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CUIT checksum validator
Enter an 11-digit CUIT and verify the check digit using the standard weighted modulo algorithm — entirely in your browser. Useful before invoicing or banking forms. Format success does not prove AFIP registration.
How to use
- Paste 11 digits (with or without hyphens).
- Read whether the check digit matches.
- Confirm the CUIT on your AFIP Constancia if needed.
What the tool does
Runs the official-style CUIT check-digit algorithm on-device.
What the tool does not do
Does not query AFIP or prove the CUIT is active.
Tips
- Strip hyphens before comparing to paperwork.
- CUIT type prefixes (20/23/24/27/30…) must match the entity.
FAQ
- Official AFIP lookup?
- No — checksum only.
- Is data uploaded?
- No.
- Is it free?
- Yes.
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