Most people I talk to about their IRS problem have already built the worst-case scenario in their head. The reality is usually much more manageable. I'm Darrin Mish, and I've been representing taxpayers before the IRS for 32 years. Here's what actually tends to happen.<\/p>\n
You move abroad. You start a new life. You file taxes in your new country. Someone at a dinner party in Berlin or Buenos Aires says you do not need to bother with U.S. returns anymore because you do not live there. You want to believe them.<\/p>\n
The honest answer: the U.S. tax obligation does not end at the border. It ends at citizenship or long-term residency status, and even then with paperwork. As long as you hold a U.S. passport, you have a U.S. tax filing obligation.<\/p>\n
The United States and Eritrea are the only two countries in the world that tax based on citizenship rather than residence. Every other country taxes residents on worldwide income but lets people leave the tax system by leaving the country.<\/p>\n
The U.S. system is different. A U.S. citizen owes U.S. tax on worldwide income regardless of where they live. A U.S. green card holder is in the same position – residency for immigration purposes triggers tax residency, and the obligation continues until the green card is formally surrendered or revoked.<\/p>\n
This rule comes from IRC Section 1, which imposes tax on the “taxable income” of every individual citizen and resident, without geographic limit. The structure has been challenged on constitutional grounds and upheld – most prominently in Cook v. Tait, 265 U.S. 47 (1924), which held that the U.S. can tax its citizens on income earned abroad.<\/p>\n
The U.S. filing requirement is triggered by gross income above a threshold that varies by filing status, age, and self-employment status. For 2025, a single filer under 65 must file if gross income exceeds $14,600. Married filing jointly thresholds are higher; self-employed taxpayers must file if net self-employment income exceeds $400.<\/p>\n
For expats, “gross income” includes worldwide income before the foreign earned income exclusion. The exclusion reduces taxable income on a filed return; it does not eliminate the filing requirement. An expat earning $100,000 abroad has a filing obligation even if the entire amount is eventually excluded.<\/p>\n
The mechanisms that prevent most expats from actually owing U.S. tax are well-established but require filing to claim.<\/p>\n
The foreign earned income exclusion under IRC Section 911 lets a qualifying taxpayer exclude approximately $130,000 of foreign earned income from U.S. tax in 2025. Qualification requires meeting either the bona fide residence test or the physical presence test (330 days abroad in a 12-month period). The exclusion is claimed on Form 2555.<\/p>\n
The foreign tax credit under IRC Section 901 lets a taxpayer credit foreign income tax paid on the same income against U.S. tax liability. The credit is claimed on Form 1116. For expats in high-tax countries, the foreign tax credit alone often eliminates U.S. tax.<\/p>\n
The foreign housing exclusion or deduction adds additional protection for housing costs above a base amount. This is also claimed on Form 2555.<\/p>\n
None of these provisions self-execute. They require an actual filed U.S. return.<\/p>\n
The basic expat return is Form 1040, the same form everyone else files. Additional forms include Form 2555 (foreign earned income exclusion), Form 1116 (foreign tax credit), and any information returns triggered by foreign assets.<\/p>\n
The due date for U.S. taxpayers living abroad is automatically extended to June 15. A further extension to October 15 is available via Form 4868. A discretionary extension to December 15 is available by written request to the IRS.<\/p>\n
Filing can be done electronically from abroad in most cases. Foreign addresses are accepted. The return is filed with IRS service centers based on the taxpayer’s foreign address.<\/p>\n
The filing obligation for U.S. expats extends beyond the income tax return. The U.S. financial reporting system reaches every foreign account and asset:<\/p>\n
FBAR (FinCEN Form 114) for aggregate foreign account balances exceeding $10,000 at any point in the year.<\/p>\n
Form 8938 for specified foreign financial assets exceeding the threshold for filing status and residency. For expats, the thresholds are higher than for U.S. residents but still triggered by moderate foreign holdings.<\/p>\n
Form 5471 for ownership in foreign corporations meeting certain thresholds.<\/p>\n
Form 3520 and 3520-A for foreign trusts and large foreign gifts or inheritances.<\/p>\n
Form 8621 for passive foreign investment companies (PFICs), which include most foreign mutual funds and ETFs.<\/p>\n
These forms have their own penalty structures, and they apply even in years when no income tax is owed.<\/p>\n
Two things eventually happen if a U.S. expat does not file.<\/p>\n
First, FATCA reporting. Foreign financial institutions that hold accounts for U.S. persons report those accounts to the IRS under the Foreign Account Tax Compliance Act. The IRS matches the reported accounts against filed returns. Mismatches generate notices.<\/p>\n
Second, treaty-based information exchange. The U.S. has tax information exchange agreements with most major countries. When a foreign country shares information about a U.S. citizen’s local income, the IRS receives it.<\/p>\n
The combination means the IRS often knows about expat income and assets even when the expat has not filed. The eventual discovery may come through a FATCA letter from the foreign bank, an IRS notice referencing reported accounts, or a passport renewal issue.<\/p>\n
Under IRC Section 7345, the IRS can certify “seriously delinquent tax debt” to the State Department, which can then deny passport applications, deny renewals, or revoke existing passports. The threshold is approximately $62,000 in unpaid tax (inflation-adjusted) including interest and penalties.<\/p>\n
For an expat whose passport is the only way home, this provision can become urgent. The compliance issue does not just affect tax exposure – it affects mobility.<\/p>\n
If you stopped filing because nobody told you the obligation continued, you fit the profile for the Streamlined Foreign Offshore Procedures. The program requires three years of delinquent returns, six years of FBARs, and a non-willful certification. No penalty applies if the certification is accepted.<\/p>\n
If you stopped filing knowing the obligation existed, SFOP is not available. The Voluntary Disclosure Practice covers willful conduct with civil penalties replacing criminal exposure.<\/p>\n
The path determines the cost. Picking the wrong program can disqualify you from both.<\/p>\n
First, list every year you did not file and every country you lived in. The disclosure path depends on the gap and the facts.<\/p>\n
Second, get the foreign income data. Foreign W-2 equivalents, foreign tax records, bank statements. The return cannot be reconstructed without them.<\/p>\n
Third, talk to a U.S. tax attorney before filing anything. The first return triggers IRS engagement; the right program closes it cleanly.<\/p>\n