Do Mexican Citizens Pay Taxes in Mexico and the US?

Mexican citizens can owe taxes in both Mexico and the United States, and whether you pay one government, the other, or both depends on where you live, where your income is earned, and how long you spend in each country. The good news: the US-Mexico income tax treaty and a foreign tax credit system keep the same dollar from being fully taxed twice, so in practice you generally end up paying whichever country’s rate is higher on any given piece of income rather than paying full freight to both.¹

Article 31 of the Mexican Constitution requires every citizen to contribute to public spending in a proportional and equitable manner, and that obligation does not disappear when you cross the border.² The US side of the ledger works independently, so the practical question is which of two overlapping tax systems has a claim on each part of your income.

When Mexico Taxes You

Mexico’s Federal Tax Code uses two tests for tax residency. The first is whether you have a home in Mexico. If you keep homes in both Mexico and another country, Mexico still treats you as a resident when your “center of vital interests” sits there, meaning either more than 50 percent of your annual income comes from Mexican sources or Mexico is the primary location of your professional activities.

Citizenship matters here in a way that catches many people off guard. Mexican citizens who move abroad and fail to formally notify the Servicio de Administración Tributaria (SAT) of their change in tax residency can continue to be treated as Mexican residents. The notice is filed on Form RX, and the burden is on you to prove you have established tax residency elsewhere. Mexico does not automatically release you from its tax system just because you left.

Residents Owe Tax on Worldwide Income

If you qualify as a Mexican tax resident, you owe Impuesto sobre la Renta (ISR) on everything you earn, everywhere.³ Wages earned in the United States, rent from property abroad, and interest from any foreign bank account all count.

Mexico uses a progressive rate structure with 11 brackets for 2026. The lowest marginal rate is 1.92 percent on the first roughly 10,135 MXN of taxable income. Rates climb through intermediate brackets of 6.40, 10.88, 16.00, 17.92, 21.36, 23.52, 30.00, 32.00, and 34.00 percent, and income above approximately 5,107,704 MXN is taxed at the top rate of 35 percent. The annual return is due April 30 of the year following the tax year.

Non-Residents Owe Tax Only on Mexican-Source Income

Mexican citizens who live permanently abroad and can prove foreign tax residency owe Mexican tax only on income generated inside Mexico. Rent from Mexican property, interest from a Mexican bank account, and profits from selling Mexican real estate all qualify, and the SAT usually collects through withholding at the source.

Non-residents receiving rental income from Mexican property generally face a flat 25 percent withholding on the gross amount, with none of the itemized deductions available to residents. Interest from Mexican financial institutions is withheld at rates ranging from 0 to 35 percent depending on the instrument. When a non-resident sells Mexican real property, the buyer withholds 25 percent of the total sale price. As an alternative, if the seller has a legal representative in Mexico and closes before a notary public, the seller can elect to pay 35 percent on the net profit, calculated by subtracting the original purchase cost and certain closing expenses from the sale price.⁴ The net-profit method often produces a lower bill when the property has appreciated only modestly.

When the United States Taxes You

The IRS sorts non-citizens into two categories, and the label controls what income gets taxed and which form you file.

Resident Aliens

You are treated as a US resident alien if you meet the substantial presence test: at least 31 days in the United States during the current year, and a total of at least 183 days over a three-year window. The three-year calculation counts all days in the current year, one-third of the days in the prior year, and one-sixth of the days two years back.⁵ Meeting that test, or holding a green card, means the IRS taxes your worldwide income the same as it taxes a US citizen.⁶ Resident aliens file Form 1040 and need either a Social Security Number or an Individual Taxpayer Identification Number (ITIN).

Non-Resident Aliens

Mexican citizens who fail the substantial presence test and do not hold a green card are non-resident aliens. They file Form 1040-NR and report only US-source income: wages for work performed in the United States, rent from US property, and US-source investment income.⁶ One important limitation applies to Mexican filers specifically: non-resident aliens generally cannot claim the standard deduction. On Form 1040-NR the standard deduction is available only to students and business apprentices qualifying under the US-India treaty, so Mexican non-resident aliens must itemize.⁷

How the Treaty Prevents Double Taxation

When both Mexico and the United States have a claim on the same income, the US-Mexico Income Tax Convention is what keeps the total bill reasonable.¹ The main mechanism is a foreign tax credit: tax you pay to one country on a piece of income reduces the tax the other country charges on that same income, dollar for dollar up to the second country’s rate. You end up effectively paying whichever rate is higher, but the same dollar is not taxed at full rates in both places.

Tiebreaker Rules for Dual Residents

If both countries claim you as a tax resident, the treaty uses a sequence of tiebreakers to decide which one has the primary right to tax you. It looks first at where you have a permanent home, then at your center of vital interests if you have homes in both, then at your habitual place of residence, and finally at your citizenship. If none of those settles the question, the two tax authorities can work it out through a Mutual Agreement Procedure.¹

One boundary to be aware of: the treaty covers income taxes only. The United States and Mexico do not have a separate estate or gift tax treaty, so cross-border estates involving property in both countries can face obligations to both governments without treaty relief.⁸

Reporting Mexican Accounts to the US

If you are a US person, meaning a US resident, citizen, or green card holder, holding accounts in Mexico brings extra reporting obligations that sit on top of your regular tax return.

FBAR

If the combined value of your foreign financial accounts exceeds $10,000 at any point in the year, you must file a Report of Foreign Bank and Financial Accounts (FBAR) with FinCEN.⁹ Checking, savings, brokerage, and certain other accounts held outside the United States all count. The FBAR is due April 15 with an automatic extension to October 15, no request required.¹⁰

Form 8938

The Foreign Account Tax Compliance Act (FATCA) adds a separate Form 8938 requirement at higher thresholds. Unmarried filers living in the United States must file if their specified foreign financial assets exceed $50,000 on the last day of the tax year or $75,000 at any point during it. For married couples filing jointly and living in the United States, the thresholds are $100,000 and $150,000. Filers living abroad get higher thresholds: $200,000 and $300,000 for single filers, and double those figures for joint filers.¹¹

Missing Form 8938 costs $10,000, plus up to $50,000 more if you keep ignoring the requirement after the IRS notifies you. A 40 percent penalty applies to any tax understatement tied to undisclosed foreign assets.¹¹

Pensions and Social Security

Retirement income has its own set of treaty rules that can substantially shift where you pay. Private pensions and similar payments for past employment, including distributions from accounts like a 401(k), are taxable only in the country where the recipient lives. Retire to Mexico with a US private pension, and Mexico has the sole right to tax it under Article 19.¹

US Social Security benefits work the other way. They are taxable only in the country that pays them, meaning the United States, regardless of where you live when you collect. Annuities, defined as regular payments made under a contract in return for consideration, follow the pension rule and are taxable only in the recipient’s country of residence.

One important gap: the United States and Mexico signed a Social Security Totalization Agreement in 2004 that would let workers combine credits earned in both countries and eliminate dual Social Security taxation. The agreement still requires approval from the US Congress and the Mexican Senate, and that process remains incomplete as of 2026. For now, workers splitting a career across the border cannot combine credits and may pay into both Social Security systems at once.

Filing Deadlines in Both Countries

Mexican and US filing dates fall within about two weeks of each other, so gathering records once for both returns tends to work better than treating them as separate projects.

Mexico annual ISR return: April 30 of the year following the tax year.
US Form 1040 or 1040-NR: April 15, with an automatic two-month extension to June 15 for US citizens and resident aliens living abroad, and a further extension to October 15 by filing Form 4868.
FBAR (FinCEN Report 114): April 15, with an automatic extension to October 15.¹⁰
Form 8938: filed with your US income tax return, so the same deadlines and extensions apply.

Penalties for Getting It Wrong

Both governments treat willful tax evasion as a crime. In the United States, willfully attempting to evade federal tax is a felony carrying a fine of up to $100,000 and up to five years in prison, and filing a fraudulent return or making false statements to the IRS can bring up to three years.¹² For non-citizens there is a further consequence: tax evasion is generally treated as a crime of moral turpitude under US immigration law, which can trigger removal proceedings.

Mexico similarly imposes criminal penalties for tax fraud, including potential imprisonment. Beyond the criminal exposure, failing to file or underreporting income in either country brings civil fines, interest, and loss of access to some government benefits. Given the complexity of a dual-country return, many cross-border filers use professional preparation, which typically runs between $600 and $3,000 or more.

1
Internal Revenue Service. United States – Mexico Income Tax Convention
2
SCJN. Political Constitution of the United Mexican States (English Translation)
3
DOF – Diario Oficial de la Federación. DECRETO por el que se reforman, adicionan y derogan diversas disposiciones de la Ley del Impuesto sobre la Renta
4
SAT. Sale of Real Estate Income
5
Internal Revenue Service. Substantial Presence Test
6
Internal Revenue Service. Publication 519 (2025), U.S. Tax Guide for Aliens
7
Internal Revenue Service. 2025 Instructions for Form 1040-NR
8
Internal Revenue Service. Estate and Gift Tax Treaties (International)
9
Financial Crimes Enforcement Network. Report Foreign Bank and Financial Accounts
10
Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR)
11
Internal Revenue Service. Summary of FATCA Reporting for U.S. Taxpayers
12
Internal Revenue Service. The Truth About Frivolous Tax Arguments – Section III