Your Social Security number is a nine-digit identifier the government uses to track your earnings, benefits, and tax records

A Social Security number (SSN) is issued by the Social Security Administration and stays with you for life. It appears on your Social Security card and serves as the main way the government links your work history, tax payments, and any benefits you receive to your identity. Without one, you cannot work legally in the United States, open a bank account, get a mortgage, or receive Social Security retirement or disability payments.

The number itself has no hidden meaning — it is not coded by state or birth date, despite common myths. It is simply a nine-digit reference number assigned in sequence. The Social Security Administration issues roughly 450 million numbers and keeps records on all of them.

Key Takeaways

  • Your Social Security number is required to work legally, file taxes, and receive any Social Security benefit.
  • You can request a replacement card if yours is lost, stolen, or damaged by visiting your local Social Security office or applying online.
  • Protecting your number from theft is critical because it can be used to open accounts, take out loans, or file false tax returns in your name.
  • Children need a Social Security number to be claimed as dependents on tax returns, but parents can delay requesting one until after birth.
  • If you believe your number has been misused, contact the Social Security Administration and the Federal Trade Commission immediately.

When you get a Social Security number and how to request one

U.S. citizens and permanent residents can request a Social Security number at birth or at any time afterward. Parents typically apply for their newborn's number at the hospital before leaving, though they can also apply later through the Social Security Administration. You will need a birth certificate, proof of citizenship or immigration status, and a photo ID if you are applying as an adult.

To request a number, visit your local Social Security office in person, call 1-800-772-1213, or go to ssa.gov to see if you can apply online. Processing usually takes one to two weeks. The Social Security Administration will mail your card to the address you provide.

Getting a replacement card if yours is lost or damaged

If your card is lost, stolen, or too worn to read, you can request a replacement. You are allowed up to three replacement cards per year and ten in your lifetime. Visit your local Social Security office with a photo ID and proof of citizenship, or apply online at ssa.gov if you have a my Social Security account.

Online replacement is faster — you can request a card and it will be mailed within one to two weeks. If you apply in person, bring the same documents you would need for an initial application. There is no fee for a replacement card.

Why protecting your Social Security number matters

Your Social Security number is the key to your financial identity. Someone with your number can open credit cards, take out loans, file a tax return, or claim benefits in your name. This type of identity theft can take months or years to untangle and can damage your credit score, cost you money, and create legal complications.

Do not carry your Social Security card in your wallet. Memorize your number instead. Be cautious about who you give it to — your doctor's office, employer, and bank need it, but many other organizations do not. Ask before you provide it. Shred documents with your number on them, monitor your credit report for accounts you did not open, and check your Social Security earnings record annually to make sure the income listed is correct.

What to do if your Social Security number has been misused

If you suspect your number has been stolen or used fraudulently, contact the Social Security Administration at 1-800-772-1213 and report the misuse. They can flag your account and help you understand what happened. You should also file a report with the Federal Trade Commission at identitytheft.gov, which creates an official record and can help you dispute fraudulent accounts.

Contact your bank and credit card companies to report any accounts you did not open. Place a fraud alert on your credit report by calling one of the three major credit bureaus (Equifax, Experian, or TransUnion) — they will notify the others. You may also want to freeze your credit to prevent new accounts from being opened without your permission.

Social Security numbers for children and dependents

You need your child's Social Security number to claim them as a dependent on your tax return. Most parents request a number at birth, but you can apply for one later. If you adopt a child, you can request a number as part of the adoption process or afterward through the Social Security Administration.

Some parents delay requesting a number for privacy reasons, but this means you cannot claim the child on your taxes until you do. There is no age limit — you can request a number for a child at any time. Bring a birth certificate, proof of citizenship, and your own ID to your local Social Security office.

Understanding your Social Security earnings record

The Social Security Administration maintains a record of all wages you have earned and taxes you have paid throughout your working life. This record determines how much you will receive in retirement or disability benefits. You can view your earnings record by creating a my Social Security account at ssa.gov and logging in.

Check your record annually to make sure your employer reported your income correctly. If you spot an error — a missing year, an incorrect amount, or income you did not earn — contact the Social Security Administration with your tax return or W-2 as proof. Correcting errors early prevents problems when you file for benefits later.

Frequently Asked Questions

Can I change my Social Security number?

Yes, but only in limited situations. The Social Security Administration will issue a new number if you can show you are being harassed or stalked, if you are a victim of identity theft or fraud, or if your religious beliefs conflict with having a number. You must apply in person at your local Social Security office with documentation of your reason.

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

No. Your employer, bank, and doctor have your number on file. Carrying the card increases the risk of theft. Memorize your number instead and leave the card at home in a safe place.

What happens if I lose my Social Security number and cannot remember it?

Contact the Social Security Administration at 1-800-772-1213 or visit your local office with a photo ID and proof of citizenship. They can look up your number and send you a replacement card. You can also view your number through a my Social Security account if you have one set up.

Can someone use my Social Security number if they only know the number, not my name?

Yes. A Social Security number alone is enough to open accounts, apply for credit, or file a tax return. This is why protecting your number is so important. If your number is exposed in a data breach, monitor your credit and consider placing a fraud alert or credit freeze.