CUIL

CUIL (Código Único de Identificación Laboral) is the 11-digit identifier that ANSES assigns to employed workers in Argentina. It's used for pension contributions, health insurance, and unemployment insurance. Format: `XX-XXXXXXXX-X`. The first two digits indicate type (20 or 23 for men, 27 for women, 30 for legal entities); the middle 8 are the DNI; the last is the check digit computed via modulo 11 with weights `5,4,3,2,7,6,5,4,3,2`. CUIL vs CUIT — they share structure and algorithm: - **CUIL**: employed worker (issued by ANSES). - **CUIT**: self-employed or company (issued by AFIP). A person may first have a CUIL (when starting formal employment) and later a CUIT (when registering as self-employed). The number is often the same if the prefixes match, but formally they're separate procedures. Normadata validates CUIL with the same algorithm as CUIT — the only practical difference is the valid prefixes per type.