CPF vs SSN vs ITIN: Tax ID Numbers Explained

The Direct Answer

Brazilian expats in the US need to understand three tax IDs: the CPF (used in Brazil), the SSN (the US standard for work-authorized residents), and the ITIN (the IRS alternative for those without an SSN). You cannot substitute one for another on US tax forms. The CPF has no validity on IRS documents.

The CPF (Cadastro de Pessoas Fisicas)

The CPF is Brazil's individual taxpayer identification number, issued by the Receita Federal (Brazilian IRS). It is an 11-digit number in the format XXX.XXX.XXX-XX.

When You Need Your CPF

• Filing your annual Brazilian income tax return
• Opening or maintaining Brazilian bank accounts
• Owning, buying, or selling real estate in Brazil
• Accessing INSS benefits or requesting a Certificate of Coverage
• Managing investments in Brazil (stocks, funds, savings accounts)
• Receiving wire transfers to Brazilian accounts

Does the CPF Expire or Get Cancelled?

The CPF can be suspended or cancelled if you fail to file Brazilian tax returns for several consecutive years or if you have outstanding debts with the Receita Federal. Brazilian expats who still have financial ties to Brazil should maintain their CPF in good standing, which generally means filing a Brazilian return annually (or requesting a formal suspension of filing obligation for those who qualify).

The SSN (Social Security Number)

The Social Security Number is issued by the US Social Security Administration. It is the primary tax identification number for individuals in the US and appears on W-2 forms, 1099s, and all personal tax returns.

Who Can Get an SSN

Using Your SSN

Once you have an SSN, it replaces the ITIN for all future US tax filings. If you previously filed with an ITIN and later obtained an SSN, you must notify the IRS to link the two numbers and ensure your prior tax history is correctly consolidated.

The ITIN (Individual Taxpayer Identification Number)

The ITIN is issued by the IRS specifically for individuals who have a US tax filing obligation but are not eligible for an SSN. It is a 9-digit number beginning with the digit 9 and formatted as 9XX-XX-XXXX.

Who Needs an ITIN

• Non-resident aliens required to file a US return (for example, on US-source income)
• US residents without work authorization who have tax obligations (such as a spouse of an H-1B holder who does not have their own work authorization)
• Foreign nationals with US investment income or rental income
• Dependents claimed on a US return who are not eligible for an SSN

Applying for an ITIN

You apply using Form W-7 (Application for IRS Individual Taxpayer Identification Number). The application requires:

• A completed Form W-7
• A valid federal income tax return (unless an exception applies)
• Identification documents (such as a passport) - originals or certified copies

ITINs must be renewed if you have not filed a US return in the past 3 consecutive tax years or if certain digits in your ITIN fall in a range flagged for renewal by the IRS.

Consequences of Using the Wrong ID

CPF and SSN/ITIN Together

You may need both simultaneously. A Brazilian expat living in the US on an H-1B visa might have:

• An SSN for US employment, tax filing, and credit applications
• A CPF for managing their Brazilian bank account, rental property, or INSS contributions

The two numbers operate in separate tax systems and serve distinct purposes. There is no conflict in having both - most Brazilian expats will need both for the foreseeable future.

Understand Your Filing Requirements

Whether you need an SSN, an ITIN, or both - and whether your CPF is triggering Brazilian filing obligations - depends on your specific residency and financial situation. Start the free 5-minute diagnostic to clarify exactly which tax IDs and forms apply to you.