Blog & Resources
Guides, tax news and tips for doing business in Mexico.
What is the RFC in Mexico and how to get it in 2026
The RFC is the tax number SAT assigns to every person or company in Mexico. Without it you cannot issue invoices, open a business bank account or meet your tax obligations. Complete guide including for foreigners.
ISR income tax for individuals in Mexico 2026: complete guide
ISR is the most important tax for individuals in Mexico. This guide explains who pays it, the 2025 progressive rates, how to calculate it by regime and how to reduce it legally.
SAT fines in Mexico 2026: how much you could end up paying
From $1,400 to over $97,000 MXN per violation, plus 1.47% monthly surcharges. Find out exact amounts for each type of non-compliance and how to reduce or waive SAT fines.
e.firma SAT: how to get and renew your electronic signature in 2026
The e.firma is required for refunds, audits and dozens of SAT procedures. Learn how to get it, renew before expiry and what to do if it already expired.
SAT balance in your favor: how to know and how to collect it in 2026
If you overpaid taxes, SAT owes you that money. We explain how to verify it, how to request the refund and what to do if SAT delays or denies it.
SAT Tax Mailbox: what it is and how to use it in 2026
The SAT tax mailbox is the only official channel for requirements, audits and fines. If you do not activate or check it, deadlines still run. Complete guide.
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