Brazil's Alphanumeric CNPJ: What Changes for Business

What exactly is changing with Brazil's CNPJ?

Brazil's Federal Revenue Service (Receita Federal) began issuing alphanumeric CNPJs on July 31, 2025, for all new business registrations. The 14-character structure stays the same, but the first eight digits (the root) and the next four (establishment order) can now include letters A–Z alongside numbers 0–9. Only the last two characters — the verification digits — remain purely numeric.

Why was this change necessary?

The purely numeric system offers a maximum of 100 million combinations. With more than 60 million active registrations already on file, exhaustion of available numbers was imminent. Alphanumeric combinations expand capacity dramatically, future-proofing the registry.

Does my existing CNPJ change?

No. Companies already registered keep their current number unchanged and do not need to update digital certificates or any official documents tied to the old format.

What does this mean for business systems?

The real work falls on technology teams. ERPs, invoice-issuance software, banking platforms, marketplaces and any form or database that treats the CNPJ field as numeric-only will need to be updated to accept letters. João Russio, technology manager at Mosten, warns that without this adjustment companies risk failing to onboard new clients or suppliers who already hold an alphanumeric CNPJ.

What are the financial and operational risks?

Accountant and finance specialist Simone Santolin highlights knock-on effects across fiscal, accounting, financial and commercial operations. Mismatched records can delay invoice issuance, hold up payments and squeeze cash flow. Integration errors with Receita Federal systems or commercial partners are also likely for businesses that lag behind.

How can companies test their readiness?

Russio recommends a simple check: try entering a CNPJ that includes letters in your current system. If the field rejects it or flags an invalid format, the system has not yet been updated and needs immediate attention.