RFC and CURP in Mexico for Expats: The Key IDs (2026)

Two acronyms shape daily bureaucracy for newcomers: the CURP and the RFC. This guide to RFC and CURP in Mexico explains what each identifier is, how to obtain them, and why you cannot bank, work or rent without them.

Why RFC and CURP in Mexico Matter

The CURP (Clave Única de Registro de Población) is your unique population ID, a string of letters and numbers tied to your name and birth details. The RFC (Registro Federal de Contribuyentes) is your tax ID, issued by the tax authority SAT.

Together, RFC and CURP in Mexico unlock almost everything an expat needs: opening a bank account, signing a lease, taking a job, registering for healthcare and receiving proper invoices.

Getting Your CURP

If you obtain a resident card, INM generates your CURP as part of the process. You can then look it up and print it for free from the federal government portal whenever a form requires it.

Check that your CURP spells your name exactly as it appears on your passport, including the order of surnames, because mismatches cause problems later.

Registering for the RFC at SAT

To get an RFC you book an appointment (cita) at a SAT office and bring your CURP, passport, resident card and a recent proof of address. SAT issues your RFC and a constancia de situación fiscal, the certificate that businesses and banks will ask to see.

Many residents also set up the e.firma, a digital signature that lets you file taxes and sign documents online.

Where You Will Use Them

Expect to provide both IDs when opening accounts, starting employment, buying property, contracting utilities and requesting a CFDI, the official electronic invoice used across Mexico.

Employers withhold tax against your RFC, and landlords increasingly ask for it so they can invoice rent correctly.

Common Pitfalls

The most frequent issues are accents and double surnames that appear inconsistently across documents. Keep your spelling identical everywhere and carry a printed constancia.

If you never plan to work but still need to bank, ask the bank which document set it accepts; policies vary between branches.

Mexico Step-by-Step Guide (5 steps):
Step 1: Residency · Step 2: RFC & CURP · Step 3: Cost of Living · Step 4: Banking · Step 5: Healthcare