxable income, not where you live. Here are the federal long-term rates for the 2025 tax year.
Long-term capital gains rates
|
Filing status |
0% rate up to |
15% rate up to |
20% rate above |
|
Single |
US$48,350 |
US$533,400 |
Over US$533,400 |
|
Married filing jointly |
US$96,700 |
US$600,050 |
Over US$600,050 |
|
Head of household |
US$64,750 |
US$566,700 |
Over US$566,700 |
|
Married filing separately |
US$48,350 |
US$300,000 |
Over US$300,000 |
Rates and thresholds are inflation-adjusted annually.
A common misunderstanding is assuming these thresholds apply to the gain alone. They do not. The IRS combines your capital gains with your other taxable income to determine which tax rate applies.
Note: Some long-term capital gains are taxed at higher special rates. Certain real estate depreciation may be taxed at up to 25%, and gains from collectibles or specific small-business stock can be taxed at up to 28%.
Confused about capital gains tax rules? Connect with us today.
Does living abroad change capital gains tax?
The tax rates stay the same. The complications come from foreign taxes, currency rules, treaties, and additional surtaxes. Once you live outside the US, capital gains often intersect with:
- Foreign tax systems
- Currency conversion rules
- Tax treaties
- Additional surtaxes
This is where many expats get caught off guard. The US calculation might be straightforward on paper, but the real-world result can look very different.
Capital gains on foreign investments
Selling an investment outside the US does not change how the US treats the gain for tax purposes. The US still taxes it.
This applies to:
- Shares held in a non-US brokerage account
- Foreign mutual funds or ETFs
- Local investment products marketed to residents
Common foreign investment scenarios
|
Scenario |
What the US taxes |
Common mistake |
|
Selling foreign shares |
Capital gain in USD |
Assuming only local tax applies |
|
Selling foreign funds |
Capital gain (PFIC rules) |
Ignoring additional US tax rules that apply to certain foreign funds |
|
Using a foreign broker |
Capital gain |
Forgetting US reporting still applies |
Currency exchange can create “phantom” gains
This is one of the most misunderstood parts of expat capital gains. The US requires you to calculate gains in US dollars. This generally involves converting the purchase price and the sale price into USD using exchange rates from those dates.
If the local currency strengthens against the dollar while you hold the asset, you can end up with a taxable gain even if the local price barely moved.
Many expats first encounter this when selling property abroad. A transaction that appears reasonable under local tax rules can translate into a larger taxable gain once converted into US dollars.
This difference is common and should be anticipated when planning a sale.
Can US expats use the Foreign Tax Credit on capital gains?
In some cases, yes. In others, the credit is limited or unavailable. If a foreign country taxes the same capital gain, you may be able to claim a Foreign Tax Credit to reduce your US tax. Whether that works depends on:
- The type of asset
- The country involved
- How the gain is categorized under their local law
In some countries, capital gains are lightly taxed or even exempt from taxation. In others, they are heavily taxed. The mismatch can leave gaps that credits do not fully cover.
Do tax treaties protect US expats from capital gains tax?
Not in the way many people hope. Tax treaties can help in certain situations, but they rarely eliminate US capital gains tax entirely. The US taxes based on citizenship, and treaties rarely override that completely.
What treaties often do instead is allocate who taxes first or how credits apply.
Typical treaty outcomes
|
Situation |
What usually happens |
|
Selling investments |
US tax still applies |
|
Selling foreign property |
Local country often taxes first |
|
No treaty country |
Higher risk of double taxation |
Net Investment Income Tax (NIIT)
NIIT is an additional 3.8% tax on certain types of investment income, including capital gains. Many Americans abroad do not realize it exists until it appears on a tax return and increases their effective tax rate beyond what they expected.
The key point is this: NIIT is based on income level, not residency. Living overseas does not remove you from its scope.
What income does NIIT apply to?
For expats, NIIT most commonly applies to:
- Capital gains from selling investments
- Gains from selling property (including foreign property)
- Interest, dividends, and investment income not tied to active work
If the income is classified as investment income under US rules, NIIT often applies.
NIIT income thresholds
NIIT only applies once your income crosses certain levels. These thresholds are fixed and do not adjust for inflation.
- US$200,000 for single filers and Head of Household
- US$250,000 for married filing jointly and a qualifying widow(er) with a child
- US$125,000 for married filing separately
If your income exceeds the threshold, NIIT generally applies to the lesser of your net investment income or the amount by which your income exceeds the threshold.
How US expats report capital gains
Reporting capital gains follows the same US process whether you live in New York or New Zealand. The difference is that expats usually have to supply more of the details themselves.
Step 1: Each sale is reported and classified as short-term or long-term
Step 2: Gains and losses are totaled and summarized
Step 3: The totals are included on your US tax return
Special considerations for expats
- Foreign brokerage statements
These may use local currencies, local tax years, or reporting formats that do not match US requirements. - Property sales abroad
Foreign property transactions often require additional calculations, including currency conversion and adjustments to cost basis. - Estimated tax payments
Large capital gains can trigger a requirement to make estimated tax payments, even if you live outside the US. - Timing mismatches
Foreign tax years do not always line up with the US calendar year, which can complicate reporting and credit claims.
When capital gains planning matters most for expats
Some situations deserve extra attention before you sell.
- Selling property abroad
- Liquidating large investment portfolios
- Moving between countries with different tax systems
- Preparing for long-term life changes
At these moments, small timing or reporting decisions can affect your tax position for multiple future years.
FAQs
-
Do US expats pay capital gains tax to the US if the gain is small?
Yes. There is no minimum dollar threshold that exempts capital gains from US reporting. Even small gains must be reported. Whether tax is actually owed depends on your total taxable income and whether the gain falls into the 0% long-term capital gains bracket.
-
Are capital gains taxed differently if the asset was never connected to the US?
-
Does selling my primary home abroad qualify for the US home sale exclusion?
-
Can capital losses from foreign investments offset US capital gains?
-
Does renouncing US citizenship change how past capital gains are taxed?
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