What Is a CNPJ and When Does Your Company Need One?

The CNPJ (Cadastro Nacional da Pessoa Jurídica, the national registry of legal entities) is the number that identifies each company before Brazil's Federal Revenue. It works as the company's ID: without a CNPJ you cannot issue invoices, open a business bank account, hire employees or sign most contracts with Brazilian companies. A foreign company only needs a CNPJ in specific situations, such as being a partner in a Brazilian company or holding assets and investments in the country.

How the CNPJ works

The number has 14 positions in the format 00.000.000/0001-00:

• the first 8 identify the company;
• the middle 4 identify the establishment (0001 is the head office; branches get 0002, 0003 and so on);
• the last 2 are check digits.

Each CNPJ is linked to public data: legal name, address, registration status, opening date, activities (CNAE codes) and partners. Anyone can look up this data on the Federal Revenue website. That is why Brazilian companies usually check a supplier's CNPJ before closing a deal.

CNPJ and CPF: the difference

The CPF is the registry for individuals. The CNPJ is the registry for companies. In everyday online commerce, both show up all the time:

• consumers enter their CPF at checkout, because it is used on the invoice, in fraud checks and in payment methods such as boleto and Pix;
• business buyers enter their CNPJ to receive the invoice in the company's name.

If you sell to Brazilians, your purchase form must accept and validate CPF and CNPJ. This is part of localizing your product for Brazilian Portuguese.

When a foreign company needs a CNPJ

Having a CNPJ does not necessarily mean operating in Brazil. The most common cases are:

Situation	CNPJ needed?
Selling to Brazilians from abroad through an international payment processor	Generally, no
Being a partner in a Brazilian company	Yes, the foreign company needs its own CNPJ
Holding real estate, equity stakes or certain financial investments in Brazil	Yes
Opening a Brazilian company (subsidiary)	Yes: the subsidiary will have its own CNPJ

For the full setup path, see how to open a company in Brazil as a foreigner. If you want to test the market first, read selling in Brazil without a local company.

What a CNPJ lets you do

With a Brazilian company and its CNPJ, you can:

• issue Brazilian invoices (nota fiscal), which corporate customers require;
• receive payments in reais through local methods without a foreign intermediary;
• hire employees on formal contracts;
• sell on marketplaces as a local company;
• take part in tenders and sign contracts with large Brazilian companies.

The alphanumeric CNPJ

The Federal Revenue is introducing the alphanumeric CNPJ: new numbers may have letters and numbers in the first 12 positions, keeping the two numeric check digits. Existing CNPJs keep their current numbers.

For foreign companies selling in Brazil, this has a practical effect: systems that validate CNPJs (checkout, B2B customer sign-up, billing, CRM) must accept letters. A field that only accepts digits will reject legitimate customers. Ask your engineering team to review the validation.

CNPJ and the tax reform

Brazil's tax reform, regulated by Complementary Law 214/2025, changes how consumption taxes are calculated through 2033. The CNPJ remains at the center: it is how a company will report and offset the new taxes. See the details in Brazil's tax reform: what changes for companies selling in Brazil.

Summary

The CNPJ is a company's identity in Brazil and the gateway to issuing invoices, hiring and getting paid locally. A foreign company can sell here for a while without one, but will need one when it wants to be a partner in a Brazilian company or operate as a local business. If you are deciding when to take that step, BrazilDoor can help you assess the right moment.