Living outside the United States does not automatically shield you from U.S. tax obligations. U.S. tax law treats several categories of people and entities as “U.S. persons,” subject to worldwide‑income tax filing and reporting, even when they never set foot on American soil.
Who is a U.S. person for tax purposes?
| Category | Tax consequence |
|---|---|
| U.S. citizens (by birth or naturalisation) | Must file U.S. income‑tax returns on worldwide income, regardless of residence. |
| Green‑card holders (lawful permanent residents) | Treated the same as citizens. They are expected to live in the U.S.; prolonged absence can trigger an “exit tax” if the green card is surrendered after eight years or more. |
| Individuals meeting the Substantial Presence Test | If, over a three‑year rolling period, the weighted sum of days in the U.S. exceeds 183 (current year + 1⁄3 of the prior year + 1⁄6 of the year before), they are deemed U.S. residents for tax purposes. Roughly 120 days per year keeps most people below the threshold. |
| Dual‑citizenship does not exempt | Holding a second passport does not change U.S. tax status; the United States taxes you as long as you retain U.S. citizenship. |
Key reporting requirements
- Foreign Financial Account Reporting (FBAR – FinCEN Form 114) – Required if the aggregate value of foreign bank, brokerage, crypto, or other financial accounts exceeds $10,000 at any time during the year.
- FATCA (Form 8938) – Must be filed with the tax return for certain foreign assets exceeding specified thresholds ($50,000 for single filers, higher for married filing jointly).
- Foreign corporation, partnership, trust, and LLC disclosures – Forms 5471, 8865, 3520, 3520‑A, etc., may be required when you own or control foreign entities.
- U.S. estate tax exposure – Non‑resident aliens receive a $60,000 exemption; U.S. persons receive a $12.06 million exemption (2024). Holding U.S. real estate, brokerage accounts, or private‑equity interests can trigger estate‑tax liability if not properly structured.
Common misconceptions and pitfalls
-
“I’m not a citizen, so I’m safe.”
Green‑card holders and anyone who passes the Substantial Presence Test are taxed on worldwide income and must file the same returns as citizens. -
“A second passport is a tax escape hatch.”
The United States looks at citizenship, not the number of passports. Renouncing U.S. citizenship is the only way to eliminate U.S. tax liability, and it carries its own exit‑tax rules. -
“Living in Puerto Rico eliminates all U.S. taxes.”
Bona‑fide residents of Puerto Rico can benefit from Act 60 (formerly Acts 20/22), which reduces Puerto Rican income and capital‑gains tax. However, they remain U.S. taxpayers for any U.S.‑source income, U.S.‑based businesses, and required foreign‑account reporting. -
“Selling to U.S. customers or shipping from abroad is tax‑free.”
A foreign entity that has a U.S. “nexus” – e.g., U.S. employees, a U.S. office, or U.S.‑sourced income – may need to file a U.S. corporate return (Form 1120‑F) and pay tax on effectively connected income.
Practical steps to stay compliant
- Track U.S. days meticulously. Use a calendar or app to ensure you stay below the Substantial Presence threshold if you intend to remain a non‑resident for tax purposes.
- Conduct pre‑arrival planning for green‑card holders. Evaluate the potential exit‑tax impact before relinquishing a green card after long‑term residence.
- Review tax treaties. Some countries have treaties that reduce or eliminate U.S. tax on certain income types; the treaty’s “tie‑breaker” rules determine residency for treaty purposes.
- Structure foreign businesses and assets deliberately. Offshore corporations, trusts, and LLCs must be reported, but proper structuring can limit U.S. tax exposure.
- Seek qualified U.S. tax counsel. Many domestic accountants lack expertise in international reporting (FBAR, FATCA, foreign entity filings). Specialized CPAs or tax attorneys are essential for high‑net‑worth individuals.
- Consider estate‑tax planning. If you own U.S. assets, explore ownership through foreign entities or trusts to mitigate the low non‑resident exemption.
Summary
U.S. tax liability extends beyond citizens to green‑card holders, individuals meeting the Substantial Presence Test, and anyone with U.S.‑source income or assets. Compliance involves not only filing income returns but also a suite of information‑reporting obligations (FBAR, FATCA, foreign‑entity disclosures) and potential estate‑tax exposure. Proper day‑count tracking, pre‑emptive planning for green‑card holders, careful use of tax treaties, and professional guidance are essential to avoid unexpected taxes and penalties.
