US-Mexico tax treaty: rules, rates, and key traps for US expats
The US-Mexico Income Tax Convention, signed September 18, 1992, and in force since January 1, 1994, reduces double taxation on cross-border income – but does not eliminate US tax obligations for US citizens under Article 1(3), the saving clause.
This article covers the treaty's practical impact on US expats: residency rules and tiebreaker tests under Article 4, saving clause mechanics, withholding rates on dividends, interest, and royalties under Articles 10–12, pension and Social Security treatment under Article 19, capital gains under Article 13, and required forms including Form 8833 and Form 1116.
The US-Mexico tax treaty does not replace the general US expat filing obligation. US citizens in Mexico who meet the applicable income threshold must file Form 1040 and meet all standard IRS reporting requirements.
The 5 most-searched questions about the US-Mexico income tax treaty answered at a glance.
| Question | Answer |
|---|---|
| Does Mexico have a tax treaty with the US? | Yes – in force since January 1, 1994 |
| Does the treaty eliminate US tax for US citizens in Mexico? | No – Article 1(3) (saving clause) preserves the US taxing rights over its citizens |
| What does the treaty mainly reduce? | Withholding on dividends (5–10% under Art. 10), interest (4.9–15% under Art. 11), royalties (10% under Art. 12) |
| Does Mexico have a Totalization Agreement with the US? | No – Mexico has no US Social Security Totalization Agreement in force as of March 2026. |
| Where is the official treaty text? | IRS Mexico tax treaty documents page and IRS treaty PDF |
What is the US-Mexico income tax treaty?
The US-Mexico Income Tax Convention is a bilateral agreement signed on September 18, 1992, in force on January 1, 1994, that allocates taxing rights between the United States and Mexico and sets maximum withholding rates on dividends, interest, and royalties paid between the two countries.
The treaty covers US federal income taxes and Mexico's Impuesto Sobre la Renta under Article 2. The treaty applies to residents of one or both contracting states – a taxpayer need not be a citizen of either country to qualify as a resident for treaty purposes.
Social Security taxes are explicitly excluded from the treaty's coverage under Article 2(3)(a).
The US-Mexico tax treaty explained below covers the original 1992 convention and the protocols listed on the IRS Mexico treaty documents page, including a 2003 protocol and accompanying technical explanations.
Who can use the treaty – and why the saving clause matters most
Any resident of the US or Mexico can potentially use the tax treaty between the US and Mexico, but US citizens face a critical limitation: Article 1(3) – the saving clause – allows the United States to tax its citizens as if the treaty had never been signed, which overrides most treaty benefits for Americans living in Mexico.
The saving clause: Article 1(3)
Article 1(3) of the US-Mexico treaty preserves the right of the United States to tax its own citizens on worldwide income regardless of where they live, including Mexico.
A US citizen living full-time in Mexico still must file a US return and report Mexican-source income. The treaty does not create an exemption from US tax solely because the person resides in Mexico.
Based on TFX client experience: a US citizen residing in Mexico City full-time in 2025 with Mexican salary income filed a US return and reported 100% of that income, using the Foreign Tax Credit on Form 1116 to reduce double taxation rather than a treaty exemption.
When the treaty still provides real benefits
Despite the saving clause, the US-Mexico treaty provides 5 categories of benefits usable by US citizens: reduced withholding on dividends, interest, and royalties under Articles 10–12; tiebreaker rules for dual-resident situations under Article 4; relief from double taxation under Article 24; limited pension protections under Article 19(1)(b); and government service rules under Article 20.
Article 24 is itself a required exception to the saving clause under Article 1(4), meaning the Foreign Tax Credit mechanism operates alongside the treaty, not instead of it.
US citizens in Mexico may reduce double taxation through the Foreign Tax Credit or the Foreign Earned Income Exclusion – the treaty does not determine which applies.
Also read. When to choose FTC over FEIE in 2026
Tax residency and tiebreaker rules (Article 4)
Article 4 of the US-Mexico treaty defines residency for treaty purposes and provides 4 sequential tiebreaker rules to resolve situations where a taxpayer qualifies as a tax resident in both the US and Mexico simultaneously.
Dual residency becomes relevant when a US citizen establishes a home in Mexico and Mexican domestic law also treats that person as a tax resident – Mexico determines residency based on where a person establishes their home, or, if they have homes in both countries, where their center of vital interests is located.
When dual-residency issues arise
Dual-residency analysis becomes necessary when a US citizen has established a permanent home in Mexico and Mexican domestic law also treats that person as a tax resident, based on where the person establishes their home or, if homes exist in both countries, where their center of vital interests is located.
The following 3 situations most frequently trigger a dual-residency analysis for US expats:
- US citizen living full-time in Mexico with a local address, Mexican bank accounts, and a Mexican employer
- US citizen splitting time between both countries with a permanent home in each
- US citizen on a Mexican permanent residency visa receiving Mexican-source employment or self-employment income
The 4 tiebreaker tests in sequence (Article 4(2))
Article 4(2) resolves dual residency through 4 sequential tests applied in the order listed – the first test that produces a definitive answer governs.
- Permanent home – resident of the state where a permanent home is available; if homes in both states, move to test 2
- Center of vital interests – resident of the state with closer personal and economic relations; if indeterminate, move to test 3
- Habitual abode – resident of the state where the person habitually spends more time; if habitual abode in both or neither, move to test 4
- Nationality – resident of the state of which the person is a national; if dual national or national of neither, competent authorities settle by mutual agreement
How the treaty reduces double taxation (Article 24)
Article 24 of the US-Mexico treaty requires both countries to provide relief from double taxation by allowing a tax credit for taxes paid in the other country. Article 24 is explicitly excepted from the saving clause under Article 1(4), meaning US citizens in Mexico can use this relief even though the saving clause overrides most other treaty benefits.
The Foreign Tax Credit in practice
The most common way a US citizen in Mexico uses Article 24 is by claiming the Foreign Tax Credit on Form 1116, which can reduce US tax on foreign-source income up to the FTC limit. If Mexican taxes paid exceed the limit, the excess can generally be carried back one year and forward ten years.
Based on TFX client experience: a US citizen in Guadalajara earned $90,000 in Mexican salary in 2025, paid approximately $18,000 in Mexican income tax, and applied the Foreign Tax Credit on their US return – reducing their US liability on that income to near zero.
The Foreign Tax Credit is claimed on Form 1116, filed with Form 1040. For 2025, Form 1116 includes separate categories: section 951A income, foreign branch income, passive income, general income, section 901(j) income, income re-sourced by treaty, and lump-sum distributions – a separate Form 1116 is required for each applicable category.
Treaty withholding rates by income type (Articles 10, 11, 12)
Articles 10, 11, and 12 of the US-Mexico tax treaty cap the withholding tax that Mexico (or the US) may apply when paying dividends, interest, and royalties to a resident of the other country. These caps are lower than Mexico's domestic withholding rates and represent one of the treaty's most practical benefits for cross-border investors.
Withholding rates under the US-Mexico tax treaty – verified against the IRS treaty PDF (1992 convention with protocols).
| Income type | Article | Qualifying condition | Max WHT rate |
|---|---|---|---|
| Dividends | Art. 10 | Beneficial owner holds ≥10% of paying company's voting stock | 5% |
| Dividends | Art. 10 | All other cases | 10% |
| Interest | Art. 11 | Bank loans, institutional lenders, publicly traded bonds | 4.9% |
| Interest | Art. 11 | Other bank-paid interest and seller financing | 10% |
| Interest | Art. 11 | All other cases | 15% |
| Royalties | Art. 12 | All cases | 10% |
These rates apply to the gross amount of each payment. The beneficial owner must satisfy Article 17 (Limitation on Benefits) to claim reduced treaty rates.
US-Mexico tax treaty withholding rates under Articles 10–12 apply only to residents who satisfy the Limitation on Benefits conditions under Article 17. For most individual US citizens and Mexican nationals receiving passive income, these conditions are met automatically – but complex ownership structures or conduit arrangements require additional analysis.
How US expats use treaty withholding rates
A US citizen living in Mexico who receives dividends from a Mexican company can use Article 10 to limit Mexico-side withholding to 10% – or 5% if holding ≥10% of voting stock – rather than a higher domestic rate.
The tax withheld in Mexico is creditable against US tax liability via Form 1116. A US citizen reports the gross dividend on Form 1040 and claims the Mexican withholding tax as a foreign tax credit, reducing the US liability on that same income.
Employment income and independent services (Articles 14–15)
Articles 14 and 15 of the US-Mexico income tax treaty cover how employment income and independent contractor income are taxed across borders. For US citizens working in Mexico, Article 15 generally assigns primary taxing rights to Mexico when employment is exercised there – but the saving clause keeps US filing obligations in place regardless.
Employees working in Mexico for a local employer
A US citizen employed by a Mexican company and working in Mexico is subject to Mexican income tax under domestic Mexican law, and Article 15 of the treaty confirms Mexico as the source country with primary taxing rights over that employment income.
Under Article 15, an employee is exempt from source-country tax only if all 3 conditions are met simultaneously:
- Present fewer than 183 days in a 12-month period
- The employer is a resident of the other state
- The remuneration is not borne by a permanent establishment in the source state
For US citizens living full-time in Mexico, all three conditions usually fail – Mexico taxes the income in full.
Independent contractors and short-term assignments
Article 14 covers independent personal services and applies a fixed-base rule: Mexico may tax a US contractor's income if the contractor maintains a fixed base in Mexico, or is present in Mexico for more than 183 days in any 12-month period.
Based on TFX client experience: a US freelance consultant spending 200+ days per year in Mexico City in 2025 was subject to Mexican income tax on services income under Article 14, while still required to file a full US return under IRC obligations.
Self-employed US citizens in Mexico should review FEIE eligibility for self-employed expats before choosing between the Foreign Tax Credit and the Foreign Earned Income Exclusion.
Pensions, annuities, and Social Security (Article 19)
Article 19 of the US-Mexico treaty covers pensions, annuities, alimony, and child support. Paragraph 1(b) of Article 19 is explicitly excepted from the saving clause under Article 1(4), which means certain pension and annuity provisions can modify how the saving clause otherwise applies – though the exceptions are narrow.
Private pensions and retirement accounts
Retirement income from US private pensions and retirement accounts (IRA, 401(k)) received by a US citizen living in Mexico is taxable under US domestic rules, with the Article 19 saving clause exception applying only to specific government and cross-border pension structures – not to standard US domestic retirement account distributions.
Based on TFX client experience: a US retiree in the Yucatan receiving $48,000 in annual IRA distributions in 2025 reported that income in full on their US return, as the Article 19(1)(b) exception did not modify the treatment of domestic IRA distributions.
Social Security and the Totalization Agreement distinction
US Social Security benefits received by a US citizen in Mexico are covered by Article 19(1)(b) of the treaty – benefits paid by one country to a resident of the other, or to a US citizen, are taxable only in the paying country.
Social Security payroll taxes are excluded from the treaty under Article 2(3)(a), but the treaty still governs the tax treatment of the benefits themselves.
Mexico has no Totalization Agreement in force with the United States as of March 2026 – a 2004 agreement was signed, but has not entered into force. The SSA list of countries with active US Totalization Agreements confirms Mexico is not among them.
Self-employed US citizens in Mexico may owe both US self-employment tax and Mexican IMSS contributions simultaneously – without the dual-coverage relief a Totalization Agreement would provide. The US self-employment tax is generally 12.4% Social Security tax up to the annual wage base, plus 2.9% Medicare tax on all net earnings, with an additional 0.9% Medicare tax above the applicable threshold.
Real property income and capital gains (Articles 6 and 13)
Article 6 of the treaty covers rental and real property income, and Article 13 covers US-Mexico tax treaty capital gains. Both articles allow the country where the property is located to tax the income, meaning a US citizen renting or selling Mexican property faces Mexican tax on that income, while the saving clause keeps the US return obligation in place.
Rental income from Mexican property (Article 6)
Under Article 6, Mexico may tax rental income derived from immovable property situated in Mexico, regardless of whether the beneficial owner is a US citizen residing in the US or in Mexico.
Article 6(5) gives the taxpayer an election to compute Mexican tax on rental income on a net basis, deducting expenses as if the income were attributable to a Mexican permanent establishment. For US citizens, the same rental income is reportable on the US return, and Mexican taxes paid are creditable via Form 1116.
Capital gains on Mexican real estate and other assets (Article 13)
Article 13 allocates capital gains taxing rights: gains from immovable property situated in Mexico may be taxed by Mexico; gains from shares in a company whose assets consist principally of real property situated in Mexico may also be taxed in Mexico.
Mexican capital gains tax on real estate sales may be calculated as 25% of the gross sales price or 35% of the net gain – both amounts are creditable against US capital gains tax liability via Form 1116. US citizens must still report the gain on Schedule D and Form 8949 of their US return.
How to take a treaty position and what to document
A US taxpayer who relies on a treaty provision to reduce or modify US tax liability must disclose that position by attaching Form 8833 (Treaty-Based Return Position Disclosure) to their US return. Failing to file Form 8833 when required can result in a $1,000 penalty per occurrence under IRC § 6712.
When Form 8833 is required
Form 8833 is required for any tax year a US taxpayer claims a treaty benefit that overrides or modifies how a provision of the IRC otherwise applies – such as claiming a treaty-based residency position or modifying the tax treatment of income. Reduced withholding rates on dividends, interest, rent, and royalties are specifically excepted from the Form 8833 requirement.
The following 3 situations most commonly require a US expat in Mexico to file Form 8833:
- Claiming a tiebreaker residency position under Article 4 to establish Mexico as the primary treaty residence country
- Relying on Article 19(1)(b) pension exceptions to modify pension tax treatment
- Claiming a treaty-based position that re-sources income under Article 24 or another provision that modifies how US domestic tax law otherwise applies to that income
Documentation checklist
Retain the following 6 categories of records for at least 6 years after the return is filed, or longer if a treaty position is under examination:
- Copies of all Mexican tax returns and payment receipts showing taxes paid in Mexico
- Form 8833 filed with each US return where a treaty position was taken
- Residency documentation used in any tiebreaker analysis: lease agreements, utility bills, employer letters, family ties evidence
- Proof of beneficial ownership percentage for reduced withholding claims under Articles 10–12
- All Form 1116 filings with supporting worksheets for each income category
- Mexican withholding statements showing taxes withheld at source
US expats in Mexico with foreign accounts must also meet separate FBAR and FATCA reporting requirements – these obligations run independently of any treaty position taken on Form 8833.
Conclusion
The following 5 points summarize the practical impact of the US-Mexico tax treaty for US citizens:
- The treaty has been in force since January 1, 1994, and covers US federal income taxes and Mexico's Impuesto Sobre la Renta
- The saving clause under Article 1(3) keeps most US tax obligations in place for US citizens, regardless of Mexican residence
- The treaty caps withholding on dividends at 5–10% (Art. 10), interest at 4.9–15% (Art. 11), and royalties at 10% (Art. 12)
- Tiebreaker rules under Article 4 help resolve dual residency, but rarely eliminate the US return obligation
- Mexico has no Totalization Agreement with the US as of March 2026 – self-employed US citizens face potential dual Social Security obligations
The tax treaty between the US and Mexico provides real benefits for expats who understand how to use it – and real traps for those who assume it eliminates US tax. TFX CPAs prepare returns for US citizens in Mexico across all income types, including cross-border employment, pension income, and investment portfolios.
FAQ
Yes. The US and Mexico tax treaty – formally the US-Mexico Income Tax Convention – entered into force on December 28, 1993, and has been effective for most income tax provisions since January 1, 1994.
No. The US does have a tax treaty with Mexico, but Article 1(3) – the saving clause – preserves the US right to tax its citizens worldwide as if the treaty did not exist. US citizens in Mexico still file and pay US tax on worldwide income; the treaty mainly helps with withholding rates and double-taxation relief under Article 24.
The saving clause is Article 1(3) of the 1992 convention. It allows the United States to tax its citizens as if the treaty had not been signed. The exceptions under Article 1(4) include Article 9(2), Article 19(1)(b) and (3), Articles 22, 24, 25, and 26 – and for non-citizens and non-green card holders, Articles 20, 21, and 28 also apply.
Article 10 sets a maximum US-Mexico tax treaty dividend withholding rate of 5% if the beneficial owner holds at least 10% of the paying company's voting stock, and 10% in all other cases. These rates cap the withholding applied by the source country on dividends paid to residents of the other country.
US-Mexico tax treaty interest rates are set by Article 11 at 3 levels: 4.9% for bank loans, institutional lenders, and publicly traded bonds; 10% for other bank-paid interest and seller financing; 15% in all other cases. The applicable rate depends on the type of creditor and the nature of the underlying debt instrument.
Article 12 caps US-Mexico tax treaty royalties withholding at 10% of the gross royalty amount. The rate requires the recipient to be the beneficial owner and to satisfy the Limitation on Benefits test under Article 17.
Article 4(2) provides 4 sequential tiebreaker rules: (1) permanent home, (2) center of vital interests, (3) habitual abode, (4) nationality. The first test that produces a definitive answer governs treaty residency. If no test resolves it, the competent authorities of both states settle it by mutual agreement.
No. As of March 2026, Mexico has no Social Security Totalization Agreement in force with the United States – a 2004 agreement was signed but has not entered into force. Self-employed US citizens in Mexico may owe both US self-employment tax and Mexican IMSS contributions simultaneously – without the dual-coverage relief a Totalization Agreement would provide.
Sometimes, Form 8833 is required for treaty positions that reduce or modify US tax, but reduced withholding rates and several common treaty exemptions are specifically excepted from the requirement. Failing to file Form 8833 when required carries a $1,000 penalty per occurrence under IRC § 6712.
Yes. Article 24 (Relief from Double Taxation) is explicitly excepted from the saving clause under Article 1(4). US citizens in Mexico can claim the Foreign Tax Credit on Form 1116 for Mexican taxes paid, up to the FTC limit – excess credits can generally be carried back one year and forward ten years. This mechanism works alongside, not instead of, other applicable treaty provisions.
Yes. Under Articles 5 and 7, a US business is taxable in Mexico only if it has a permanent establishment there – defined as a fixed place of business or a construction project lasting more than 6 months. A US freelancer working in Mexico for 183+ days per year is taxable under the fixed-base rule of Article 14.
