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State Registration Validator

Validate Brazilian State Registration (Inscrição Estadual) for all 27 states. 100% free.

No sign-up 100% free Private

Enter the IE number and select the state

The result will appear here

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State Registration (IE) - Validation for All 27 States

Online State Registration Validator (IE) - Free and Instant

Our free online state registration validator (ie) performs instant validation using the official algorithm. Simply enter the number, click the button, and get an immediate result indicating whether the document number is valid or invalid. The validation checks digit verification, format correctness, and known invalid patterns to ensure accuracy.

Key Features

  • Instant validation using the official algorithm published by the Brazilian government
  • Support for both formatted and unformatted input
  • Detection of known invalid sequences and repeated digit patterns
  • Complete privacy with all processing done in your browser
  • Mobile-friendly responsive interface that works on any device
  • No registration or API key required for unlimited use

The validation algorithm follows the official specification published by the Brazilian government. The tool checks not only the mathematical validity of the check digits but also rejects commonly used test numbers and sequences of repeated digits that, while mathematically valid, are not real document numbers in use.

This tool runs entirely in your browser using JavaScript and no data is transmitted to any server, ensuring complete privacy and security for sensitive document numbers. It works offline once the page is loaded and provides instant feedback as you type your input.

Whether you are a developer testing form validation logic, an accountant verifying client documents, or simply need to check a number quickly, this free tool saves time and eliminates manual calculation errors. Combine it with our generator tools for comprehensive testing workflows.

Frequently Asked Questions

What is the Inscricao Estadual (IE)?
The IE (State Registration) is a number assigned to companies by the state tax authority (SEFAZ). It is required for businesses that conduct operations subject to ICMS tax.
Why does each state have a different format?
Each Brazilian state (SEFAZ) defines its own IE format, length, and check digit algorithm. The validator supports all 27 states.
Does the IE replace the CNPJ?
No. The IE and CNPJ are separate numbers. The CNPJ identifies the company at federal level, while the IE identifies it at state level for ICMS purposes. A company may have a CNPJ without an IE if it is exempt from ICMS.