Guides & facilita.tools
In-depth articles on Brazilian regulations, APIs and technical standards.
What is CPF?
Understand the structure, validation algorithm, and the difference between active and cancelled CPF.
Alphanumeric CNPJ
The new CNPJ format under IN RFB 2.119/2022 — what changes in July 2026 and how to validate it.
IRRF Table 2026
Updated income tax withholding brackets per Law 15.270/2025, with practical calculation examples.
INSS Table 2026
Progressive INSS contribution brackets, salary ceiling and step-by-step calculation examples.
How PIX Works
Key types, static vs. dynamic QR Code, DICT directory, and how instant transfers work under the hood.
Verification Digits
Módulo 10 and Módulo 11 algorithms used in CPF, CNPJ, bank slips and NFe — step-by-step examples.
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