Verify a Colombian Número de Identificación Tributaria (NIT) check digit using the official DIAN algorithm.
Format: XXXXXXXXX-V — 9 base digits + check digit, or just 9–10 digits.
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Algorithm
The NIT check digit uses the DIAN modulo-11 algorithm. Each of the 9 base digits is multiplied by a fixed weight (positions right to left: 3, 7, 13, 17, 19, 23, 29, 37, 41). The sum is divided by 11; if remainder = 0 → check = 0, if remainder = 1 → check = 1, otherwise check = 11 − remainder.
This tool validates the check digit format only. For official verification, consult the DIAN registry (Colombia).