Last Updated: April 2026
The US-Mexico border region is one of the world's most economically integrated — from the maquiladora manufacturing corridor along the border to the thousands of US nationals who live in Tijuana, Juarez, or Monterrey while working, or vice versa. US citizens working in Mexico face complex dual-filing obligations: Mexico's ISR income tax applies to Mexican-source income, while US citizenship creates a global filing obligation. Unlike many US trading partners, the US and Mexico lack a totalization agreement — the treaty mechanism that prevents double social security contributions — creating a significant additional cost for cross-border employment. The US-Mexico income tax treaty (1994) provides some relief on income taxes but does not cover social insurance.
Managing the US-Mexico tax situation requires careful planning around both income and social security:
FEIE vs FTC on ISR: If you earn employment income in Mexico, FEIE can exclude up to $130,000. If your income exceeds that or includes passive income, FTC on Mexican ISR can offset US liability. Because Mexico's ISR rates reach 35%, FTC frequently eliminates remaining US income tax. The double-taxation problem on income is generally manageable — the social security double-hit is harder to avoid.
Self-employed in Mexico: US self-employed workers in Mexico owe both Mexican ISR (on Mexican-source income) and US self-employment tax (15.3% on net SE income globally) with no totalization treaty to eliminate the US SE portion. Some US self-employed workers minimize this by ensuring their service income qualifies as non-US-source — but this requires careful structuring and advice.
RFC number: Get your RFC as soon as you begin working in Mexico. Without an RFC, Mexican employers cannot properly process payroll, and you cannot file Mexican tax returns. The RFC is obtained from SAT (Mexico's IRS) — US expats can get one at a SAT office with passport and proof of address.
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Transfer USD to MXN with Low Fees →If you live in the US (are a US tax resident) and work remotely from the US for a Mexican company, US tax rules apply to your wages as US-source earned income. Mexico may or may not claim taxing rights depending on whether a permanent establishment exists. Generally, services performed on US soil are US-sourced. You would owe US federal and state income tax on those wages. Mexico's ISR applies to income from Mexican sources — services performed in the US for a Mexican employer are typically not Mexican-source income unless you spend time physically working in Mexico. The Mexican company would not normally withhold Mexican income tax on your wages, but IMSS implications should be verified with a Mexican payroll specialist.
No. IMSS (Instituto Mexicano del Seguro Social) is Mexico's social security system. Social security/social insurance contributions are not creditable as foreign income taxes on the US Form 1116 Foreign Tax Credit. The FTC only applies to taxes levied on net income (income taxes). IMSS contributions, like US Social Security taxes, are social insurance premiums — not income taxes. This is why the absence of a US-Mexico totalization agreement is so significant: there is no mechanism to prevent double-payment of both IMSS and US Social Security on the same earnings, and neither system offers a credit for the other's contributions.
Daily commutes across major US-Mexico border crossings (San Ysidro/Tijuana, El Paso/Juarez, Laredo, McAllen/Reynosa) are common for thousands of workers. SENTRI (Secure Electronic Network for Travelers Rapid Inspection) passes allow frequent commuters to use dedicated fast lanes — significantly reducing wait times from 1–3 hours to 15–30 minutes. From a tax perspective, daily commuters who maintain their primary residence in the US and work in Mexico are US tax residents and Mexican source-income taxpayers. Days physically in Mexico performing work create Mexican ISR obligations. US-Mexico daily commuters often use Wise for peso transfers to cover Mexican expenses without bank wire fees.
If you are a Mexican tax resident (primary residence in Mexico or 183+ days), Mexico taxes your worldwide income — including US dividends, US interest, US rental income. Mexican ISR rates reach 35% on high income. The US-Mexico tax treaty prevents formal double taxation: Mexican taxes on Mexican-source income are creditable against US tax; treaty tie-breakers determine primary residency when both countries might claim you. The practical result for most US-Mexico residents: Mexico taxes their Mexican income; FTC covers the US liability on that Mexican income; US-source passive income remains primarily US-taxed with a potential Mexican credit. A dual-country tax specialist is essential for Mexican tax residents with significant US assets.