Taxes & Finance

U.S. citizens are taxed on worldwide income regardless of where they live, a requirement that distinguishes the United States from most other countries. According to IRS Publication 54 (Rev. December 2025), "Tax Guide for U.S. Citizens and Resident Aliens Abroad," all U.S. citizens and resident aliens must file a federal income tax return (Form 1040) if their gross income meets the standard filing thresholds—even if they reside permanently overseas. This obligation extends to reporting foreign financial accounts through FinCEN Form 114 (FBAR) and foreign financial assets through FATCA Form 8938, with significant penalties for non-compliance. The IRS provides two primary mechanisms to mitigate double taxation: the Foreign Earned Income Exclusion (FEIE), claimed via Form 2555, which allows qualifying taxpayers to exclude up to $130,000 of foreign earned income for tax year 2025 ($132,900 for 2026); and the Foreign Tax Credit (FTC), claimed via Form 1116, which offsets U.S. tax liability by the amount of taxes paid to foreign governments. Taxpayers must carefully evaluate which mechanism—or combination—best reduces their overall tax burden, as the FEIE and FTC cannot be applied to the same income. IRS Publication 514 provides detailed guidance on calculating the Foreign Tax Credit. Beyond federal obligations, Americans abroad must also consider self-employment tax on worldwide self-employment income (with limited exceptions under bilateral Totalization Agreements), quarterly estimated tax payments on the same schedule as domestic taxpayers, and potential ongoing state tax obligations depending on their last state of residence. The IRS grants an automatic 2-month filing extension (to June 15 for calendar-year filers) for citizens living abroad, but interest accrues on any unpaid tax from the original April 15 deadline. Professional tax guidance from an advisor experienced in expatriate taxation is strongly recommended.

Key Points

• 1All U.S. citizens must file Form 1040 reporting worldwide income regardless of country of residence; an automatic 2-month extension moves the filing deadline to June 15, with an additional extension available to October 15 (IRS Publication 54)
• 2The Foreign Earned Income Exclusion (Form 2555) allows exclusion of up to $130,000 for tax year 2025 and $132,900 for 2026; qualifying requires meeting either the Bona Fide Residence Test or the Physical Presence Test (330 full days in a foreign country during a 12-month period)
• 3FBAR (FinCEN Form 114) must be filed electronically by April 15 (automatic extension to October 15) if aggregate foreign financial accounts exceed $10,000 at any time during the calendar year; penalties for willful non-filing can reach $100,000 or 50% of account balance
• 4FATCA Form 8938 is required for foreign financial assets exceeding $200,000 on the last day of the tax year (or $300,000 at any time) for single filers living abroad, with higher thresholds for married filing jointly ($400,000/$600,000); failure-to-file penalty starts at $10,000
• 5The Foreign Tax Credit (Form 1116) and FEIE cannot be applied to the same income—taxpayers in high-tax countries often benefit more from the FTC, while those in low-tax countries benefit from the FEIE; excess FTC can be carried back 1 year or forward 10 years
• 6Self-employment tax (15.3% for Social Security and Medicare) applies to all worldwide self-employment income of $400 or more, even if the income is excluded under the FEIE—unless a Totalization Agreement with the foreign country provides an exemption
• 7Quarterly estimated tax payments (Form 1040-ES) follow the same schedule as domestic filers (April 15, June 15, September 15, January 15); the automatic 2-month filing extension does NOT extend estimated tax payment deadlines, and interest accrues from the original due date