Freelancing in Mexico as an American:
the self-employment tax nobody warns you about.

The Double Tax Burden for American Freelancers in Mexico

As an American freelancer in Mexico, you potentially owe taxes to three entities: the IRS (income tax + self-employment tax), Mexico's SAT (income tax if you're a tax resident), and potentially your former US state. The good news: treaties and exclusions prevent actual triple taxation. The bad news: structuring it correctly requires understanding how all three interact.

US Self-Employment Tax: 15.3% That FEIE Doesn't Cover

The Foreign Earned Income Exclusion (FEIE) only excludes income from federal income tax. It does not exclude self-employment tax. If you earn $100,000 freelancing, you qualify for FEIE, and your income tax drops to near zero — but you still owe approximately $15,300 in self-employment tax (12.4% Social Security + 2.9% Medicare). This catches almost every American freelancer in Mexico by surprise.

The Totalization Agreement: Can It Help?

The US-Mexico Social Security Totalization Agreement can prevent you from paying social security taxes to both countries simultaneously. If you're contributing to Mexico's IMSS system, you may be exempt from the US Social Security portion (12.4%) of self-employment tax. However, you'd still owe the Medicare portion (2.9%). The guide covers exactly how to claim this exemption and the documentation required.

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Registering as a Freelancer with Mexico's SAT

If you're a Mexican tax resident (183+ days), you should register with SAT under either the standard professional services regime (Actividad Empresarial y Profesional) or RESICO. Registration requires an RFC number, FIEL/e.firma electronic signature, and proof of tax address. The guide covers the entire registration process and which regime is better for your income level. Full RESICO breakdown →

Issuing Facturas (Electronic Invoices) in Mexico

If you're registered with SAT, you must issue facturas (CFDI electronic invoices) for all income. This applies even to income from US clients. You can issue facturas through SAT's free portal or use third-party services like Facturama, MyFactura, or Contpaq. The guide includes a step-by-step process for issuing your first factura and what information to include for foreign clients.

Can I Deduct Mexican Business Expenses on My US Return?

Yes. Ordinary and necessary business expenses incurred in Mexico (office rent, coworking membership, internet, equipment, travel to client meetings) are deductible on your US Schedule C, just as they would be if you were freelancing in the US. Keep receipts and records in both currencies. The guide lists the most commonly missed deductions for American freelancers in Mexico.

Quarterly Estimated Tax Payments to Both Countries

Mexico requires monthly provisional tax payments (pagos provisionales) to SAT. The US requires quarterly estimated tax payments (Form 1040-ES). You'll need to manage payment calendars for both countries. The guide includes a combined payment schedule showing when each payment is due and how to calculate the amounts. Full tax overview →