US tax obligations for American expats living in Mexico in 2026: worldwide income reporting, FBAR, FATCA, the Foreign Earned Income Exclusion, Mexican tax treaties, and how to stay compliant without overpaying.

US Taxes for Americans Living in Mexico: The Essential Guide

The US is one of only two countries in the world (the other is Eritrea) that taxes its citizens on worldwide income, regardless of where they live. Moving to Mexico doesn’t release you from IRS obligations. But it also doesn’t mean you’ll be double-taxed — the tax treaty between the US and Mexico, plus specific IRS provisions for expats, generally prevent that outcome. Understanding the rules helps you stay compliant without overpaying.

The Core Principle: Worldwide Income Reporting

As a US citizen or green card holder living in Mexico, you must file a US tax return every year your income exceeds the filing threshold — regardless of whether you also file Mexican taxes, regardless of whether your income came from US sources, and regardless of how long you’ve lived outside the US.

This doesn’t necessarily mean paying more tax. It means reporting more.

Key Provisions That Help US Expats

Foreign Earned Income Exclusion (FEIE) — Form 2555

If you’re working (earning wages or self-employment income) and living abroad, you may be able to exclude a significant portion of your earned income from US taxation:

2026 exclusion limit: Approximately $126,500 (this adjusts for inflation annually)
Who qualifies: You must pass either the Bona Fide Residence Test (you’re a legal resident of Mexico) or the Physical Presence Test (you spent at least 330 days outside the US in a 12-month period)
What it covers: Wages, salaries, self-employment income (with some modifications)
What it does NOT cover: Passive income — rental income, dividends, capital gains, pension, Social Security, investment returns

The FEIE trade-off: When you exclude income via FEIE, you also lose the ability to claim foreign tax credits on that excluded income. This matters most if you have a significant tax bill in Mexico.

Foreign Tax Credit (FTC) — Form 1116

For income that doesn’t qualify for the FEIE (or where you choose FTC instead), you can take a dollar-for-dollar credit for Mexican taxes paid on the same income:

US taxes owed minus Mexican taxes paid on the same income = actual US liability
This effectively prevents double taxation on income that’s taxed in both countries
Particularly relevant for: rental income from Mexican property, Mexican pension income, Mexican investment returns

The FTC vs FEIE choice: For many retirees and passive income earners who don’t have earned income to exclude, the FTC is the primary tool. For working expats, the choice between FEIE and FTC requires analysis — which is better depends on your specific situation.

US-Mexico Tax Treaty

The US and Mexico have a comprehensive tax treaty that:

Prevents most double taxation
Establishes which country has primary taxing rights for various income types
Provides rules for pensions, dividends, interest, and other specific income categories

Social Security: Under the treaty, US Social Security income paid to a US citizen living in Mexico is generally taxable only in the US (not also in Mexico).

FBAR: Reporting Foreign Bank Accounts (FinCEN Form 114)

If you have Mexican bank accounts and the aggregate balance across all foreign accounts exceeds $10,000 USD at any point during the calendar year, you must file an FBAR (Report of Foreign Bank and Financial Accounts):

Due date: April 15 (with an automatic extension to October 15)
Where to file: Electronically via FinCEN’s BSA E-Filing System (not with the IRS)
Penalty for non-filing: Can be severe — up to $12,921 per year for non-willful violations, much more for willful
Important: The $10,000 threshold is for aggregate all-year peak balance, not just the ending balance

Examples that trigger FBAR:

You open a Mexican bank account with $15,000 USD to pay for property; even if you spend it all, the peak balance triggered the requirement
You have $5,000 in a BBVA account and $6,000 in a Banorte account — aggregate $11,000 → FBAR required

FATCA: Foreign Account Tax Compliance Act (Form 8938)

FATCA requires disclosure of foreign financial assets above higher thresholds than FBAR:

Filing Status	In-Country Threshold	Year-End Threshold
Single / Married Filing Separately (in US)	Over $50,000 year-end or $75,000 during year	$50,000
Married Filing Jointly (in US)	Over $100,000 year-end or $150,000 during year	$100,000
Single (abroad)	Over $200,000 year-end or $300,000 during year	$200,000
Married Filing Jointly (abroad)	Over $400,000 year-end or $600,000 during year	$400,000

What counts: Foreign bank accounts, foreign investments, interests in foreign entities, foreign real estate held through a foreign entity. Note: direct ownership of foreign real estate (a house in your name) is generally NOT reportable on Form 8938 by itself (it’s reportable on FBAR only if in a foreign account/entity).

Your Mexican Property and US Taxes

Rental income from Mexican property:

Must be reported on your US return (Schedule E for most rental activity)
You can take a Foreign Tax Credit for Mexican ISR paid on that rental income
This typically prevents double taxation

Selling your Mexican property:

Capital gains on the sale are reportable to the IRS
You may take a Foreign Tax Credit for Mexican ISR (capital gains tax) paid on the sale
Long-term capital gains rates (0%, 15%, 20%) apply based on your US tax situation
Keep records of your purchase price, closing costs, and improvements (these reduce your US taxable gain)

The Mexican home sale exemption: Mexico allows a capital gains exemption for sellers who used the property as their primary residence for 5+ years. The IRS has its own exclusion ($250K for single, $500K for married) for US primary residence sales — but it applies only to homes used as the principal residence in the US, not Mexico. You cannot use both exclusions for the same sale, but the Mexican exemption (if you qualify) can significantly reduce Mexican ISR, and the FTC then reduces US liability.

US Social Security: Your Social Security benefits continue while you live in Mexico (there are very few countries from which the SSA won’t pay). Under the US-Mexico tax treaty, SS benefits are only taxed by the US (not also by Mexico).

US pensions and 401(k)/IRA distributions: Reportable to IRS. Under the treaty, these are generally taxed only by the US.

Mexican Afore (Mexico’s pension system): If you worked in Mexico and contributed to the Afore system, distributions may be taxed differently — get specific advice for this scenario.

What Most American Expats in Mérida Actually Do

For a typical American retiree in Mérida:

Income from US: Social Security, pension, IRA distributions, US investment returns
Income from Mexico: potentially rental income from Mexican property

US return: Report all of the above. Take FTC for any Mexican ISR paid on rental income. Calculate net US tax liability (often reduced to zero or near-zero by FTC if you pay meaningful Mexican taxes).

FBAR: File if Mexican bank accounts exceed $10,000 aggregate at any point.

FATCA Form 8938: File if foreign financial assets exceed the applicable threshold.

Mexican return: Working expats and rental income earners may need to file in Mexico (requires an RFC and a Mexican contador).

Getting Professional Help

Cross-border tax is a specialty. Options:

US expat tax specialists: Firms like Greenback Expat Tax Services, Taxes for Expats, and MyExpatTaxes specialize in US expat returns — they file remotely and understand the Mexico situation
Dual-credential advisors: Some CPAs and tax attorneys are licensed in both the US and Mexico — valuable for complex situations (owning a Mexican business, complex rental portfolio)
Cost: Expect $500–$2,000+ USD for a US expat return depending on complexity

Do not use a regular US tax preparer (H&R Block etc.) without expat experience. Foreign income and FBAR/FATCA are specialized areas where generalists make costly errors.

RFC and CURP for foreigners → Rental income taxes in Mexico → Capital gains tax selling in Mexico → Opening a bank account in Mexico → Talk to an advisor →

This guide is informational as of 2026 US tax year. Tax laws change, thresholds adjust annually, and individual situations vary significantly. Always work with a qualified US expat tax professional for your specific circumstances. This is not tax advice.