Common US Expat Tax Issues & Questions—Advice & Answers Provided

The United States is one of the few countries that taxes based on citizenship rather than residence, which means you must report and potentially pay tax on your worldwide income, no matter where you live.

Failure to understand and fulfil your filing requirements can result in penalties, interest charges, and increased audit risk.

This guide explains the most common expat tax issues faced by Americans living abroad, including worldwide income reporting, foreign asset disclosures, tax credits, exclusions and common filing mistakes. It also answers frequently asked questions to help you remain compliant while managing your cross-border tax affairs.

Why Does the US Tax Expats?

One of the main expat tax issues for many US citizens is confusion regarding the payment of US taxes on worldwide income while living in another country. The main reason for this law is that US tax obligations depend on citizenship rather than residence.

Renouncing US citizenship generally ends future US income tax obligations, although significant tax and legal consequences may arise, including possible exit tax rules for covered expatriates.

Taxes US Expats May Need to Consider

As a US citizen living outside of America, you must file a federal tax return. Generally, you must pay worldwide:

Depending on the state you lived in before moving abroad, you may still be considered a tax resident and required to file a state tax return.

Certain states apply domicile-based rules that can continue to treat former residents as state taxpayers even after they move abroad. States such as California, New York, and Virginia may continue to regard you as a resident for state tax purposes if you maintain sufficient ties, such as property ownership, voter registration, or a driver’s licence.

While many states may consider you a non-resident if you are physically absent for more than half the year, the rules vary significantly.

Given the complexity of state tax residency, it is highly recommended to seek advice from a tax professional familiar with multi-state and international residency issues.

Like all US citizens, you must file the 1040 form to report your income to the IRS.

To simplify tax filing and planning while living abroad, you can utilise tax planning services at Titan Wealth International. Our tax experts will ensure you’re fulfilling all your tax obligations on time.

What Expat Tax Issues Do Americans Face When Filing Taxes From Abroad?

While US expats still have to pay US taxes, you may be able to eliminate or reduce tax liability in certain scenarios. To do so, you must file your taxes properly, which many Americans struggle with due to complex tax laws in the US. Here are the main errors US expats make when filing taxes from abroad:

1. Reporting gross foreign income correctly
2. Foreign rental property reporting
3. Foreign financial account reporting
4. Understanding the exit tax
5. Continuing state tax residency

Reporting Gross Foreign Income Correctly

If you are eligible to claim the Foreign Tax Credit (FTC), you must still report the full amount of your foreign income on your US tax return. The Foreign Tax Credit does not reduce your taxable income. Instead, it is claimed separately to reduce your US tax liability on qualifying foreign-source income.

A common mistake is assuming that foreign tax paid can simply be deducted from income before reporting it to the IRS. For example, if you earned $3,000 of foreign employment income and paid $600 in qualifying foreign income tax, you should report the full $3,000 of income on your tax return and claim the $600 Foreign Tax Credit, if eligible. Reporting only $2,400 of income would be incorrect.

Foreign Rental Property Reporting

US citizens must generally report foreign rental income and expenses on their US tax return, regardless of whether the income is taxable or reportable in the country where the property is located.

Common mistakes include:

1. Assuming rental income does not need to be reported to the IRS because it falls below the local country’s reporting or tax threshold.
2. Failing to report a foreign rental property because it generated a loss.

Under US tax rules, foreign rental properties are generally reported using the same principles that apply to US rental properties, although differences in depreciation methods, exchange rate conversions, and other tax rules may apply.

Even if the property generates a loss, it should generally still be reported on your US tax return. Depending on your circumstances, the use of rental losses may be limited under the passive activity loss rules.

Foreign Financial Account Reporting

As a US expat, you are required to report foreign financial accounts and assets to the US government.

You must file an FBAR (Foreign Bank Account Report) if the aggregate value of all foreign financial accounts exceeds $10,000 USD at any point during the calendar year. This applies even if each account is below the threshold individually.

You must also file Form 8938 (Statement of Specified Foreign Financial Assets) under the Foreign Account Tax Compliance Act (FATCA) if your total foreign financial assets exceed:

1. $200,000 at year-end (single filer abroad), or
2. $400,000 at year-end (married filing jointly abroad).

Penalties for non-compliance can be severe:

• FBAR: Up to $16,536 per non-willful violation; the greater of $165,353 or 50% of the account balance per willful violation
• Form 8938: A $10,000 minimum fine, increasing if the failure continues after IRS notification.

Given the complexity of international reporting requirements, it is highly recommended to consult an expat tax specialist to ensure compliance and avoid penalties.

Understanding the Exit Tax

As per IRC §877A, individuals who satisfy the criteria for “covered expatriates” when renouncing US citizenship or terminating long-term green-card status may be subject to a mark-to-market exit tax. The tax treats worldwide assets as if they had been sold at fair market value on the day before expatriation.

To assess eligibility, the IRS utilises three tests:

If you are considered a covered expatriate, your exit tax liability will depend on the type of asset and the rules that apply to it under IRC §877A:

• Capital and investment assets: Generally treated as if they were sold for their fair market value on the day before expatriation. Any deemed gain is taxed under the normal tax rules applicable to that asset (for example, eligible long-term capital gains generally retain capital gains treatment).
• Net deemed gains: The first $910,000 of net deemed gain (for the 2026 tax year) is excluded. Any remaining gain is taxed under the normal rules applicable to the asset.
• Tax-deferred accounts (e.g., traditional IRAs): Certain tax-deferred accounts are generally treated as if they were fully distributed immediately before expatriation, subject to the specific rules that apply to each type of account.

After the tax is calculated, you will utilise Form 8854 to fulfil the related obligations. Failure to do this in a timely manner may trigger a penalty of up to $10,000.

Continuing State Tax Residency

While physical relocation may end federal residency concerns, certain states may continue to treat you as a resident for tax purposes if you have not sufficiently severed your ties and abandoned your domicile. These states include:

• California
• New York
• Virginia
• New Mexico

It is also worth noting, most states do not recognise the federal Foreign Earned Income Exclusion (FEIE). As a result, income that is fully excluded from federal taxation may remain fully taxable at the state level.

To minimise the risk of ongoing state tax liability, you should take steps to establish that you have permanently abandoned your former state domicile and do not intend to return. Depending on your circumstances, these steps may include:

• Surrendering your state driver’s license
• Cancelling voter registration
• Updating your address
• Cancelling all local memberships and accounts

The specific steps for abandoning your domicile can vary significantly depending on your existing ties to your state. It is therefore prudent to consult a tax professional who will understand your specific circumstances and provide personalised advice for ceasing state residency.

Common Questions About Expat Tax—Answered

US expats often face issues regarding specific questions related to their tax-paying obligations. The most frequent expat tax questions are related to:

• Percentage of tax for expats
• Late tax returns
• Tax exemptions
• Filing inbound tax returns

What Is the Percent of Tax an Expat Must Pay as a US Citizen?

As a US citizen, you are taxed on your worldwide income, regardless of where you live. This means you are subject to the same federal income tax brackets as residents of the United States.

For the 2026 tax year (returns to be filed in 2027), marginal tax rates range from 10% to 37% across seven brackets, a structure made permanent by the One Big Beautiful Bill Act. The tax rates depend on your filing status and taxable income as follows:

*These brackets are indexed annually for inflation.

What Happens if You File a Late Tax Return?

If you don’t file a US tax return as an expat or are late with filing your taxes, you may incur penalties, passport denial, and even criminal charges. If you knowingly avoided your US tax obligations while living abroad, there may be even more serious legal consequences.

The penalty for failing to file taxes is 5% of the unpaid taxes for each month you were late with your tax return, and this amount is capped at 25% of your unpaid taxes. If you are over 60 days late, the minimum Failure to File penalty for the 2025 tax year is the lesser of $525 or 100% of the underpayment (the IRS adjusts this minimum for inflation each year).

The Failure to Pay penalty is 0.5% of the taxes you haven’t paid each month, up to 25%.

If both Failure to File and Failure to Pay are applicable in the same month, the former is redacted by the amount of the latter. The combined penalty becomes 5% for each month (or part of the month) you were late.

Is There a Tax Exemption for US Expats Living Abroad?

Yes, the IRS provides several tax benefits to help you reduce tax liability while living abroad. Some of the tax exemptions you may be liable for include:

Do I Have To File an Inbound Expatriate Tax Return as a US Expat?

Some countries, such as Spain and Italy, offer favourable tax regimes for inbound expatriates. These programmes allow qualifying expats to be treated as non-residents for local tax purposes, often for up to six years, even after establishing legal residency.

For example, under Spain’s inbound expatriate regime, qualifying individuals who move to Spain may be taxed only on Spanish-source income at a flat rate, rather than on their worldwide income, for the year of arrival and the following five tax years.

These are local country tax incentives, not US tax exemptions.

As a US citizen, you are still required to file US tax returns and report your worldwide income under US tax law, regardless of local tax benefits abroad.

These foreign regimes can reduce your local tax burden, which may in turn lower your total global tax liability – especially when used in conjunction with US provisions like the Foreign Tax Credit or FEIE.