RFC and CURP Generator

Mexican tax IDs for test data

Generate RFC and CURP codes in official Mexican format for testing, demos and forms. Random mode or calculator with real data. Everything runs in your browser.

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How the RFC is built

1Position 1: First letter of first surname
2Position 2: First internal vowel of first surname
3Position 3: First letter of second surname
4Position 4: First letter of first name
5Positions 5-10: Birth date (YYMMDD)
6Positions 11-13: Homoclave (assigned by SAT)

Frequently asked questions

RFC and CURP generator: Mexican fiscal identity documents

RFC (Federal Taxpayer Registry) and CURP (Unique Population Registry Code) are the two most important fiscal and personal identity documents in Mexico. Both are generated from biographical data following official SAT and INEGI algorithms.

RFC structure

RFC has 13 characters for individuals: 4 letters from the name (first letter of paternal surname + first internal vowel + first letter of maternal surname + first of first name), date of birth (6 digits: YYMMDD) and 3 digits for homonymy and verification.

CURP structure

CURP has 18 characters: 4 name letters (same as RFC), birth date, sex letter (H/M), 2-letter code of birth state, 3 internal consonants from the name, 2 alphanumeric verification characters.

Uses of RFC and CURP

RFC: electronic invoices, tax returns, employment contracts.
CURP: educational and social security procedures (IMSS, ISSSTE, INFONAVIT).
Both: opening bank accounts, official identification.
Software development: data validation in Mexican forms.

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