Information for your next step
Clear, practical guides.
Understand your identifiers and find the official service you need.
Mexican taxpayer registry (RFC)
How to look up your official RFC with your CURP
Find the RFC registered with SAT and understand the difference between calculating, looking up and verifying a Mexican RFC.
Generic RFC: domestic and foreign recipients
Find XAXX010101000 and XEXX010101000, their differences and the SAT guidance on using generic RFCs.
Check the format of a Mexican RFC
Check an individual or company RFC’s length, date and check digit locally, without sending your details.
What is an RFC and how is it formed?
Understand the 13 characters of an individual’s Mexican RFC, the homoclave and the differences from CURP.
Print your RFC and obtain an official certificate
Understand the difference between a calculator result and an official SAT Constancia de Situación Fiscal.
How to correct or update your RFC details
What to check when your RFC details do not match your documents and how to use official SAT channels.
A company’s RFC: what it is used for
How a company RFC differs from a personal RFC and how to confirm a business’s registered key.
CURP and social security
Look up your NSS with IMSS
Recover your Mexican social security number through the official IMSS service using your CURP and email address.
Look up your official CURP
Get your CURP from the official portal and understand why a calculated key does not replace a RENAPO certificate.