Expat Taxes in 2026: What Americans Living Abroad Need to Know

The United States is one of only two countries in the world that taxes its citizens on worldwide income, regardless of where they live. That means if you are an American living in Lisbon, Bangkok, or Mexico City, the IRS still expects to hear from you every April — and potentially collect.

Understanding expat taxes USobligations is not optional. Failing to file can result in penalties starting at $10,000 per form, loss of your passport, and years of compounding headaches. The good news: the tax code also contains powerful exclusions, credits, and treaty provisions that can reduce — and in many cases eliminate — your US tax bill entirely.

This guide covers everything Americans abroad need to know: FBAR, FEIE, the Foreign Tax Credit, FATCA, tax treaties, state taxes, Social Security obligations, estimated payments, investment income, common mistakes, and when it makes sense to hire a specialist. Whether you are a remote worker, retiree, or digital nomad, this is the foundation you need before your first overseas tax season.

Your tax burden depends heavily on where you settle. Compare destinations holistically with our retirement or digital nomad rankings, or browse affordable countries under $2,000/mo to maximize your after-tax purchasing power.

Citizenship-Based Taxation: Why the US Is Different

Most countries use residence-based taxation— you pay taxes where you live. The US uses citizenship-based taxation. If you hold a US passport or green card, you owe federal income tax on your worldwide income no matter where you earn it or where you sleep at night. The only other country with this system is Eritrea.

This creates a unique problem for American expats: potential double taxation. You might owe taxes both to your country of residence and to the United States on the same income. The FEIE and Foreign Tax Credit exist specifically to address this, but you have to actively claim them. Nothing is automatic.

Green card holders face the same obligations as citizens. Even if you leave the US and never plan to return, as long as you hold a green card you are subject to US worldwide taxation. Surrendering a green card or renouncing citizenship triggers its own set of tax rules, including a potential exit tax for individuals who meet certain net worth or tax liability thresholds. The expatriation process requires filing Form 8854 and potentially paying tax on the unrealized gains of all your assets as if they were sold at fair market value on the day before expatriation.

FEIE: The Foreign Earned Income Exclusion in Detail

The Foreign Earned Income Exclusion (Form 2555) is the most widely used tool for Americans abroad. It lets you exclude up to $132,900 (2024 tax year, adjusted annually for inflation) of foreign-earned income from your US return. This exclusion applies only to earned income— wages, salaries, professional fees, and self-employment income. It does not cover investment income, pensions, Social Security benefits, or rental income. Use our free FEIE calculator to estimate how much you could save based on your income and destination.

Qualification Tests: Physical Presence vs Bona Fide Residence

To claim the FEIE, you must satisfy one of two tests. Choosing the right one depends on your travel patterns and long-term plans.

The Physical Presence Test is the simpler and more mechanical of the two. You must be physically present in a foreign country (or countries) for at least 330 full days during any consecutive 12-month period. A “full day” means the entire 24-hour period from midnight to midnight. Days spent in transit over international waters do not count toward either the US or a foreign country. Days when you are physically present in the US — even for a few hours — count as US days and break your streak.

The 12-month qualifying period does not have to align with the calendar year. You can choose any consecutive 12-month period that includes part of the tax year in question. This is particularly useful for people who move mid-year: if you left the US on July 1 and remained abroad for the rest of the year, your qualifying period might run from July 1 of that year to June 30 of the following year, and you would prorate the exclusion for the eligible portion of each tax year.

The Bona Fide Residence Test is more subjective but more flexible once established. You must be a bona fide resident of a foreign country for an uninterrupted period that includes an entire calendar year (January 1 through December 31). The IRS looks at factors such as your intention to remain abroad, the length and nature of your stay, whether you have a permanent home in the foreign country, your ties to the local community, and the type of visa you hold. A tourist visa generally does not support bona fide residence status.

The key advantage of the Bona Fide Residence Test is that you can make trips back to the US without jeopardizing your status, as long as those trips are temporary and you maintain your foreign residence. There is no strict day count. However, you cannot claim bona fide residence for your first year abroad unless you also remain a resident through at least January 1 of the following year.

Partial Year Exclusion

If your qualifying period does not cover the full tax year, you receive a prorated exclusion. The formula is straightforward: divide the maximum exclusion by the number of days in the year, then multiply by the number of qualifying days in that year. For example, if you qualified for 200 days out of 365, your exclusion would be approximately $69,315 (200/365 times $132,900). This commonly applies to people who move abroad mid-year or return to the US before year-end.

The Foreign Housing Exclusion and Deduction

On top of the earned income exclusion, the FEIE offers a housing exclusion (for employees) or housing deduction (for the self-employed) that can shelter additional income used for qualifying housing expenses. Qualifying expenses include rent, utilities (not including telephone), personal property insurance, nonrefundable deposits, and parking rental fees. Mortgage payments, purchased furniture, domestic labor, and television subscriptions do not qualify.

The housing amount is calculated as your actual housing expenses minus a base amount (16% of the FEIE maximum, or about $20,240 for 2024). The maximum housing exclusion is generally capped at 30% of the FEIE maximum (roughly $37,950), but the IRS publishes higher limits for designated high-cost cities. Locations like London,Hong Kong, Tokyo, Singapore, and Zurich have significantly higher caps, reflecting their actual cost of living. The IRS updates this list annually in the instructions for Form 2555.

The housing exclusion is especially valuable in expensive cities where rent alone can consume a large portion of your income. Combined with the main income exclusion, a single filer in a high-cost location could potentially exclude over $160,000 of foreign earned income from US taxation.

Important FEIE Caveats

Once you elect the FEIE, revoking it has consequences. If you revoke the FEIE election, you cannot re-elect it for five years without IRS approval. This makes switching between the FEIE and the Foreign Tax Credit a decision worth modeling carefully before you commit.

The FEIE also raises your effective tax rate on income above the exclusion. Because the excluded income is still used to determine your tax bracket (under the “stacking rule”), any income above the exclusion amount is taxed at the rate that would apply if you had not excluded anything. For high earners, this can push remaining income into higher brackets than expected.

Foreign Tax Credit: Dollar-for-Dollar Relief

The Foreign Tax Credit (Form 1116) works differently from the FEIE: instead of excluding income, it gives you a dollar-for-dollar credit against your US tax liability for income taxes you have already paid to a foreign government. If you live in a country with a tax rate equal to or higher than the US (Germany, France, Japan, Scandinavian countries), the FTC often eliminates your entire US bill and may generate carryover credits for future years.

Direct vs Indirect Foreign Tax Credits

Individual taxpayers primarily use the direct credit, which applies to foreign income taxes you personally paid or that were withheld from your income. This is what most expats deal with: income tax withheld by a foreign employer, or taxes you paid on your self-employment income to a foreign government.

The indirect credit (also called the deemed-paid credit) historically applied to US shareholders of foreign corporations who received dividends. The Tax Cuts and Jobs Act of 2017 largely replaced this with a new regime for controlled foreign corporations, but it remains relevant for certain corporate structures. If you own or control a foreign corporation, this is an area where specialized expat tax advice is essential.

Per-Country vs Overall Limitation

The FTC is subject to a limitation: you cannot claim a credit greater than the US tax you would owe on that same foreign-source income. The IRS calculates this using a fraction: your foreign-source taxable income divided by your total worldwide taxable income, multiplied by your total US tax liability.

You must calculate this limitation separately for different “baskets” or categories of income. The two main baskets are general category income (most earned income, business income, and certain other income) and passive category income (dividends, interest, rents, royalties, and capital gains from passive investments). Excess credits in one basket cannot offset taxes in the other. This basket system prevents you from using credits generated by high-tax active income to offset tax on lightly taxed passive income.

Carryback and Carryforward

If your foreign tax credits exceed the limitation in a given year, the excess is not lost. You can carry back unused credits one year and carry forward unused credits for up to ten years. This is particularly useful when your income or tax rates fluctuate between years. For instance, if you move from a high-tax country to a low-tax country, you can carry forward excess credits from the high-tax years to offset any remaining US liability in the low-tax years.

The carryforward provision makes the FTC more flexible than the FEIE over a multi-year planning horizon. Expats who live in high-tax countries for several years often accumulate significant credit carryforwards that continue to reduce their US liability even after they move to a different country or return to the US.

Using Both FEIE and FTC Together

You can use both the FEIE and the FTC in the same tax year, but you cannot claim the FTC on income that was already excluded by the FEIE. The typical strategy is to exclude your earned income up to the FEIE limit, then apply the FTC to any remaining earned income above the exclusion and to all investment or passive income. Planning these together is where an expat CPA earns their fee — the interaction between the two provisions and the FTC limitation formula can produce unexpected results if not modeled carefully.

Tax Treaty Benefits: Country-Specific Relief

The US has income tax treaties with over 60 countries. These treaties serve as bilateral agreements that override certain provisions of domestic tax law, generally in favor of the taxpayer. Treaty benefits go beyond what the FEIE and FTC provide, including reduced withholding rates on investment income, tie-breaker rules for determining tax residency, and special provisions for specific income types.

How Treaty Benefits Work

To claim treaty benefits, you generally report the treaty position on your US tax return using Form 8833 (Treaty-Based Return Position Disclosure). This form identifies which treaty article you are relying on and how it affects your tax liability. Failure to disclose a treaty position can result in a $1,000 penalty per failure (or $10,000 for C corporations), even if the position itself is correct. Simply taking the benefit without disclosing the treaty basis is a common and avoidable mistake.

Treaty benefits are not automatic. You must actively claim them, and you must understand which specific articles apply to your situation. Many treaties include a Limitation on Benefits (LOB) article that restricts who can claim treaty benefits to prevent treaty shopping.

Most Beneficial US Tax Treaties for Expats

Not all treaties are created equal. Some key examples:

• United Kingdom: Comprehensive treaty that coordinates pension taxation and provides reduced withholding on investment income. The US-UK treaty includes specific provisions for retirement plan distributions that can prevent double taxation on 401(k) and IRA withdrawals. Dividend withholding is reduced to 15% (or 0% for certain pension funds).
• Germany: Treaty includes provisions for self-employment income and works closely with the Social Security totalization agreement. The Germany treaty is particularly useful for its treatment of teaching and research income, which may be exempt for up to two years.
• Canada:One of the most extensive US treaties, with detailed provisions for cross-border workers, retirement income, and Social Security benefits. The treaty includes a unique provision allowing Canadians and Americans to contribute to the other country’s retirement plans and defer taxation.
• Japan: Reduced withholding on dividends (10% instead of 30%) and clear rules for employment income earned in Japan. Interest income is generally exempt from withholding under the treaty.
• Netherlands: Strong provisions for pension income and favorable treatment of certain types of business income. The treaty also includes a comprehensive mutual agreement procedure for resolving double taxation disputes.
• Portugal:Treaty covers pension income and prevents double taxation on Social Security benefits. This has been particularly important for US retirees taking advantage of Portugal’s favorable residency programs.
• France: Detailed provisions for real estate income, capital gains, and retirement distributions. The treaty includes specific rules for stock options and similar employee compensation.

Countries without a US tax treaty include many popular expat destinations: Brazil, Vietnam, most of Central America (except Honduras and a limited treaty with Barbados in the Caribbean), Colombia, Peru, and much of Southeast Asia. In these countries, you rely entirely on the FEIE and FTC for relief. This does not necessarily mean higher taxes — many of these countries have low local tax rates or territorial systems — but it does mean fewer tools for resolving edge cases.

State Tax Obligations After Moving Abroad

Federal taxes get most of the attention, but state taxes can blindside expats who assume leaving the country means leaving their state behind. Unlike federal law, which has well-defined provisions for Americans abroad, state tax rules vary enormously and some states are far more aggressive than others about maintaining their claim on your income.

The Most Problematic States

Californiais notoriously aggressive. The Franchise Tax Board may claim you are still a resident if you maintain ties such as property, bank accounts, voter registration, a California driver’s license, or even membership at a California gym. The state applies a “closer connection” test and safe harbor rules that effectively require you to be gone for 18 or more months with minimal connections. California also has specific rules about “sourced income” — if you earned income from California clients or California-based companies, the state may tax that income even after you have established domicile elsewhere. At a top marginal rate that exceeds 13%, the stakes are high.

New Yorkoperates similarly. Maintaining a “permanent place of abode” in New York while abroad can trigger continued tax liability, even if you are physically present in the state for fewer than 183 days. The definition of “permanent place of abode” is broad: an apartment you maintain, a room in a family member’s house where you have a key, or even a storage unit with personal effects can count. New York City residents face an additional city income tax, compounding the issue.

Virginiaconsiders you a domiciliary resident until you demonstrate that you have established legal domicile elsewhere. Simply moving abroad is not sufficient — you must affirmatively establish domicile in another jurisdiction. New Mexico is similar, applying domicile-based taxation that follows you overseas. South Carolina has residency rules that can trap expats who have not formally severed ties, and the state has been known to pursue former residents for back taxes.

The Clean Break Strategy

The most effective strategy is to establish domicile in a no-income-tax statebefore moving abroad. The nine states with no income tax on earned income are Texas, Florida, Nevada, Wyoming, Washington, South Dakota, Tennessee, Alaska, and New Hampshire (New Hampshire taxes only interest and dividends). To establish domicile, you should obtain a driver’s license in the new state, register to vote there, update your address with banks and financial institutions, and maintain a mailing address (a family member or commercial mail-forwarding service works). Some expats rent a small apartment or use a UPS Store address to create a stronger paper trail.

If you are currently a resident of a problematic state, do this before you leave the country. Trying to change your domicile from abroad is significantly harder. Some states accept it; others will argue you never truly left. The small logistical effort of spending a few weeks in a no-tax state before departure can save thousands of dollars per year.

Keep in mind that the FEIE does not apply to state taxes — it is a federal provision only. If your former state claims you as a resident, you owe state income tax on your worldwide income with no FEIE offset. Some states allow a credit for foreign taxes paid, but the rules vary and the relief is often incomplete. See our Sticky States guide for state-by-state exit strategies.

FBAR and FATCA: Foreign Account Reporting

FBAR (FinCEN Form 114)

The Report of Foreign Bank and Financial Accounts (FBAR, officially FinCEN Form 114) is one of the most overlooked and most punitive requirements for Americans abroad. If the aggregate value of all your foreign financial accounts exceeds $10,000 at any point during the year, you must file an FBAR electronically through the BSA E-Filing System. The filing deadline is April 15, with an automatic extension to October 15 — no request required.

The $10,000 threshold applies to the combined total of all your foreign accounts, not each individual account. If you have three accounts with $4,000 each, you exceed the threshold. The IRS uses the highest balance during the year, not the year-end balance, so even a brief spike above the threshold triggers the requirement.

“Financial accounts” includes checking, savings, investment accounts, mutual funds, and any account where you have signature authority — even if you do not own it. This catches more people than you might expect. A joint account with a non-US spouse, a business account you are authorized to sign on, a foreign brokerage account, a foreign pension plan, or even certain foreign life insurance policies with cash value all count.

The penalties for non-compliance are severe: up to $10,000 per account per year for non-willful violations, and up to $100,000 or 50% of the account balance (whichever is greater) for willful violations. Criminal penalties including imprisonment are possible in extreme cases. The IRS has been aggressive about enforcing FBAR compliance since 2010, and ignorance is not a reliable defense.

FATCA (Form 8938)

The Foreign Account Tax Compliance Act(FATCA) was signed into law in 2010 and has fundamentally changed what it means to be an American abroad. On the institutional side, FATCA requires foreign financial institutions to report accounts held by US citizens to the IRS. Banks that refuse face a 30% withholding penalty on their US-source income. This means your foreign bank is almost certainly reporting your account information to the IRS already — filing your own disclosures is not optional.

On the individual side, FATCA requires you to file Form 8938 (Statement of Specified Foreign Financial Assets) if your foreign assets exceed specific thresholds. For Americans living abroad, these thresholds are higher than for domestic filers:

• Single filers abroad: $200,000 at the end of the year, or $300,000 at any point during the year.
• Married filing jointly abroad: $400,000 at the end of the year, or $600,000 at any point during the year.
• Domestic filers (for comparison): $50,000 at year-end or $75,000 at any point (single), $100,000/$150,000 (married filing jointly).

Form 8938 covers a broader range of assets than the FBAR, including foreign stock, securities, financial instruments, contracts with non-US persons, and interests in foreign entities. The FBAR and Form 8938 have overlapping but not identical requirements — many expats need to file both. The penalty for failing to file Form 8938 is $10,000, with additional penalties up to $50,000 for continued non-filing after IRS notification.

Coming Into Compliance

If you have been abroad and have not filed FBARs or Form 8938, the Streamlined Filing Compliance Procedures offer a way to come into compliance without facing the full penalty structure. Under this program, you file the last three years of tax returns and six years of FBARs, certify that your non-compliance was non-willful, and generally face zero penalties (for those living abroad) or a reduced 5% penalty (for those in the US). This is significantly better than the alternative of the IRS discovering your non-compliance independently. However, the Streamlined Procedures are only available if you come forward before the IRS contacts you.

Social Security and Medicare Taxes Abroad

This catches many expats off guard: the FEIE does not exempt you from self-employment tax(Social Security and Medicare, currently 15.3% combined — 12.4% for Social Security on income up to the wage base, and 2.9% for Medicare with no cap). If you are self-employed, freelancing, or running your own business abroad, you owe SE tax on your worldwide net self-employment income even if the FEIE reduces your federal income tax to zero. This 15.3% can be the single largest US tax obligation for an expat freelancer earning below the FEIE threshold.

Totalization Agreements

The US has Social Security totalization agreements with about 30 countries, including most of Western Europe, Canada, Australia, Japan, and South Korea. These bilateral agreements serve two purposes: they eliminate dual Social Security taxation, and they allow you to combine work credits from both countries to qualify for benefits.

Under a totalization agreement, you generally pay into the social security system of the country where you work. If your foreign employer sends you abroad temporarily (five years or less in most agreements), you may continue paying into the US system under a “Certificate of Coverage” (Form SSA-1116). For permanent moves, you pay into the foreign system exclusively.

The critical implication: years spent paying into a foreign system under a totalization agreement do not count toward US Social Security credits. You need 40 credits (roughly 10 years of work) to qualify for US Social Security retirement benefits. If you move abroad at age 35 and pay into a foreign system for 25 years, you may not qualify for US Social Security unless you had enough credits before you left. The totalization agreement allows you to combine credits from both countries to meet the minimum threshold, but your benefit amount is prorated based on the actual time in each system.

When You Still Owe SE Tax

If you live in a country withouta totalization agreement (most of Latin America, Southeast Asia, and Africa), you owe US self-employment tax regardless of whether you also pay into the local social security system. This can result in double social security taxation with no relief. Countries in this category include Mexico, Colombia, Thailand, Vietnam, Indonesia, and Costa Rica — many of the most popular expat destinations.

For employees of foreign companies in non-totalization countries, the situation is better. If you are employed by a foreign company (not a US company and not self-employed), you generally do not owe US Social Security or Medicare tax. The employer pays into the local country’s system instead. However, if you work for a US employer or a foreign subsidiary of a US company, you may still owe FICA taxes depending on the arrangement.

Investment Income and Capital Gains Abroad

The FEIE only covers earned income. If you have investment income— dividends, interest, capital gains, rental income, or royalties — that income is fully subject to US taxation regardless of where you live. This is where many expats discover that moving abroad does not eliminate their US tax bill.

Foreign Mutual Funds and PFICs

One of the most important tax traps for American expats involves Passive Foreign Investment Companies (PFICs). If you invest in a mutual fund, ETF, or investment fund domiciled outside the US, the IRS classifies it as a PFIC and applies punitive tax treatment. Under the default PFIC rules, you are taxed at the highest marginal rate on any gains, plus an interest charge for the deferral period. There is no preferential long-term capital gains rate for PFIC gains.

This means that the local index fund your foreign financial advisor recommends could result in a significantly worse tax outcome than holding US-domiciled funds. The practical advice for most expats is to keep your investments in US-based brokerage accounts (Charles Schwab International, Interactive Brokers, and Fidelity are popular options for expats) and invest in US-domiciled funds. Avoid opening investment accounts at your local foreign bank unless you understand the PFIC implications.

Rental Income from US or Foreign Properties

If you own rental property — whether in the US or abroad — that income is reportable on your US return. For US rental properties, the tax treatment is the same as if you were living domestically. For foreign rental properties, you report the income in US dollars (using the average exchange rate for the year), claim allowable deductions, and can use the Foreign Tax Credit for any foreign taxes paid on the rental income. Depreciation rules follow US tax law regardless of where the property is located.

Capital Gains and Currency Considerations

Capital gains on the sale of assets are reported in US dollars, which means exchange rate fluctuations can create taxable gains even when the investment lost value in local currency terms. Conversely, a falling dollar can amplify gains. For real estate abroad, the sale price and cost basis must both be converted to US dollars at the exchange rates applicable on the respective dates. Foreign currency gains and losses from personal transactions (converting dollars to local currency for living expenses) are generally not taxable unless they exceed $200 per transaction.

Filing Deadlines and Extensions for Americans Abroad

The standard US tax filing deadline is April 15. However, Americans living abroad receive several accommodations:

Automatic Two-Month Extension

If your tax home is in a foreign country and you are physically present outside the US on April 15, you receive an automatic two-month extension to file your return, pushing the deadline to June 15. No form is required to claim this extension — you simply attach a statement to your return indicating that you qualify. However, this is an extension to file, not an extension to pay. Interest accrues on any unpaid tax from April 15, regardless of the filing extension.

Further Extensions

Beyond the automatic two-month extension, you can file Form 4868 to request an additional extension to October 15. If you need even more time (for example, to satisfy the Physical Presence Test or Bona Fide Residence Test), you can request a discretionary extension to December 15 by filing a letter with the IRS before the October deadline explaining why you need the additional time. This special extension is specifically available for expats who have not yet met the qualifying tests but expect to by year-end.

Key Dates at a Glance

• April 15: Standard filing deadline. Tax payments due. First estimated payment. FBAR initial deadline (auto-extended to October 15).
• June 15: Automatic extension for qualifying expats. Second estimated payment due. Interest accrues from April 15 on any unpaid balance.
• September 15: Third estimated payment due.
• October 15: Extended filing deadline (via Form 4868). FBAR final deadline.
• December 15: Special discretionary extension for expats who need time to meet qualifying tests.
• January 15: Fourth estimated payment for the prior year.

Estimated Tax Payments

Living abroad does not change the IRS requirement to make estimated quarterly paymentsif you expect to owe $1,000 or more in taxes for the year. The due dates are the same as domestic filers. Underpayment penalties apply if you do not pay at least 90% of the current year’s tax or 100% of the prior year’s tax (110% if your AGI exceeded $150,000) through withholding or estimated payments.

Set up IRS Direct Pay or EFTPS (Electronic Federal Tax Payment System) before you leave the US to make quarterly payments from abroad without complications. Both systems accept payments from foreign bank accounts, but EFTPS requires initial enrollment while you still have a US address and phone number. Doing this before departure saves considerable hassle.

Common Mistakes and Penalties

Even well-intentioned expats make costly errors. Here are the most common mistakes and their consequences:

1. Not Filing at All

The most expensive mistake is also the most common: assuming that living abroad means you do not need to file a US tax return. Even if you owe zero tax after applying the FEIE and FTC, you must still file to claim those benefits. The failure-to-file penalty is 5% of the unpaid tax for each month the return is late, up to 25%. The failure-to-pay penalty is 0.5% per month, also up to 25%. Combined with interest, a few years of non-filing can turn a $0 tax bill into thousands in penalties.

2. Forgetting the FBAR

The FBAR is filed separately from your tax return (through the BSA E-Filing System, not with the IRS), and many expats either do not know about it or forget. At $10,000 per violation per year for non-willful failures, this can quickly become the most expensive oversight in an expat’s financial life. If you have foreign accounts, set a calendar reminder.

3. Misunderstanding the Physical Presence Test

The Physical Presence Test requires 330 full days outside the US, not 330 days abroad total. A full day means the entire 24-hour period from midnight to midnight in a foreign country. The day you leave the US and the day you arrive back do not count. Brief trips home for holidays, family emergencies, or business meetings eat into your qualifying days faster than expected. Keep a detailed travel log with dates, countries, and purpose of travel.

4. Investing in Foreign Mutual Funds (PFICs)

As discussed in the investment section, purchasing mutual funds domiciled outside the US subjects you to the PFIC regime, which applies punitive tax rates and complex reporting requirements (Form 8621 for each PFIC holding). Many expats make this mistake by following the advice of a local financial advisor who does not understand US tax law. The filing requirement for Form 8621 alone can add hundreds of dollars in tax preparation costs per fund.

5. Revoking the FEIE Without Planning

If you elect the FEIE one year and then decide the Foreign Tax Credit is better the next year, you can switch. But if you revoke the FEIE, you are locked out of re-electing it for five tax years without IRS approval. Expats who bounce between strategies without understanding this rule can find themselves stuck with a suboptimal approach for half a decade.

6. Ignoring State Tax Obligations

Filing your federal return from abroad while ignoring your former state is a common and potentially expensive oversight. States like California and New York have long statutes of limitation and dedicated enforcement units. The penalties mirror federal penalties, and states can garnish federal refunds to collect unpaid state taxes.

7. Not Reporting Foreign Financial Accounts on Form 8938

Many expats file the FBAR but overlook Form 8938, or vice versa. These are separate requirements with different thresholds and different filing methods. Both must be filed when applicable, and the penalties for each are assessed independently.

When to Hire an Expat CPA

Some expat tax situations are straightforward enough to handle with tax software. Others are not. Here is a practical decision framework:

You can probably DIY if:

• You have W-2 income from a US employer and no foreign accounts over $10,000
• Your only foreign income is below the FEIE limit and you have no investment income
• You live in a country with a clear US tax treaty
• Your financial situation has not changed significantly from year to year

Hire an expat CPA if:

• You are self-employed or own a business abroad
• You have both earned and investment income in multiple currencies
• You own foreign rental properties or hold foreign partnerships
• You are behind on filing and need to use the Streamlined Procedures
• You are making the FEIE vs FTC election for the first time and want to optimize
• You have a foreign spouse and need to navigate filing status rules
• Your total foreign accounts exceed $200,000 (FATCA threshold)
• You own shares in a foreign corporation or have PFIC holdings
• You receive income from multiple countries in a single year
• You are considering renouncing citizenship or surrendering a green card

Expect to pay $500–$2,500for an expat tax return depending on complexity. Firms like Greenback Expat Tax Services, Bright!Tax, and MyExpatTaxes specialize in this space. The cost is real, but the penalty for getting it wrong is far higher. A single missed FBAR can cost you $10,000 — the CPA pays for itself the first year.

The Bottom Line

American expat taxes are more complex than domestic filing, but they are not unmanageable. The core framework is straightforward: file your return, report your foreign accounts (FBAR and Form 8938 when applicable), and use the FEIE or FTC (or both) to minimize double taxation. Layer on treaty benefits and smart state-tax planning, and most expats end up owing little or nothing to the IRS.

The biggest mistake is not the taxes themselves — it is ignoring the filing requirements entirely. The IRS has more visibility into foreign accounts than ever before thanks to FATCA, and the penalties for non-compliance are steep. Start clean, file on time, and get professional help when the situation warrants it. If you are already behind, the Streamlined Filing Compliance Procedures offer a reasonable path to get current without catastrophic penalties — but only if you act before the IRS comes to you.

Your choice of destination also matters for your tax picture. Countries with territorial tax systems, low income tax rates, totalization agreements, or strong US treaties can dramatically simplify your situation. If taxes are a major factor in your relocation decision, use our country comparison tool to evaluate destinations side-by-side, or see how cost of living compares to understand the full financial picture.

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