A Social Security Number is a nine-digit identifier the federal government issues to track your work history, taxes, and benefits

Your Social Security Number (SSN) is issued by the Social Security Administration, a federal agency. The number itself has no meaning — it is not coded with your birth date, state, or any other personal information, despite what many people believe. The SSA assigns numbers in a roughly sequential way, but the digits do not tell a story about who you are.

You need an SSN to work legally in the United States, to file taxes, to open a bank account, and to receive Social Security benefits when you retire or become disabled. Landlords, employers, and lenders use it to verify your identity and check your credit history. Without one, you cannot hold most jobs or access most government programs.

Key Takeaways

  • A Social Security Number is a nine-digit number issued by the Social Security Administration to U.S. citizens, permanent residents, and certain work-authorized immigrants.
  • You need an SSN to work legally, file taxes, open bank accounts, and receive Social Security retirement or disability benefits.
  • You can request an SSN at a Social Security office by showing proof of citizenship or immigration status, proof of age, and proof of identity.
  • The SSN itself does not contain coded information about your birth date or state — it is simply a sequential identifier.
  • If you lose your Social Security card, you can request a replacement at your local Social Security office or online through ssa.gov.

Who Gets a Social Security Number

The Social Security Administration issues SSNs to U.S. citizens, lawful permanent residents (green card holders), and certain immigrants with work authorization. You can request one at any age — newborns can receive one, and adults can request one when they first become authorized to work or live in the United States.

If you are not a U.S. citizen or permanent resident, you may still be able to get an SSN if you have a visa that allows you to work, such as an H-1B, L-1, or O-1 visa. Undocumented immigrants cannot get an SSN, though some states issue Individual Taxpayer Identification Numbers (ITINs) instead, which allow you to file taxes and open some bank accounts.

How to Get a Social Security Number

To request an SSN, visit your local Social Security office in person. You will need to bring three types of documents: proof of citizenship or immigration status (a birth certificate, passport, or green card), proof of age (a birth certificate or passport), and proof of identity (a driver's license, passport, or state ID). If you do not have a driver's license or state ID, bring a school ID, employee ID, or medical record with your name and photo.

The process takes about 15 minutes. The SSA will take your documents, verify them, and issue you a Social Security card on the spot or mail it to you within two weeks. There is no fee. If you are applying for your child, bring the child's birth certificate and your own ID. If you are applying as an immigrant, bring your immigration documents and passport.

You can also request an SSN by mail if you cannot visit an office. Download Form SS-5 from ssa.gov, gather the same documents, and mail them to your local Social Security office. Processing by mail takes four to six weeks.

What Your Social Security Number Is Used For

Employers use your SSN to report your wages to the IRS and to the Social Security Administration. This creates a work history that determines how much you can receive in Social Security retirement benefits later. Your SSN is also your tax identification number — you must provide it when you file income taxes.

Banks and credit card companies use your SSN to check your credit history and decide whether to lend you money. Landlords use it to run background checks. Government agencies use it to administer benefits programs like Social Security Disability Insurance, Supplemental Security Income, Medicare, and Medicaid. Schools and student loan servicers use it to track education records and loans.

You should not give your SSN to anyone who does not have a legitimate reason to ask for it. Scammers often call or email claiming to be from Social Security or the IRS and demand your number. The real Social Security Administration will not call you unexpectedly or threaten you with arrest.

Replacing a Lost or Stolen Social Security Card

If your Social Security card is lost, stolen, or damaged, you can request a replacement at your local Social Security office. Bring your ID and proof of citizenship or immigration status — the same documents you brought when you first got your number. There is no fee for a replacement card.

You can also request a replacement online at ssa.gov if you have a my Social Security account and meet certain requirements: you must be at least 18 years old, have a U.S. mailing address, and have a valid driver's license or state ID. Online requests are processed faster than in-person requests — your card will arrive within one to two weeks instead of two to four weeks.

Social Security Number and Identity Theft

Your Social Security Number is sensitive information. If someone obtains it, they can open credit accounts in your name, take out loans, or file false tax returns. This is called identity theft. To protect your SSN, do not carry your Social Security card in your wallet unless you need it that day. Do not give it out over the phone unless you initiated the call and know the organization is legitimate.

If you believe your SSN has been stolen, contact the Social Security Administration at 1-800-772-1213 or visit ssa.gov. You can also place a fraud alert with the three major credit bureaus (Equifax, Experian, and TransUnion) to prevent someone from opening accounts in your name. The fraud alert is free and lasts one year.

Frequently Asked Questions

Does my Social Security Number contain my birth date or state?

No. The nine digits are assigned sequentially by the Social Security Administration and do not encode personal information. The first three digits used to indicate the state where you applied, but the SSA stopped using that system in 2011 and now assigns numbers randomly.

Can I change my Social Security Number?

Yes, but only in limited situations. You can request a new number if you are a victim of identity theft or domestic violence, or if you have religious or cultural objections to your current number. You must visit a Social Security office in person and provide documentation of your reason. A name change alone does not require a new number.

What is an ITIN and how is it different from an SSN?

An Individual Taxpayer Identification Number (ITIN) is a nine-digit number issued by the IRS to people who are not may be able to access for an SSN but need to file taxes or open a bank account. ITINs are available to undocumented immigrants and certain visa holders. An ITIN cannot be used to work legally or to receive Social Security benefits.

Do I need to carry my Social Security card with me?

No. You only need your card when you are applying for a job, opening a bank account, or signing up for government benefits. Most of the time, you can simply provide your number verbally or in writing. Carrying your card increases the risk of theft or loss.

What should I do if someone calls claiming to be from Social Security?

Hang up. The real Social Security Administration does not call people unexpectedly or threaten arrest. If you think there is a legitimate issue with your account, call the SSA directly at 1-800-772-1213 using the number on the official ssa.gov website, not a number from the caller.