RFC, SAT and taxation in Mexico: a complete guide for expats in Cancún

The SAT: the Mexican tax authority

The Mexican tax system rests on a central authority called the SAT (Servicio de Administración Tributaria). Anyone living or earning income in Mexico must deal with this body.

Roles of the SAT

Registration

Assigning the RFC to each taxpayer — individual or company

Collection

Collecting ISR (income tax) and IVA (VAT)

Oversight

Checking monthly and annual returns

Obligations

Managing CFDI electronic invoices and penalties for non-compliance

The RFC: your tax ID

The RFC (Registro Federal de Contribuyentes) is your tax identifier in Mexico. It is essential for:

• Working legally in Mexico
• Issuing electronic invoices (CFDI)
• Opening certain bank accounts
• Signing certain types of contracts
• Reporting your income to the SAT

Without an RFC, your administrative integration remains severely limited. This step should be planned from your first weeks after arrival.

You must obtain an RFC if you work in Mexico, receive local income, carry out freelance activity or own a property that generates income.

The main tax regimes

Mexico offers several regimes suited to different profiles. The choice of regime has a direct impact on your obligations and your tax burden:

Tax rates

Rates vary by regime and income level. For reference in 2026:

Your obligations once registered

Once registered with the SAT, several recurring obligations must be met:

• Monthly income returns
• Mandatory annual return
• Issuing CFDI electronic invoices
• Rigorous tracking of income and expenses

Failing to meet these obligations can lead to financial penalties and complicate your administrative situation.

The most common mistakes

• Not registering for the RFC on arrival
• Choosing a tax regime unsuited to your profile
• Not declaring your Mexican income
• Mixing personal and business accounts
• Ignoring the monthly reporting obligations

Conclusion

Taxation in Mexico is not an obstacle, but a structuring element of your move. A rigorous approach — choosing the right regime, registering for the RFC, meeting your obligations — helps you avoid mistakes and secure your situation for the long term.

Smart Investment Riviera Maya supports its clients in structuring their tax situation in line with their overall move, working with local accountants and tax specialists.