ITIN vs SSN for Opening a Bank Account

Introduction

When we begin interacting with the U.S. financial system — opening a bank account, filing taxes, applying for credit — we quickly encounter two identification numbers that appear again and again.

The first is the Social Security Number, commonly referred to as an SSN. The second is the Individual Taxpayer Identification Number, commonly referred to as an ITIN.

For many of us who are new to the United States, these two numbers can be confusing. They look similar on paper — both are nine-digit numbers used for identification purposes. But they are issued by different government agencies, serve different purposes, and are available to different groups of people.

Understanding the difference between them — and knowing which one applies to our situation — is one of the most practical pieces of knowledge we can have when navigating financial life in this country.

This guide explains both numbers clearly, compares them directly, and explains how each one can be used when opening a bank account in the United States.

What Is a Social Security Number?

A Social Security Number is a nine-digit number issued by the U.S. Social Security Administration — a federal government agency.

The SSN was originally created to track earnings and administer Social Security benefits, which are retirement and disability payments funded through payroll taxes. Over time, it became the primary identifier used across the U.S. financial and government systems.

Today, an SSN is used for a wide range of purposes.

Employment. Employers use SSNs to report wages to the government and withhold the correct amount of taxes from paychecks. In the United States, having an SSN is a requirement for legal employment.

Tax filing. The IRS uses SSNs to process tax returns and track income reported by employers and financial institutions.

Credit history. When we open a credit card, take out a loan, or apply for other financial products, lenders use our SSN to report our payment activity to the credit bureaus. Our credit history is built and tracked using this number.

Government records. SSNs appear across government programs, benefits systems, and official records.

Banking. Most banks accept an SSN as the primary form of tax identification when opening an account.

Who receives an SSN? The Social Security Administration issues SSNs to:

• U.S. citizens
• Permanent residents (green card holders)
• Certain individuals with work authorization — such as those on specific visa types that permit employment in the United States

If we are not a citizen, a permanent resident, or someone with work authorization, we are generally not eligible for an SSN. This is where the ITIN becomes relevant.

What Is an Individual Taxpayer Identification Number?

An Individual Taxpayer Identification Number is a nine-digit number issued by the Internal Revenue Service — the U.S. federal tax authority, commonly known as the IRS.

The ITIN was created for a specific purpose: to allow people who have U.S. tax obligations to fulfill them, even if they are not eligible for a Social Security Number.

The United States taxes certain types of income regardless of immigration status. A foreign national who earns income in the United States, a nonresident who receives U.S.-source investment income, or an immigrant who is working through a tax treaty arrangement may all have tax filing requirements — but no eligibility for an SSN. The ITIN gives these individuals a way to file tax returns and comply with U.S. tax law.

People who commonly use ITINs include:

• Immigrants on certain visa types who are not eligible for work authorization
• Nonresident aliens with U.S.-source income
• International students earning income in the United States
• Spouses or dependents of U.S. citizens or residents who are not eligible for an SSN
• Certain individuals in the process of adjusting their immigration status

There is one thing about ITINs that we must understand clearly. An ITIN does not grant work authorization. It does not change our immigration status. It does not function as a form of legal residency or employment eligibility. Its sole purpose is tax identification — allowing the IRS to process our tax filings and payments.

An ITIN also does not expire in the traditional sense, but the IRS has rules about renewal when an ITIN has not been used on a tax return for a certain number of consecutive years. If we have an ITIN we obtained some time ago and have not used recently, it is worth verifying its current status with the IRS.

The Key Differences Between an SSN and an ITIN

Now that we understand each number individually, it helps to see the differences side by side.

Who issues it. An SSN is issued by the Social Security Administration. An ITIN is issued by the Internal Revenue Service.

Who is eligible. An SSN is available to U.S. citizens, permanent residents, and certain authorized workers. An ITIN is available to people who have U.S. tax obligations but are not eligible for an SSN.

Primary purpose. An SSN is used for employment reporting, tax filing, credit tracking, and government records. An ITIN is used specifically for tax identification and filing.

Employment authorization. An SSN is required for legal employment in the United States. An ITIN does not authorize employment and cannot be used in its place.

Credit reporting. Credit history is traditionally built and tracked using an SSN. However, some financial institutions can report credit activity using an ITIN as the identifying number, which means credit building is possible for ITIN holders in certain circumstances. We explain this in detail in our guide How to Build Credit in the U.S. Without a Social Security Number.

Banking. Most banks accept an SSN for account opening. Many banks also accept an ITIN, though additional documentation is typically required. We discuss this further in the next section.

How ITINs Are Used to Open Bank Accounts

This is one of the most practical questions for many of us — and the answer is encouraging.

Many banks in the United States accept an ITIN in place of an SSN when verifying identity for account opening. This is possible because the legal requirement for banks is to verify the identity of their customers — not specifically to collect an SSN. An ITIN satisfies the tax identification component of this verification for customers who are not SSN-eligible.

When we apply to open a bank account using an ITIN, banks will typically ask for a combination of documents to complete the verification process. Commonly requested items include:

• Our ITIN documentation
• A valid passport or foreign government-issued photo ID
• Proof of a U.S. address — such as a utility bill, lease agreement, or official mail addressed to us
• Visa documentation showing our current status in the United States
• For international students, proof of enrollment such as a university acceptance letter or I-20 form

The specific combination of documents required varies between institutions. Some banks are very familiar with ITIN-based account openings and have streamlined processes for it. Others may have less experience and may require additional steps or escalation to a manager.

This is why confirming requirements before visiting a branch is always a good idea. A quick phone call or online search can save us an unnecessary trip and help us arrive prepared.

We provide a broader overview of which institutions are most accessible to immigrants in our guide Best Banks for Immigrants in the United States.

How Both Numbers Interact with the Financial System

Beyond bank accounts, both SSNs and ITINs interact with the broader U.S. financial system in ways that are worth understanding.

Identity verification. When financial institutions open accounts, process loan applications, or report financial activity to the government, they use our identification number — SSN or ITIN — to attach that activity to our record. Both numbers serve this function within their respective eligible populations.

Tax reporting. Banks are required to report certain types of account activity — such as interest earned — to the IRS. They use the identification number associated with our account for this reporting. Both SSNs and ITINs can be used for this purpose.

Credit history. As mentioned earlier, credit history in the United States is traditionally linked to an SSN. However, some lenders and financial institutions are able to report credit activity using an ITIN as the identifier. This means that ITIN holders who open secured credit cards, credit builder loans, or other credit products with ITIN-compatible institutions can begin building a credit history — even without an SSN.

This is an important point for us to understand. The absence of an SSN does not necessarily mean the absence of a credit future. It means we need to be intentional about choosing financial institutions that support ITIN-based reporting.

What Happens When We Obtain an SSN Later

Many of us will eventually become eligible for a Social Security Number — through a change in employment authorization, a visa upgrade, or a shift in immigration status.

When that happens, an important question arises: what happens to the financial history we built using our ITIN?

The good news is that continuity is generally possible. Banks and credit institutions can often link our previous ITIN-based records to our new SSN. This allows the financial history we worked to build under our ITIN to be recognized and carried forward under our SSN.

The process for doing this varies by institution. For our bank account, we typically notify the bank of our new SSN and they update our records. For credit history, the credit bureaus have processes for associating ITIN-based records with a newly issued SSN.

This transition is not automatic in all cases, and it is worth following up with each institution individually to ensure our records are correctly linked. But the effort is worthwhile — preserving the financial history we built during our ITIN period means we do not start over when we obtain an SSN.

Confirming Requirements Before We Apply

One of the most consistent pieces of guidance throughout this article is worth restating clearly.

Banking requirements and identity verification policies vary between financial institutions. A bank that accepts ITIN in one state may have a different process in another. A branch that is experienced in working with international customers may handle non-standard documentation more smoothly than one that rarely encounters it.

Before visiting any bank to open an account, we should:

• Contact the institution directly — by phone or through their website — to confirm whether they accept ITIN for account opening
• Ask specifically what documents they require from customers who do not have an SSN
• Prepare a complete set of documents before the visit so the process goes smoothly

Being prepared is the difference between a successful first visit and an unnecessary delay.

For a complete walkthrough of how to approach opening a first bank account, our guides Can You Open a Bank Account Without a Social Security Number? and How to Choose Your First Bank Account in the U.S. cover the full process step by step.

Conclusion

An SSN and an ITIN are both nine-digit identification numbers used in the U.S. financial system — but they serve different purposes and are available to different people.

An SSN is issued to citizens, permanent residents, and authorized workers. It is used across employment, taxes, credit, and banking. An ITIN is issued by the IRS to individuals with U.S. tax obligations who are not eligible for an SSN. It does not authorize employment or change immigration status, but it does allow us to file taxes and, in many cases, to open bank accounts and begin building financial history in this country.

For immigrants who do not yet have an SSN, an ITIN is not a lesser alternative. It is the correct document for our situation — and understanding how to use it effectively is one of the most important financial steps we can take.

The U.S. financial system is navigable. It rewards people who understand how it works. And understanding the difference between these two identification numbers is a meaningful part of that foundation.

MARVODYN provides financial education for informational purposes only. This content is not financial advice. Banking requirements and identity verification policies vary between financial institutions and may change over time. Please verify all information directly with financial institutions before making decisions. See our full disclaimer at marvodyn.com.