NIF Generator

Generate Portuguese Tax Identification Numbers for testing

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About NIF Generator

NIF (Número de Identificação Fiscal) generator creates valid Portuguese tax identification numbers for testing and development. Generated NIFs follow the Modulo 11 check digit algorithm and official taxpayer type codes but are not associated with real Portuguese taxpayers.

Generate properly formatted NIF numbers with correct structure following the Portuguese Tax and Customs Authority (AT) rules. The tool generates NIFs for all taxpayer categories: individual persons (1/2), companies (5), sole traders and others, each with their correct first-digit code and valid Modulo 11 check digit.

Essential for testing Portuguese e-commerce platforms, accounting software, government portal integrations, and applications serving the Portuguese market. Ideal for European fintech applications, tax preparation tools, and any system that collects or validates Portuguese fiscal data.

All generated NIF numbers pass the official Modulo 11 checksum and use correct taxpayer category codes. This ensures your Portuguese-market applications handle fiscal identification data correctly during development and testing scenarios.

Key Features

  • Valid 9-digit NIF format
  • Modulo 11 check digit verified
  • All taxpayer category codes supported
  • Formatted and unformatted output
  • Individual and company NIF types
  • No association with real taxpayers

NIF Generator Frequently Asked Questions

Is a generated NIF valid for official use?

No. Generated NIFs pass the official Modulo 11 checksum and use valid taxpayer category codes, but they are not registered with the Portuguese Tax and Customs Authority (AT). They cannot be used for tax filing, business registration, or any official Portuguese government transaction.

What does the first digit of a NIF mean?

The first digit identifies the taxpayer category: 1 or 2 = natural person (individual), 3 = foreign natural person, 5 = legal entity (company), 6 = public body, 7 = other collective entity, 8 = sole trader, 9 = irregular taxpayer.

What checksum algorithm does NIF use?

Portuguese NIFs use a Modulo 11 algorithm. Each of the first 8 digits is multiplied by a weight decreasing from 9 to 2, the products are summed, and the check digit is 0 if the remainder is 0 or 1, otherwise 11 minus the remainder.

Can I generate company NIFs (starting with 5)?

Yes. The generator supports all NIF categories and generates random numbers within each category using correct first-digit codes and valid Modulo 11 check digits.

Is this tool GDPR-compliant?

All generation runs entirely in your browser with no data sent to our servers. Generated NIFs are fictional and not tied to any real person or company, so they carry no personal data concerns for legitimate testing use.

NIF Testing Best Practices

  • Never use real NIFs in test environments
  • Validate NIF format and Modulo 11 checksum in your application
  • Use these numbers only for development and testing
  • Distinguish NIF types by first digit in your validation logic
  • Follow GDPR guidelines when handling real Portuguese fiscal data

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