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How to Find Your RFC Using Your CURP

TaxesLast verified by Tulum Sorted: Sep 11, 2026

Already have a CURP but don't know your RFC? Mexico's SAT has an online tool that lets you check whether your CURP is already associated with an RFC and, if so, see your RFC number. You do not need to visit a SAT office or upload documents for this lookup.

Applies to: Anyone who already has a Mexican CURP and needs to find their associated RFC. Your RFC — Registro Federal de Contribuyentes — is your Mexican federal taxpayer registration number. This guide is for finding an RFC that may already be associated with your CURP, not for completing a new RFC registration.

What to Have Ready

Valid CURPYear of registrationPostal codeStateWhether you are an employee10-digit telephone numberCAPTCHA/security code

How To Do It

Step 1 — Open the SAT lookup

  1. 1Go to the SAT service called 'Consulta tu clave de RFC mediante CURP.'
  2. 2Use the 'Check Your RFC on SAT' button below to open the official SAT lookup in a new tab.
  3. Check Your RFC on SAT

Step 2 — Enter your information

  1. 1Enter your CURP and the additional information requested by SAT. All required fields must be completed.
The SAT RFC lookup form asks for your CURP and additional information to verify your identity. Source: SAT.

SAT Field Translations

Ingresa tu CURP
— Enter your CURP
Año de Inscripción
— Year of Registration
Código Postal
— Postal Code
Entidad Federativa
— State / Federal Entity
¿Eres Empleado?
— Are you an employee?
Teléfono (10 dígitos)
— Telephone Number (10 digits)
Escribe el texto de la imagen
— Enter the text shown in the image
Selecciona…
— Select…
Enviar
— Submit
Resultado
— Result
Concluir
— Finish / Close

Tip: SAT uses "Entidad Federativa" to mean the Mexican state associated with the information you are entering.

Step 3 — Click Enviar

  1. 1Enviar means Submit. SAT will validate the information against your CURP.
  2. SAT may show an error if a required field is missing, the postal code is not five digits, the CAPTCHA is incorrect, or the information does not match SAT's records.
SAT will flag missing or incorrect information before allowing you to continue.

Step 4 — Get your result

  1. 1If the information matches and your CURP is already associated with an RFC, SAT will display your RFC.
  2. If SAT cannot validate the information, it may show a message saying the validation information is incorrect. This does not necessarily mean you don't have an RFC — it may mean the information entered does not match what SAT has on file.
If SAT cannot validate the information, it shows a message that most validation fields are not correct. This does not necessarily mean you don't have an RFC.

Spanish You May Need

  • RFC: Registro Federal de Contribuyentes — your Mexican federal taxpayer registration number
  • CURP: Clave Única de Registro de Población — your unique population registry code
  • SAT: Servicio de Administración Tributaria — Mexico's tax administration service

Good to Know

You do not need an appointment, a SAT office visit, or paperwork just to use this online RFC lookup. Tulum Sorted Tip: If you already have a Mexican CURP, try this online lookup before making a trip to SAT just to find out what your RFC is — it could save you a trip.

Related Resources

Check Your RFC on SAT