For US citizens in Mexico, tax compliance involves navigating a US income tax treaty, complex reporting for local retirement accounts (AFOREs), and crucially, the lack of a social security totalization agreement. This means self-employed Americans often face paying social security taxes to both countries. While the Foreign Tax Credit can eliminate US income tax on Mexican earnings, reporting obligations for accounts and investments remain extensive.
US filing basics every American abroad must know
US citizens and green-card holders are taxed on worldwide income wherever they live, and usually must file Form 1040 once gross income exceeds the IRS threshold ($15,750 for single filers, $31,500 for married filing jointly, and $23,625 for head of household for 2025), even when no tax is ultimately due. The tools that reduce double taxation are the Foreign Earned Income Exclusion (FEIE, up to $130,000 for 2025 under IRC §911) and the Foreign Tax Credit. Neither is automatic. The FEIE requires a tax home in a foreign country plus either the bona fide residence test or 330 full days abroad in a 12-month period, and it reaches earned income only. The Foreign Tax Credit is figured separately for each income category under IRC §904 and is capped at the US tax on the foreign income in that category, so it reduces double taxation without guaranteeing that none remains.
Two reporting rules catch most filers in Mexico: the FBAR (FinCEN Form 114), required when foreign financial accounts exceed $10,000 in aggregate at any point in the year, and Form 8938 (FATCA) for specified foreign assets above the applicable threshold. Both can carry penalties even when no tax is owed. If you are behind, the Streamlined Filing Compliance Procedures are the usual path back for non-willful taxpayers. They run on two tracks: the foreign track carries no offshore penalty but requires meeting the program's non-residency test, and the domestic track carries a 5% offshore penalty but works through amended returns, so it does not fit someone who never filed at all. Tax and interest on the catch-up years are owed whichever route applies.
US tax treaty with Mexico
The US-Mexico income tax treaty aims to prevent double taxation, but its benefits for US citizens are limited by the 'saving clause'. This clause allows the US to tax its citizens as if the treaty didn't exist. In practice, the treaty's main functions for individuals are to reduce withholding tax rates on income flowing between the countries and to provide rules for claiming foreign tax credits, which is the primary mechanism for avoiding double taxation on income.
Article 1(4) (Saving Clause).
The United States reserves the right to tax its citizens and residents on their worldwide income as if the treaty had not come into effect. Article 1 was replaced in full by the 2002 protocol, which moved the saving clause from paragraph 3 to paragraph 4. This is the most critical article for US citizens, as it overrides most treaty provisions that might otherwise exempt them from US tax, subject to the exceptions listed in paragraph 5.
Article 10 (Dividends).
This article limits the tax that Mexico can withhold on dividends paid to a US resident. The rate is capped at 10% in general, drops to 5% where the beneficial owner is a company owning directly at least 10% of the voting stock, and drops to 0% under paragraph 3 for a company that has owned 80% or more of the voting stock for the 12 months ending on the declaration date and meets the Article 17 limitation-on-benefits conditions, and for a qualifying pension fund.
Article 11 (Interest).
Reduces the withholding tax on interest payments across three tiers: 4.9% where the beneficial owner is a bank or insurance company that granted the loan, or the interest comes from bonds or securities regularly and substantially traded on a recognized market; 10% where the interest is paid by a bank or by the purchaser of machinery and equipment to the seller on a sale on credit; and 15% in all other cases.
| Income type | Treaty rate | Statutory rate | Notes |
|---|---|---|---|
| Dividends | 10% | 10% | 5% if the beneficial owner is a company that owns directly at least 10% of the voting stock of the paying company. Article 10(3), as replaced by the 2002 protocol, sets 0% for a company that has owned 80% or more of the voting stock for the 12 months ending on the declaration date and meets the limitation-on-benefits conditions, and for a qualifying pension fund. |
| Interest | 4.9%, 10% or 15% | 4.9%-35% | 4.9% where the beneficial owner is a bank or insurance company that granted the loan, or the interest is from bonds or securities regularly and substantially traded on a recognized market; 10% where the interest is paid by a bank or by the purchaser of machinery and equipment to the seller on a sale on credit; 15% in all other cases. |
| Royalties | 10% | 25%-35% |
Because of the saving clause, a US citizen living in Mexico cannot use the treaty to exempt their Mexican-source income from US tax. The main benefit comes from using the Foreign Tax Credit (under the rules of Article 24, Relief from Double Taxation) to offset US tax liability with taxes paid to Mexico.
AFOREs and US Tax
Mexico's primary retirement vehicles, Administradoras de Fondos para el Retiro (AFOREs), are not considered qualified retirement plans by the IRS. This has significant US tax implications:
- Annual Taxation: The internal earnings and growth within an AFORE are often subject to US tax annually, even if no money is withdrawn. The specific treatment can be complex, potentially viewing the AFORE as a foreign grantor trust or its underlying funds as Passive Foreign Investment Companies (PFICs).
- Extensive Reporting: An AFORE is a foreign financial account. It must be reported on FinCEN Form 114 (FBAR) and likely IRS Form 8938 (FATCA) if asset thresholds are met. Depending on the legal structure and investments, you may also need to file Form 3520/3520-A for foreign trusts or Form 8621 for PFICs.
Investments, property, and capital gains in Mexico
Most Mexican-domiciled mutual funds and ETFs are considered Passive Foreign Investment Companies (PFICs) by the IRS. This triggers burdensome reporting on Form 8621 for each fund and can lead to punitive tax rates unless specific, timely elections are made. When selling Mexican real estate, Mexico may impose a tax of 25% on the gross price or 35% on the net gain. This Mexican tax can generally be claimed as a foreign tax credit on US Form 1116 to offset US tax on the same capital gain. While the US doesn't use Mexico's specific exemption, US expats can apply the US Section 121 exclusion of up to $250,000 ($500,000 MFJ) of gain to the sale of their Mexican primary residence.
Self-employment and companies in Mexico
A Mexican company like a Sociedad Anónima (S.A.) or Sociedad de Responsabilidad Limitada (S. de R.L.) is a Controlled Foreign Corporation (CFC) when US shareholders, counting only those who each own 10% or more, together own more than 50% of its vote or value. Your own stake alone does not settle it. Where that test is met, a US shareholder owning 10% or more files Form 5471 annually and may face current US taxation on the company's profits under the GILTI or Subpart F regimes. For self-employed individuals, there is no US-Mexico totalization agreement in force. One was signed in 2004 but has never entered into force, so no Certificate of Coverage is available to avoid US social security taxes. You are liable for US self-employment tax of 15.3% on 92.35% of your net earnings, with the 12.4% Social Security portion stopping at the annual wage base ($176,100 for 2025) and the 2.9% Medicare portion uncapped, plus a further 0.9% Additional Medicare Tax on combined Medicare-taxed wages and self-employment income above $200,000 for a single, head-of-household or qualifying-surviving-spouse filer, $250,000 for a joint return, and $125,000 for married filing separately, in addition to any social security contributions required by Mexico.
Worked examples
Self-employed consultant in Mexico City (2025)
Maria is a US citizen and marketing consultant living in Mexico City. She earns $80,000 in net self-employment income. Because there is no totalization agreement, she has two separate US tax obligations. First, she owes US self-employment tax of 15.3% on 92.35% of her net earnings, which is $80,000 * 0.9235 * 0.153 = $11,304. This tax is due to the US regardless of any taxes she pays in Mexico. Second, she reports the $80,000 as income on her US income tax return. She can use the foreign taxes she paid to Mexico's SAT to claim a Foreign Tax Credit on Form 1116, which will likely offset any US income tax, but it does not affect the separate self-employment tax liability.
Salaried employee at a Mexican company (2025)
John works for a Mexican manufacturing company and earns a salary of MXN 1,500,000 (roughly USD 85,000). His employer withholds Mexican income tax and contributes to his AFORE. On his US return, John will report the USD 85,000 salary. He will then calculate his Mexican tax paid in US dollars and claim it as a Foreign Tax Credit on Form 1116. Since Mexican income tax rates are comparable to or higher than US rates, this credit typically eliminates his US income tax on the salary. He must also report his bank accounts and his AFORE on an FBAR, as the total value exceeds $10,000. He may also need to file Form 8938 and potentially Form 8621 or 3520-A for the AFORE's earnings.
Retiree with investments (2025)
Susan, a retiree in San Miguel de Allende, receives $40,000 in US Social Security and $20,000 from a US-based IRA. Both are taxable in the US as normal. She also invested in a Mexican stock market mutual fund, which generated $5,000 in gains. This fund is a PFIC. She must file Form 8621 for the fund. If she did not make a timely election, the $5,000 gain is taxed at the highest marginal US tax rates, plus an interest charge, resulting in a much higher tax bill than a similar US mutual fund would. She must also report all her foreign accounts, including the account holding the PFIC, on her FBAR.
Common mistakes for Americans in Mexico
- Assuming a US-Mexico totalization agreement exists and failing to pay US self-employment tax.
- Forgetting to report an AFORE account on the FBAR (Form 114) and Form 8938.
- Treating Mexican mutual funds (or funds inside an AFORE) like US funds and failing to file Form 8621 for PFICs.
- Believing the US-Mexico tax treaty allows them to exclude Mexican income from their US tax return.
- Not realizing that earnings inside an AFORE can be taxable in the US on a current-year basis.
- Failing to report the sale of a primary residence in Mexico on a US tax return.
- Neglecting to file Form 5471 for a controlled Mexican business entity like an S.A. or S. de R.L.
- Using the Foreign Earned Income Exclusion (FEIE) when the Foreign Tax Credit (FTC) would be more beneficial due to Mexico's relatively high tax rates.
Mexico tax FAQ
Do I have to pay US Social Security tax if I'm self-employed in Mexico?
Yes. There is no social security agreement (totalization agreement) in force between the US and Mexico: one was signed in 2004 and has never entered into force. A self-employed US citizen in Mexico owes US self-employment tax of 15.3% on 92.35% of their net earnings, with the 12.4% Social Security portion stopping at the annual wage base ($176,100 for 2025) and the 2.9% Medicare portion uncapped, once net earnings are $400 or more. This applies even if they also pay into the Mexican social security system, and no Certificate of Coverage is available to avoid it.
Is my Mexican AFORE retirement account taxable in the US?
Yes, typically. AFOREs are not 'qualified' plans under US law. This means the internal earnings and growth are often subject to US tax each year, even if you don't take a distribution. The specific tax treatment is complex and may require filing Forms 3520/3520-A or 8621.
Do I need to report my AFORE on an FBAR?
Yes. An AFORE is a foreign financial account. Its value counts toward the aggregate threshold for filing the Report of Foreign Bank and Financial Accounts (FBAR). If the total of all your foreign accounts exceeds $10,000 at any point during the year, you must file an FBAR.
Does the US-Mexico tax treaty eliminate my US filing obligation?
No. Due to the 'saving clause' in the treaty, the US retains the right to tax its citizens on their worldwide income. You must still file a US tax return and report all your income. The treaty's main benefit is preventing double taxation, primarily through the Foreign Tax Credit.
What happens if I own a Mexican mutual fund?
It is almost certainly a Passive Foreign Investment Company (PFIC). Owning a PFIC requires you to file Form 8621 for each fund, every year. The default tax rules for PFICs are extremely punitive, so it is critical to get professional advice on making a timely election (like a QEF or Mark-to-Market election) to mitigate the tax cost.
I sold my home in Mexico. Do I report it to the IRS?
Yes. The US taxes its citizens on worldwide capital gains. However, the US allows an exclusion of up to $250,000 ($500,000 MFJ) of gain on a primary residence under Section 121, which applies to homes in Mexico. You must report the sale on your US tax return. You can, however, claim a foreign tax credit for any capital gains tax you paid to Mexico on the sale.
I started a small business in Mexico as an S. de R.L. What do I need to do?
The company is a Controlled Foreign Corporation (CFC) if US shareholders who each own 10% or more together own more than 50% of its vote or value, so your own stake alone does not settle it. Where that test is met and you own 10% or more, you must file Form 5471, which is a detailed informational return about the foreign corporation. Depending on the company's income, you may also have a current US tax liability on its profits under the GILTI rules.
Should I use the Foreign Tax Credit or the Foreign Earned Income Exclusion in Mexico?
For most people earning income in Mexico, the Foreign Tax Credit (FTC) is more advantageous. Mexico's income tax rates are relatively high, so the amount of tax paid to Mexico is often enough to offset the US income tax on the same earnings, subject to the Form 1116 limitation for each income category. The FTC also preserves the refundable Additional Child Tax Credit; electing the FEIE bars it for the whole year under IRC §24(d)(3), whatever the income figures. The FEIE has its own conditions in any case: a tax home in Mexico plus either the 330-day physical presence test or the bona fide residence test.
Sources and last reviewed
- IRS - U.S. Income Tax Treaties A to Z (verified 2026-06-07)
- IRS - Tax Treaty Tables (verified 2026-06-07)
- U.S. Treasury - Mexico Tax Convention Technical Explanation (via IRS) (verified 2026-06-07)
- SSA - List of Countries with Totalization Agreements (verified 2026-06-07)
- Mexico - Servicio de Administración Tributaria (SAT) (verified 2026-06-07)
Reviewed by Ilya Fayerman, Esq. (NY Bar) on
Common services needed by expats in Mexico
Most Americans abroad in Mexico need help with at least one of the following core compliance areas, which frequently interact:
- US expat tax returns, Form 1040 with FEIE, FTC, treaty positions, and any required state returns.
- FBAR reporting, FinCEN Form 114 for foreign financial accounts exceeding $10,000 aggregate at any time during the year.
- Form 8938 (FATCA), IRS disclosure of specified foreign financial assets when thresholds are met.
- Streamlined catch-up filing, For eligible non-willful taxpayers with prior unfiled years.
Related country guides
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- US expat tax in Brazil
- US expat tax in Costa Rica
- US expat tax in Turks and Caicos
- US expat tax in Panama
- US expat tax in Colombia