Argentina CUIT Validation
Validate CUIT Number in Argentina Online
Quickly and accurately validate CUIT (Clave Única de Identificación Tributaria) for companies and individuals registered with Argentina's ARCA tax authority (formerly AFIP).
Understanding Argentina CUIT Format
The CUIT is an 11-digit number formatted as XX-XXXXXXXX-X, where the prefix encodes the taxpayer type and the final digit is a checksum.
(Entity Type)
Digits
Digit
- ✓ Type Prefix: Two digits encoding the taxpayer category — 20 (male individual), 23/24 (female individual), 27 (married female filing jointly), 30 (company), 33 (temporary entity).
- ✓ Serial Number: Eight digits uniquely assigned by ARCA (Agencia de Recaudación y Control Aduanero, the successor to AFIP since October 2024) at the time of registration.
- ✓ Check Digit: A single digit calculated via a modulo-11 algorithm to detect transcription errors in the full 11-digit sequence.
Frequently Asked Questions
What is the Argentina CUIT?
The CUIT (Clave Única de Identificación Tributaria) is Argentina's primary tax identifier, issued by AFIP to all legal entities — corporations, trusts, NGOs, and self-employed individuals. Individuals who are not self-employed use the related CUIL number. The CUIT is required for every formal economic transaction in Argentina. Validate any CUIT in real time with Lookuptax before onboarding a new supplier or partner.
Who needs a CUIT?
Any person or entity that engages in taxable economic activity in Argentina must obtain a CUIT. This includes corporations (SRL, SA), branches of foreign companies, freelancers (monotributistas), public entities, and non-profits. Foreign companies operating in Argentina also receive a CUIT. Lookuptax helps you verify that any counterparty's CUIT is active and correctly registered with AFIP.
What if a CUIT is invalid or inactive?
An invalid CUIT either fails the modulo-11 checksum or does not exist in AFIP's registry. An inactive CUIT means the entity has been suspended or deregistered. Accepting invoices from an inactive CUIT can result in disallowed tax credits and regulatory fines. Lookuptax flags both format errors and inactive statuses so your compliance team can act before problems escalate.
How do I integrate CUIT validation into my billing system?
The Lookuptax API provides a single REST endpoint that accepts the country code "AR" and the CUIT value, returning validation status, entity name, and registration details in JSON. You can embed this call directly into your ERP, billing platform, or KYC workflow. Register at platform.lookuptax.com to get your free API key and start validating CUIT numbers programmatically today.
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