Cross-border tax compliance is the set of U.S. federal obligations that apply when your income, accounts, or investments touch more than one country. If you are a U.S. citizen or resident alien, you owe federal income tax on your worldwide income no matter where you live or where the money is earned, and you must file information returns disclosing foreign accounts, foreign entities, and certain gifts once they cross specific dollar thresholds. Missing a single required form can trigger penalties starting at $10,000, and foreign banks now send account data directly to the IRS, so the agency often knows what you hold before you file.{1Internal Revenue Service. Summary of FATCA Reporting for U.S. Taxpayers
Who the Rules Apply To
Two tests decide whether the IRS treats you as a U.S. tax resident, and meeting either one means you report worldwide income.
The Green Card Test is simple: if you hold a lawful permanent resident card, you are a U.S. tax resident. That status continues until the card is formally surrendered or revoked, even after you move abroad.
The Substantial Presence Test counts physical days across three years. Add all days in the current year, one-third of days from the prior year, and one-sixth of days from two years back. If the total reaches 183, you are a resident for that tax year.{2Internal Revenue Service. U.S. Citizens and Resident Aliens Abroad
Passing that day count does not always lock you in. If you were present fewer than 183 days in the current year, kept a tax home in a foreign country all year, and had stronger personal and economic ties to that country than to the United States, you can claim the closer-connection exception by filing Form 8840 with your return. One hard limit: you cannot claim it if you have applied for or hold a pending green card application.{3Internal Revenue Service. Closer Connection Exception to the Substantial Presence Test
When two countries both claim you, bilateral tax treaties include tie-breaker rules that look at where you keep a permanent home, where your closest ties are concentrated, and where you habitually live. Nationality or a mutual agreement between the two governments settles anything the earlier factors leave open.
Reporting Foreign Accounts
Foreign account reporting is the most common trigger for cross-border filings, and it carries the steepest penalties. Two separate forms cover overlapping ground.
FBAR (FinCEN Form 114)
If the combined value of your foreign financial accounts exceeds $10,000 at any point during the year, you must file a Report of Foreign Bank and Financial Accounts with FinCEN.{4Office of the Law Revision Counsel. 31 USC 5314 – Records and Reports on Foreign Financial Agency Transactions The threshold is aggregate. Three accounts of $4,000 each cross it. The requirement covers bank accounts, brokerage accounts, mutual funds, and insurance policies with cash value held at foreign institutions.
Filing is electronic through the BSA E-Filing System. You will need the maximum value of each account during the year, the account number, and the name and address of each institution.{5Financial Crimes Enforcement Network. How Do I File the FBAR? The FBAR is due April 15, with an automatic extension to October 15 that requires no request.
Cryptocurrency held in a foreign account catches people off guard. Under current FinCEN guidance, a foreign account holding only virtual currency is not reportable on the FBAR. FinCEN has said it intends to amend the regulations, but until new rules are finalized, no FBAR is required for accounts that hold nothing besides crypto.{6Financial Crimes Enforcement Network. Notice 2020-2 – Report of Foreign Bank and Financial Accounts Filing Requirement for Virtual Currency An account holding both crypto and traditional assets is still reportable based on the traditional assets.
Penalties are severe. The Supreme Court held in Bittner v. United States that a non-willful penalty accrues per report, not per account.{7Supreme Court of the United States. Bittner v. United States The base statutory maximum for a non-willful violation is $10,000, adjusted annually for inflation. A willful violation carries the greater of $100,000 or 50 percent of the account balance at the time of the violation.{8Office of the Law Revision Counsel. 31 USC 5321 – Civil Penalties
Form 8938
Form 8938 goes with your income tax return and reaches a broader category of assets than the FBAR: foreign stock or securities held directly (not through a U.S. brokerage), interests in foreign entities, and financial instruments issued by a foreign person or institution. The thresholds depend on filing status and where you live:
- Single, living in the U.S.: value over $50,000 on the last day of the year or $75,000 at any point.
- Married filing jointly, living in the U.S.: over $100,000 on the last day or $150,000 at any point.
- Single, living abroad: over $200,000 on the last day or $300,000 at any point.
- Married filing jointly, living abroad: over $400,000 on the last day or $600,000 at any point.
{9Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets?
Failing to file Form 8938 costs $10,000, plus $10,000 for every 30 days the failure continues after the IRS sends a notice, up to $50,000 in additional penalties.{10Office of the Law Revision Counsel. 26 USC 6038D – Information With Respect to Foreign Financial Assets Many accounts are reportable on both forms, since FinCEN and the IRS collect overlapping but not identical information.
Interests in Foreign Entities, Trusts, and Large Gifts
Owning a stake in a foreign business, receiving a large gift from abroad, or holding foreign mutual funds each triggers a separate information return, filed with your income tax return.
Foreign Corporations (Form 5471)
If you control a foreign corporation (more than 50 percent of voting power or value) or hold 10 percent or more of a controlled foreign corporation, you file Form 5471. The penalty is $10,000 per corporation per year, plus $10,000 for each 30-day period the failure continues after IRS notice, up to $60,000 per form.{11Internal Revenue Service. Instructions for Form 5471
Foreign Partnerships (Form 8865)
Form 8865 covers U.S. persons who control a foreign partnership (over 50 percent), hold at least 10 percent when U.S. persons collectively control it, contribute property worth over $100,000, or cross the 10 percent threshold through acquisition or disposition.{12Internal Revenue Service. Instructions for Form 8865 Penalties track Form 5471: $10,000 per partnership per year with continuation penalties up to $50,000. Unreported property contributions carry a 10 percent penalty on fair market value, capped at $100,000 unless the failure was intentional.
Foreign Trusts and Gifts (Form 3520)
A gift or bequest from a foreign individual or estate totaling more than $100,000 in a tax year requires Form 3520. Gifts from foreign corporations or partnerships have a lower threshold of $20,573 for 2026.{13Internal Revenue Service. Gifts From Foreign Person Creating a foreign trust, transferring property to one, or receiving distributions from one also triggers Form 3520. The penalty is the greater of $10,000 or 35 percent of the gross reportable amount.
Passive Foreign Investment Companies (Form 8621)
If you own shares in a passive foreign investment company, you generally file Form 8621 with your return. Most foreign-based mutual funds qualify as PFICs, which surprises expats who invest through local fund platforms. A de minimis exception lets you skip Part I if your total PFIC holdings are $25,000 or less on the last day of the year ($50,000 for joint filers) and you did not receive an excess distribution or sell shares.{14Internal Revenue Service. Instructions for Form 8621
Reporting Foreign Income and Avoiding Double Tax
Every dollar earned outside the United States goes on your tax return. Wages, self-employment income, interest, dividends, rent, royalties, and capital gains all belong there. Foreign-currency amounts must be converted to U.S. dollars using the exchange rate on the date the income was received, or the yearly IRS average for income received regularly through the year, such as a monthly salary. Keep pay stubs, foreign tax certificates, employer statements, bank statements, and sales contracts; reconstructing foreign records after an audit is far harder than pulling a domestic W-2.
Three mechanisms keep the same income from being taxed twice. Which works best depends on where you live, what you earn, and how heavily the other country taxes you.
Foreign Tax Credit
The foreign tax credit under IRC Section 901 lets you subtract income taxes paid to a foreign government directly from your U.S. tax bill.{15Office of the Law Revision Counsel. 26 USC 901 – Taxes of Foreign Countries and of Possessions of United States The credit is capped at the U.S. tax attributable to your foreign-source income, so it cannot erase tax owed on domestic earnings. The foreign tax must be a legally imposed income tax that you actually paid or accrued. Excess credits carry forward up to 10 years.
Watch out at the state level. Most states do not allow a credit for taxes paid to foreign countries against state income tax; state credits generally cover only taxes paid to other U.S. states. In a state with an income tax, you can end up paying both the foreign tax and full state tax on the same income even when the federal side is settled.
Foreign Earned Income Exclusion
If you live and work abroad, you can exclude up to $132,900 of foreign earned income from your 2026 federal return under IRC Section 911.{16Office of the Law Revision Counsel. 26 USC 911 – Citizens or Residents of the United States Living Abroad{17Internal Revenue Service. Figuring the Foreign Earned Income Exclusion The amount adjusts annually for inflation. You qualify by meeting either the bona fide residence test (residing in a foreign country for an uninterrupted period covering a full tax year) or the physical presence test (physically in a foreign country for at least 330 full days during any 12-month period).
The exclusion applies only to earned income like wages and self-employment. It does not reach dividends, interest, or rental income. You can also exclude or deduct part of foreign housing costs, subject to a base limitation of $39,870 for 2026, with higher limits for specific high-cost locations such as Hong Kong and Geneva.{18Internal Revenue Service. Notice 2026-25
You must choose between the credit and the exclusion for the same income. Many expats use both: the exclusion for earned income and the credit for any remaining foreign-source income or for taxes paid on excluded income in high-tax countries. Getting the mix right is where most of the planning value lies.
Tax Treaties
The United States maintains income tax treaties with dozens of countries that assign primary taxing rights over specific types of income. Treaties commonly reduce withholding rates on dividends, interest, and royalties flowing between treaty countries, and they set the point at which a business presence in a foreign country creates a local tax obligation. A resident of a treaty country claims treaty benefits on the U.S. return using Form 8833.
FATCA and Automatic Information Sharing
The Foreign Account Tax Compliance Act requires foreign financial institutions to report accounts held by U.S. taxpayers directly to the IRS.{1Internal Revenue Service. Summary of FATCA Reporting for U.S. Taxpayers Banks, brokerage firms, investment funds, and certain insurance companies around the world are already sending your account information to U.S. tax authorities. FATCA runs alongside the Common Reporting Standard, a global framework through which over 100 countries exchange financial account information with each other. Your FBAR and Form 8938 obligations are the taxpayer-facing side of this same architecture, and the IRS often has the data before you file.
Social Security and Totalization Agreements
Working abroad can trigger social security taxes in two countries at once, because the United States imposes Social Security and Medicare taxes on U.S. citizens and residents regardless of where they work. The United States has totalization agreements with 30 countries, including most of Western Europe, Canada, Australia, Japan, and South Korea, to prevent that overlap.{19Social Security Administration. Status of Totalization Agreements
Under these agreements, you generally pay social security tax only in the country where you are working. If your employer sends you abroad temporarily (usually five years or less), you typically stay in the U.S. system. To claim the exemption from the foreign country’s system, you need a Certificate of Coverage from the Social Security Administration, which your employer presents to the foreign tax authority.{20Internal Revenue Service. Totalization Agreements The agreements also let you combine work credits from both countries to qualify for retirement benefits you otherwise could not.
In a country without a totalization agreement, you can owe social security taxes to both governments on the same earnings, with no credit mechanism to offset the overlap.
Filing Deadlines
The standard April 15 federal deadline applies to all international information returns filed with your income tax return, including Forms 8938, 5471, 8865, 3520, and 8621. If you live outside the United States and your main place of business is abroad, you get an automatic two-month extension to June 15 for both filing and payment.{21Internal Revenue Service. U.S. Citizens and Resident Aliens Abroad – Automatic 2-Month Extension of Time to File A further extension to October 15 is available by filing Form 4868 before June 15. Interest accrues on any unpaid tax from April 15 regardless of extensions.
The FBAR runs on its own calendar, due April 15 with an automatic extension to October 15 that needs no form or request.{5Financial Crimes Enforcement Network. How Do I File the FBAR? It goes to FinCEN through the BSA E-Filing System, not to the IRS with your return. Save the confirmation receipt.
Catching Up If You’re Behind
If you have missed international reporting obligations and the failure was not willful, the IRS streamlined compliance procedures let you get current without the full weight of penalties. Both tracks require three years of amended or delinquent tax returns and six years of FBARs.
Terms turn on where you live. The streamlined foreign offshore procedures (for taxpayers residing outside the United States) waive all failure-to-file, accuracy, information-return, and FBAR penalties.{22Internal Revenue Service. U.S. Taxpayers Residing Outside the United States The streamlined domestic offshore procedures impose a one-time 5 percent penalty on the highest aggregate value of unreported foreign financial assets during the covered period, in place of all other penalties.{23Internal Revenue Service. U.S. Taxpayers Residing in the United States
Both programs require you to certify under penalty of perjury that the noncompliance was non-willful. That certification is the linchpin. If the IRS later finds the original noncompliance was fraudulent or an FBAR violation willful, the penalty protection disappears and full enforcement follows.
Expatriation Has Its Own Regime
Renouncing U.S. citizenship or giving up a green card held for at least eight of the prior 15 years triggers a separate set of rules, including a mark-to-market exit tax on covered expatriates. You become a covered expatriate if your net worth is $2 million or more, your average annual net income tax liability for the five prior years exceeds an inflation-adjusted threshold ($206,000 for 2025), or you fail to certify five years of tax compliance on Form 8854.{24Internal Revenue Service. Expatriation Tax The certification requirement catches people who otherwise would fall below the net worth and income thresholds: without the Form 8854 filing, you are automatically treated as a covered expatriate.{25Internal Revenue Service. Instructions for Form 8854 Anyone considering expatriation should work through the exit-tax mechanics separately before filing.