You’ve got your visa sorted, found an apartment in Roma Norte, and you’re ready to settle in. Then someone asks for your CURP. Your landlord needs your RFC. The bank won’t open an account without both. Welcome to Mexican bureaucracy — where two acronyms you’ve never heard of control your entire administrative life.
We’ve been through this process ourselves as hosts and business owners in Mexico City. Here’s the honest, practical guide to getting your CURP and RFC as a foreigner in 2026 — including the new Biometric CURP that changed everything in February.
What are CURP and RFC? The 30-second version
CURP (Clave Única de Registro de Población) is Mexico’s universal identity number — think Social Security Number. Every person in Mexico needs one: citizens, residents, even some foreigners on tourist entries. It’s an 18-character alphanumeric code tied to your name, birth date, and gender.
RFC (Registro Federal de Contribuyentes) is your tax ID number, issued by the SAT (Mexico’s IRS). You need it to open bank accounts, buy property, start a business, or issue invoices. Your RFC is built from your CURP — so you always need the CURP first.
The short version: CURP = who you are. RFC = your tax identity. You need CURP before RFC, and you’ll eventually need both.
The Biometric CURP: what changed in 2026
As of February 1, 2026, Mexico retired the traditional paper CURP. The new Biometric CURP is a physical plastic card — like a driver’s license — that includes your fingerprints, iris scan, facial photograph, and digital signature.
This isn’t optional. The traditional CURP is no longer accepted for official procedures: banking, notario público, immigration renewals, property transactions — all now require the biometric version.
Who needs the Biometric CURP?
If you hold a Temporary Resident or Permanent Resident card and plan to do anything official in Mexico — open a bank account, sign a lease through a notario, renew your residency, buy property — you need to upgrade. If you’re on a tourist entry (FMM) and just passing through for a few months, you likely don’t need one yet, though the rules are tightening.
How to get it: step by step
The process is in-person only. No online option.
Documents you need:
- Valid passport
- Current Mexican residency card (Temporal or Permanente)
- Your old/traditional CURP (if you have one)
- Proof of address in Mexico (utility bill, lease — no older than 3 months)
- Active email address
The process:
- Book an appointment at your nearest RENAPO module. In CDMX: citas.renapo.gob.mx/citas/. For other states, check your local Registro Civil website.
- Show up with your documents. A technician will scan all ten fingerprints, take a facial photo, perform an iris scan, and capture your digital signature.
- Receive your plastic card. The whole thing takes 20–30 minutes if your documents are in order.
Modules are active in Mexico City, Monterrey, Guadalajara, Puebla, and expanding nationwide. Wait times vary — CDMX appointments can be booked weeks out, so don’t leave this for the last minute.
What if you already had a traditional CURP?
Your 18-character code stays the same. The upgrade adds the biometric layer and replaces the paper/PDF with the physical card. You still need to go in person to complete the biometric capture.
What if you never had a CURP?
If you’re a new resident, the CURP is now issued automatically when INM processes your residency card — but the biometric enrollment is a separate step you need to complete at a RENAPO module. Don’t assume your INM-issued CURP covers the biometric requirement.
Getting your RFC as a foreigner
Once you have your CURP (biometric version in 2026), you can register for an RFC at the SAT. But here’s the critical thing most guides skip:
Your visa type determines what your RFC can do
| Visa status | RFC type | What you can do |
|---|---|---|
| Temporary Resident without work permit | Limited RFC | Open bank accounts, own property, report investments. Cannot issue invoices or work for Mexican companies. |
| Temporary Resident with work permit | Full/Business RFC | Issue invoices (CFDI), run a business, hire employees, bill Mexican clients. |
| Permanent Resident | Full/Business RFC | Same as above — full tax participation. |
| Tourist (FMM) | Not eligible | Cannot obtain an RFC. |
This distinction is a legal limitation, not a bureaucratic one. If you have a Temporary Resident visa without a work permit and you’re working remotely for foreign clients, a Limited RFC is enough for banking and property. But you cannot legally invoice Mexican companies or earn Mexican-source income without upgrading your immigration status first.
RFC registration: what you need
Book an appointment at your local SAT office: citas.sat.gob.mx
Bring originals + 2 photocopies of each (SAT offices rarely have copiers — learn from our mistakes):
- Valid passport — the same one used for your visa application
- Mexican residency card (Temporal or Permanente)
- Biometric CURP card (or CURP printout from the official site)
- Proof of address — CFE electricity bill is the gold standard. Must be less than 3 months old. Key tip: it doesn’t need to be in your name. The account holder can accompany you with their ID and a simple authorization letter.
- Pre-Capture Form (Forma Precaptura) — generated online through the SAT portal before your appointment. Fill it out, print it, bring it.
For specific situations:
- With a work permit: bring your Employer Registration Certificate (CIE) or company incorporation documents
- Business partners/shareholders: articles of incorporation and RFC of the company
- Minors: birth certificate, guardian’s ID, legal guardianship documents
What happens at the SAT office
The appointment itself is straightforward if your paperwork is complete:
- The officer reviews your documents
- Your data is entered into the system
- You receive your RFC number
- You’re issued your e.Firma (electronic signature) — a cryptographic file that is your legal digital identity
About the e.Firma: This is not a PDF you can casually lose. It’s a digital certificate you’ll need to file taxes, issue invoices, and sign official documents electronically. The password is irrecoverable — if you lose it, you must schedule a new appointment to reissue the entire e.Firma. Write it down. Store it safely. We cannot stress this enough.
Common reasons for RFC rejection
Even with every document, applications get rejected. The most common reasons:
- Wrong proof of address format — the document must match Annex 1-A of the RMF 2025 exactly
- Expired utility bill — must be within the last 3 months
- Errors in the Pre-Capture form — double-check every field before printing
- Language barrier — misunderstanding a question from the SAT officer can derail the process
- The human factor — different SAT offices interpret rules differently. A document accepted in one office may be rejected in another.
If rejected, you’ll need to correct the specific issue and schedule a new appointment. This can add weeks or months to the process.
The practical order of operations
Here’s the sequence that actually works, based on our experience:
- Get your residency card from INM (Temporary or Permanent)
- Complete Biometric CURP enrollment at a RENAPO module (even if INM already assigned a CURP number)
- Register for RFC at SAT with your biometric CURP and residency card
- Safeguard your e.Firma — back it up immediately
- Open a Mexican bank account — now you have everything they’ll ask for
Total time from residency card to functioning bank account: 2–6 weeks depending on appointment availability and whether anything gets rejected.
Do you actually need both?
It depends on your situation:
- Short-term nomad (1–5 months on tourist entry): You don’t need either. Use your international bank card (Wise, Schwab) and move on with your life.
- Long-term resident, no Mexican income: You need both CURP and RFC to open a proper bank account, sign a notarized lease, or buy property — even if you never earn a peso in Mexico.
- Working or doing business in Mexico: You need both, plus the correct visa type (with work permit). The RFC must be a full/business RFC, not limited.
- Property investor: Both required. The notario won’t proceed without your RFC for any real estate transaction.
Taxes: the part nobody wants to think about
Having an RFC doesn’t automatically make you a Mexican taxpayer. Tax residency is determined by spending more than 183 days in Mexico in a calendar year — not by having an RFC.
But here’s the nuance: if you have a business RFC and you’re invoicing, you have tax obligations regardless of how many days you spend in Mexico. And if you’re a resident with a limited RFC earning foreign income while living here more than 183 days, you technically have a filing obligation under Mexican law, even though enforcement against remote workers receiving foreign income is rare.
This is where a Mexican accountant earns their fee. An hour-long consultation costs 500–1,500 MXN and can save you from surprises.
Key resources
- RENAPO appointments (Biometric CURP) — schedule your biometric enrollment
- SAT appointments (RFC) — schedule your RFC registration
- INM (Instituto Nacional de Migración) — residency and immigration status
- INEGI UMA values — updated annually, used for financial thresholds
- SAT official RFC inscription page — requirements and forms
Information in this guide reflects the 2025 Miscellaneous Tax Resolution (RMF 2025) and the Biometric CURP rollout as of early 2026. Requirements change — especially appointment availability and document interpretation at individual offices. When in doubt, verify with the specific SAT or RENAPO office where you plan to apply.