Brazil to introduce alphanumeric CNPJ format from July 2026, requiring system updates

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Brazil's tax authority will begin issuing alphanumeric CNPJs — containing both letters and digits — to new businesses starting July 31, 2026, under regulation IN RFB nº 2.229/2024. The first 12 positions of the CNPJ identifier will accept characters from 0–9 and A–Z, while the two verification digits remain numeric. Existing all-numeric CNPJs will not change, meaning both formats will coexist indefinitely. Legacy systems that rely on numeric-only database columns, digit-only regular expressions, or numeric input masks will need to be updated to handle the new format. A developer has published an open-source JavaScript package called valida-cnpj-alfanumerico to help teams validate, format, and generate test data for the new alphanumeric standard.

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