CUIT Validator

Verify an Argentine Clave Única de Identificación Tributaria (CUIT) and decode the entity type from the prefix.

Format: XX-XXXXXXXX-V — 11 digits total. Dashes optional.

Prefix Reference

Try these examples

Algorithm

The CUIT uses an AFIP modulo-11 algorithm. The 10 digits (excluding check digit) are multiplied left-to-right by weights [5, 4, 3, 2, 7, 6, 5, 4, 3, 2]. Sum mod 11: if 0 → check = 0, if 1 → check = 9 (generally invalid), otherwise check = 11 − remainder.