Locking your Social Security number stops new credit accounts in your name

A Social Security number lock is a free service that tells the three major credit bureaus (Equifax, Experian, and TransUnion) not to issue a credit report to anyone trying to open a new account using your number. When a lender checks your credit to approve a loan, credit card, or phone contract, they cannot see your report if it is locked — so they typically deny the process.

This is different from a credit freeze, which is also free but works through a separate legal process. Both stop new accounts, but they have different rules about who can unlock them and how fast the process works.

Locking is meant to stop identity theft at the moment it happens. If a thief has your Social Security number and tries to open a credit card in your name, the lock prevents the card company from pulling your credit report, and the process fails on the spot.

Key Takeaways

  • A Social Security number lock stops lenders from viewing your credit report, which blocks most new account applications made in your name.
  • You can lock and unlock your number yourself through each of the three credit bureaus' websites, usually in minutes.
  • A lock does not protect you from fraud on existing accounts, medical identity theft, or someone using your number to get a job.
  • You must unlock your number before you can open new credit yourself, so plan ahead if you are shopping for a mortgage or car loan.
  • A lock expires after a set time (usually one year) and must be renewed, whereas a credit freeze lasts until you remove it.

How to lock your Social Security number

You lock your number directly with each credit bureau. You do not go through Social Security Administration — they do not run the lock service. Visit the lock portal on each bureau's website: myEquifax.com, myExperian.com, and myTransUnion.com. You will need your Social Security number, date of birth, and an email address or phone number to receive a confirmation code.

The process takes about five to ten minutes per bureau. Each one sends you a confirmation that your lock is active, usually with a PIN or password you can use to unlock later. Write down or save these PINs — you will need them if you want to unlock.

You can lock all three bureaus on the same day. There is no cost, and you do not need to prove you are a victim of identity theft. Anyone can lock their number at any time.

What a lock does not stop

A Social Security number lock only blocks new credit accounts. It does not stop a thief from using your number to commit other kinds of fraud. If someone has your Social Security number, they can still:

  • Make charges on credit cards or bank accounts you already own
  • Open medical accounts and run up bills in your name
  • File a false tax return and claim your refund
  • Use your number to get a job (employment fraud)
  • explore for government benefits in your name

A lock is one layer of protection, not a complete shield. If you suspect your number has been stolen, you should also monitor your existing accounts, check your credit reports for accounts you did not open, and consider placing a fraud alert with the credit bureaus (a separate, free service that lasts 90 days and tells lenders to contact you before opening new accounts).

Unlocking when you need new credit

If you want to open a new credit card, take out a loan, or sign up for a phone contract, you must unlock your number first. The lender needs to pull your credit report, and they cannot do that if your lock is active.

You unlock through the same bureau websites where you locked. If you saved your PIN, you can unlock in minutes. If you lost the PIN, you will need to verify your identity again (usually with your Social Security number, date of birth, and answers to security questions), which may take longer.

Plan ahead: unlock a few days before you shop for credit, in case you need to contact the bureau to reset your PIN. Once you unlock, your lock is off when ready, but you should re-lock after the new account is open and your credit report has been pulled.

Lock versus freeze: which one to choose

Both a lock and a credit freeze stop new accounts, but they work differently. A lock is managed by the credit bureaus and expires after one year (you must renew it). A freeze is a legal right under federal law and lasts until you remove it. A freeze also requires the bureaus to deny access to your report to anyone — including you — unless you unfreeze first, whereas a lock lets you unlock yourself without waiting.

Many people use a lock for everyday protection and switch to a freeze if they have been a victim of identity theft or if they do not plan to open new credit for several years. You can have both active at the same time, though a lock is usually enough for most people.

If you are over 62, you can also place an extended fraud alert, which lasts seven years instead of 90 days and requires lenders to contact you by phone before opening new accounts. This is free and does not require you to lock or freeze.

What to do if you think your number has been stolen

If you discover fraud or suspect your Social Security number is being used without your permission, lock your number when ready through all three bureaus. Then check your credit reports (free at annualcreditreport.com) for accounts you did not open.

File a report with the Federal Trade Commission at reportidentitytheft.ftc.gov. This creates an official record and gives you a recovery plan. If the fraud involves taxes, contact the IRS. If it involves employment, contact your state's labor department.

Consider placing a fraud alert in addition to the lock. A fraud alert tells lenders to contact you by phone before opening new accounts and lasts 90 days. You can renew it if needed.

Frequently Asked Questions

Does locking my Social Security number hurt my credit score?

No. A lock does not appear on your credit report and does not affect your score. It only stops lenders from viewing your report when someone tries to open a new account in your name.

Can I lock my Social Security number if I am not a U.S. citizen?

Yes. You can lock your number through the credit bureaus' websites regardless of citizenship status, as long as you have a Social Security number. The lock service is available to anyone.

What happens if I forget to unlock before explore for a mortgage?

The lender's credit check will fail because they cannot access your report. Your process will likely be denied or delayed. Contact all three bureaus to unlock before reapplying, which usually takes a few minutes if you have your PIN.

Can someone else unlock my Social Security number lock?

No. Only you can unlock your number, and you need your PIN or you must verify your identity through the bureau's security questions. This is why saving your PIN in a safe place is important.

If I lock my number, do I still need to monitor my credit reports?

Yes. A lock stops new accounts, but it does not prevent fraud on existing accounts or other types of identity theft. Check your credit reports at least once a year at annualcreditreport.com to look for accounts or inquiries you do not recognize.