The number that unlocks everything in the US: do you know what a Social Security Number is?
- Murtaz Navsariwala
- 18 minutes ago
- 8 min read
There's a moment that almost every immigrant in the United States faces.
You've just arrived. Maybe you've gotten your work visa, maybe you've regularized your status, maybe you're starting a new life with authorization to work legally. And then, at your first job interview, when trying to open a bank account, when filling out a rental agreement, the same question appears:
"What is your Social Security Number?"
For many, this moment causes a combination of confusion and anxiety. What exactly is this number? Why does it seem to be required for absolutely everything? How do you get it? And what happens if you don't have one yet?
This article answers these questions clearly, without unnecessary jargon, so you understand what a Social Security Number is, what it's for, and how to take the right steps to obtain it.
Índice
What is a Social Security Number?
The Social Security Number (SSN) is a nine-digit identification number issued by the U.S. federal government through the Social Security Administration (SSA). It was originally created in 1936 to track the work records and Social Security contributions of Americans.
Decades later, the SSN has become much larger than its original purpose. Today, it functions in practice as a person's unique identifier within the American system—for income tax purposes, financial credit, formal employment, government benefits, and much more.
The format is always the same: XXX-XX-XXXX, three groups of digits separated by hyphens.
Contrary to what many people imagine, the SSN is not exclusive to U.S. citizens. Permanent residents (Green Card holders) and certain categories of temporary visa holders may also be eligible to obtain it.
What is it used for in practice?
Consider Ana, a marketing professional from Brazil who arrived in the U.S. on an H-1B visa. In the first few weeks, every step she tried to take ran into the same requirement.
Her employer needed her SSN to process her pay and fill out tax forms. The bank where she tried to open an account asked for the number to verify her identity. The landlord of the apartment she wanted to rent included her SSN on the application form. And when she went to a pharmacy and asked about health insurance, the clerk asked—again—for her Social Security Number.
In practice, the SSN is what connects a person to the formal functioning of the United States. It appears in situations such as:
Formal employment: employers are required to report salaries to the government using the employee's SSN for tax purposes.
Income tax return: every IRS (U.S. Internal Revenue Service) return uses the SSN as the primary identifier.
Opening a bank account: most banks require the SSN as part of the identity verification process.
Building a credit history: Your credit score in the US is linked to your SSN. Without it, it's as if you don't exist for the American financial system.
Renting property: Landlords frequently request the SSN to check the applicant's credit history.
Access to government benefits: Medicaid, Medicare, unemployment benefits, and other federal programs are linked to the SSN.
Enrollment in educational institutions: Universities and colleges frequently request the number for administrative and financial processes.
In short: without an SSN, it is extremely difficult to build a functional and formal life in the United States.
Who Can Apply for an SSN?
Those eligible for a Social Security Number (SSN) include:
U.S. citizens. Permanent residents (Green Card holders). Holders of certain nonimmigrant work visas, such as H-1B, H-2A, H-2B, H-3, J-1, L, O, P, Q, R, and TN. Holders of Employment Authorization Documents (EADs), including asylum seekers who have received EADs and some F-1 visa holders with work authorization (CPT or OPT).
An important detail: work authorization is, in most cases, a requirement to obtain an SSN. Individuals in tourist status or with a student visa without work authorization are generally not eligible.
If you have questions about whether your current status allows you to apply for an SSN, this is exactly the type of question an immigration attorney can clarify before you go to the SSA in person and receive a denial.
How to Request Yours
The process is simpler than many people imagine — but it requires attention to the necessary documents.
Step 1: Verify your eligibility
Confirm that your immigration status and work authorization are in order before anything else. An application made with incorrect or incomplete documentation will be denied, and an unnecessary denial can lead to complications.
Step 2: Gather the documents
The SSA requires you to prove three things: identity, age, and immigration status. Documents typically required include:
Valid passport
Current U.S. visa (if applicable)
Form I-94 (U.S. entry record) — can be obtained online at i94.cbp.dhs.gov
Green Card or EAD document (as applicable)
Documents proving work authorization (letter from employer, Form I-20 with CPT/OPT authorization, among others, depending on the case)
Step 3: Complete the SS-5 form
The SSN application form is Form SS-5, available for free on the official SSA website at ssa.gov. It can be completed online or on paper.
Step 4: Go to the SSA in person
Unlike many American processes that can be done remotely, applying for an SSN requires physical presence at a Social Security Administration office. Bring all original documents—copies are generally not accepted.
To find the nearest office, access the official locator at ssa.gov/locator.
Step 5: Wait for the card
After approval, the physical card with your number is mailed to the address you provided. Delivery usually takes two to four weeks. Keep this card in a safe place—you will rarely need to present it physically, but the number will be used for life.
What to do if you don't have one yet
Some immigrants arrive in the U.S. with status that doesn't yet allow them to apply for a Social Security Number (SSN) — or they are awaiting approval of documents like the Electronic Document Approval (EDA).
In this scenario, there are alternatives for specific situations:
For tax purposes, the U.S. Internal Revenue Service (IRS) offers the Individual Taxpayer Identification Number (ITIN), which allows you to file taxes even without an SSN. The ITIN does not replace the SSN for employment or benefits purposes, but it is a legitimate alternative for tax obligations.
To build a credit history before obtaining an SSN, some banks offer accounts without an SSN upon presentation of a passport and other identification documents. This is a temporary option, not a permanent replacement.
The most important message here: the temporary absence of an SSN should not be normalized as a permanent situation. If you are entitled to the number but have not yet applied for it, this is a priority that deserves attention now.
Protecting Your Number
Obtaining a Social Security Number (SSN) is only part of the story. Protecting it is equally important.
Identity theft is a serious problem in the U.S., and the SSN is often the central target. With it, fraudsters can open credit accounts, apply for loans, file taxes, and even obtain jobs in your name.
Some essential practices:
Never carry the physical card in your wallet. The number should be memorized, not displayed. Share the number only when strictly necessary and with trusted entities. Regularly monitor your credit history on websites like annualcreditreport.com. Be alert to unexpected correspondence from the IRS or SSA—these may be signs of misuse. If you suspect identity theft, contact the FTC (Federal Trade Commission) at identitytheft.gov.
Can an immigrant without a Green Card have a Social Security Number?
Yes, in certain situations. Holders of work visas such as H-1B, L-1, O-1, TN, and others, as well as individuals with Employment Authorization (EAD), are eligible to apply for a Social Security Number (SSN). Eligibility depends on work authorization, not necessarily permanent residency. U.S. citizens and permanent residents (Green Card holders) are also entitled to the number. Tourists and student visa holders without work authorization are generally not eligible.
What is the difference between SSN and ITIN?
The SSN (Social Security Number) is issued by the Social Security Administration and provides access to employment, benefits, and credit in the U.S. The ITIN (Individual Taxpayer Identification Number) is issued by the IRS exclusively for tax purposes and is intended for individuals who are required to file U.S. taxes but are not eligible for an SSN. The ITIN does not authorize employment, does not generate a credit history, and does not replace the SSN for any purpose other than tax-related ones.
How long does it take to receive a Social Security Number after applying?
After appearing in person at the SSA office with all the correct documents and having the application approved, the physical card is usually mailed within two to four weeks. In some cases, the number can be provided even before the physical card arrives, allowing the employer to begin the tax registration process.
Can I work legally in the US without a Social Security Number (SSN)?
Technically, it's possible to start working while waiting for your SSN in some cases—provided you already have work authorization in hand (such as an EAD or approved work visa). The employer can hire you and use a temporary number until the SSN arrives. However, the number will be necessary to process your first payslip correctly and for all subsequent tax obligations. Working without any type of work authorization is a serious violation of U.S. immigration law.
Has your Social Security Number expired or does it need to be renewed?
No. The SSN is lifelong and permanent. Once issued, the number remains the same forever, regardless of changes in name, marital status, or immigration status. The physical card can be replaced if lost or stolen, but the number itself does not change. The SSA limits the issuance of replacement cards to three per year and ten over a lifetime, as a security measure against fraud.
A Final Word
The Social Security Number is, in practice, the gateway to formal life in the United States. Without it, employment, credit, housing, and essential services become inaccessible or extremely complicated.
If you are eligible to apply for it, don't delay. If you don't yet have the necessary work authorization, understanding the path to get there is a priority.
The American system rewards those who understand the rules and act proactively.
Murtaz Law: Where each case is treated as unique.
Murtaz Law is an American law firm specializing in immigration to the United States, built with the goal of offering a strategic, human, and highly personalized approach to each case. With nearly two decades of accumulated experience in American immigration law, the firm has helped professionals, families, entrepreneurs, artists, and athletes transform complex processes into concrete approvals, even in seemingly hopeless situations.
Based in Illinois, the firm is led by Murtaz Navsariwala, an attorney and member of the American Immigration Lawyers Association (AILA) and the American Bar Association.
Holding degrees in Economics and History from Northwestern University and a Juris Doctor of Laws from Indiana University Bloomington Maurer School of Law, Murtaz built his reputation primarily through success in EB2-NIW cases, becoming a benchmark for qualified professionals seeking to obtain a Green Card and build a solid career in the United States.
At Murtaz Law, no case is treated as just another number. Each case is carefully analyzed, considering the history, objectives, and particularities of each client. The firm operates in various areas of U.S. immigration, including work visas, family law cases, naturalization, regularization of status, and permanent immigration strategies, always seeking the safest and most strategic path for each situation.
Currently, Murtaz Law maintains an approval rate of approximately 99.5% in its cases, a result of a combination of legal experience, detailed preparation, and a deep understanding of the requirements of the U.S. immigration system.
A consultation can be scheduled. Because the future you envision may be much closer than your lack of knowledge has led you to believe.
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