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What a Social Security Number Is and Why You Might Need One

A Social Security Number (SSN) is a nine-digit identifier issued by the Social Security Administration (SSA), a federal agency. The number looks like this: XXX-XX-XXXX. Originally created in 1936 to track earnings for Social Security benefits, the SSN has become a key piece of identification used across many areas of American life.

Today, you may need an SSN for several reasons. Employers use SSNs to report your wages to the government and to the Internal Revenue Service (IRS). Banks and financial institutions request SSNs when you open accounts, apply for loans, or use credit services. Schools sometimes use SSNs for student records. Healthcare providers may ask for an SSN to bill insurance. Some government programs use SSNs to verify identity and prevent fraud.

The Social Security Administration issues SSNs to U.S. citizens, lawful permanent residents, and certain non-citizens with work authorization. As of 2023, more than 450 million SSNs have been issued since the program began. Not everyone needs an SSN—for example, some non-working family members or visitors may not require one. However, if you plan to work in the United States, open a bank account, or file taxes, obtaining an SSN is typically necessary.

The SSN itself does not provide benefits or access to programs. Instead, it serves as a reference number that connects you to government records, employment records, and financial records. Understanding what an SSN is and its purpose helps you recognize why various organizations request it and what to expect during the process of obtaining one.

Practical Takeaway: An SSN is a nine-digit number used to identify you in work, tax, banking, and government records. If you work or use financial services in the U.S., you will likely need an SSN.

Who Can Get a Social Security Number

The Social Security Administration has clear rules about who may receive an SSN. U.S. citizens are always eligible to obtain an SSN. This includes people born in the United States and U.S. citizens born abroad to American parents. Lawful permanent residents—often called green card holders—may also obtain an SSN. Non-citizens with temporary work authorization, such as those with an H-1B visa or an employment authorization document (EAD), may obtain an SSN if they have work permission.

Certain non-citizens without work authorization may still obtain an SSN under limited circumstances. For example, individuals with Temporary Protected Status (TPS) or those with pending asylum cases sometimes qualify. Children born to non-citizen parents in the United States are U.S. citizens and may obtain an SSN.

Age requirements are minimal. Parents may request an SSN for newborns immediately after birth at the hospital, or later through the Social Security Administration. Children do not need to reach any particular age to receive an SSN. Adults may request an SSN at any time during their lives.

Some people may not be issued an SSN. Non-citizens without work authorization or valid visa status typically do not receive one. Temporary visitors (such as tourists) do not receive SSNs. However, some visitors may obtain an Individual Taxpayer Identification Number (ITIN) from the IRS instead, which serves a similar purpose for tax filing but does not provide access to Social Security benefits.

The rules change periodically, and individual circumstances vary. If you are uncertain whether you may receive an SSN based on your immigration status or life situation, the Social Security Administration provides detailed information on its official website and at local Social Security offices.

Practical Takeaway: U.S. citizens and lawful permanent residents may receive an SSN. Some non-citizens with work permission or special visa status may also receive one. Check the SSA website if you are unsure about your circumstances.

How to Request a Social Security Number

Requesting an SSN involves submitting documents to the Social Security Administration to verify your identity, age, citizenship or immigration status, and work authorization if applicable. The process differs slightly depending on whether you are requesting one for yourself as an adult, for a child, or as a non-citizen.

For newborns, many hospitals offer to submit SSN requests directly. Parents can indicate on birth registration forms that they want an SSN issued. The hospital forwards the information to the SSA, and the number arrives by mail within two to four weeks. This is the easiest method because parents do not need to visit an office. Alternatively, parents may wait and request an SSN at any time later.

For children and adults not born in the U.S., you will need to visit a Social Security office in person. Bring original documents that prove your identity (such as a passport or driver's license), proof of age (such as a birth certificate), proof of citizenship or immigration status (such as a green card, visa, or naturalization papers), and proof of your work authorization if applicable (such as an employment authorization document). The SSA may also request a U.S. address or proof of residence.

The process involves filling out Form SS-5, Application for a Social Security Card. You do not need to fill it out beforehand—Social Security office staff can help you complete it on site. Most offices accept walk-ins, though some allow you to schedule appointments online or by phone. Processing typically takes one to three weeks. The Social Security card arrives by mail.

There is no cost to request an SSN. The Social Security Administration does not charge fees for this service. Be cautious of third-party websites or services that claim to charge money to request an SSN—this is unnecessary and may be fraudulent.

Practical Takeaway: To request an SSN, bring proof of identity, age, and citizenship or immigration status to a Social Security office. The service is free, and the process takes one to three weeks.

Documents You Need to Provide

The Social Security Administration requires specific original documents (not photocopies) to verify your identity and status before issuing an SSN. The exact documents needed depend on your situation, but several categories of documents are commonly required.

For proof of identity, acceptable documents include a valid passport, a state-issued driver's license, a state identification card, a military ID, or a foreign national ID. Some documents must be current (not expired), while others may be expired in limited circumstances. If you do not have any of these, the SSA may accept other documents such as a school ID, library card, or work ID, though these are less preferred and you may need multiple forms of identification.

For proof of U.S. citizenship, bring an original birth certificate, a U.S. passport, a certificate of citizenship, a certificate of naturalization, or a consular report of birth abroad. For proof of lawful permanent resident status, bring your green card (Permanent Resident Card). For proof of non-citizen work authorization, bring your Employment Authorization Document (EAD), your visa, your I-94 arrival record, or your work permit.

For proof of age, bring an original birth certificate, passport, or other government-issued document showing your date of birth. The document must be certified or an official copy—not a photocopy.

For proof of residence or a U.S. address, the SSA may ask for a utility bill, lease agreement, mortgage statement, government correspondence, or bank statement showing your current address. Some offices have moved away from requiring proof of residence, so ask when you visit.

Foreign documents must be originals or certified copies. If a document is not in English, bring both the original and a certified English translation. The SSA does not accept notarized translations—they must be official certified translations.

Practical Takeaway: Gather your original passport or ID, birth certificate, and proof of citizenship or visa status before visiting a Social Security office. Bring proof of your current U.S. address if requested.

What Happens After You Submit Your Request

Once you submit your SSN request at a Social Security office, the agency verifies your information and begins processing your application. This verification process typically takes one to three weeks, though it may take longer in some cases. During this time, the SSA checks your identity documents against government records, confirms your citizenship or immigration status, and verifies that you are not already assigned an SSN.

If your documents are in order and the verification is successful, the Social Security Administration creates your record