You’re absolutely right — the RFC (Registro Federal de Contribuyentes) is a key element in doing business in Mexico. It’s essentially a tax identification number issued by the SAT (Mexico’s Tax Administration Service), and it’s required for almost all legal and financial transactions, including invoicing, opening a business bank account, and working with suppliers or clients in the country.

For international businesses entering the Mexican market, obtaining or verifying RFCs (either for your company or partners) is crucial for staying compliant with local regulations.

As for the tool you mentioned, Calcular RFC — yes, it’s a very handy and user-friendly resource. It helps generate RFCs based on official formats and also offers validation features to check if an RFC is correct. This is especially useful when you’re dealing with multiple clients or employees and need to ensure their information is accurate. you can also validate your RFC from calculadora RFC

In my experience, tools like this can save a lot of time and reduce errors, but always cross-check with the SAT when in doubt — especially for formal submissions.