What a Social Security lock does and how to set one up

A Social Security number lock is a free service that stops anyone — including you — from using your Social Security number to open new credit accounts. When your number is locked, credit bureaus will not issue a credit report to lenders, which means someone who steals your number cannot get a loan, credit card, or phone plan in your name.

You set up a lock directly with the three major credit bureaus: Equifax, Experian, and TransUnion. Each one maintains its own lock independently, so you must contact all three. The lock takes effect within one business day and stays in place until you remove it yourself. There is no cost, no application, and no government involvement — the bureaus run this system on their own.

A lock is different from a credit freeze, which is also free but requires a PIN and takes longer to remove. Most people use a lock if they want something quick and reversible, or a freeze if they want stronger protection and do not plan to open new credit soon.

Key Takeaways

  • You must contact Equifax, Experian, and TransUnion separately — locking with one bureau does not lock your number with the others.
  • Each bureau has its own website and phone number where you can set up a lock in minutes without a PIN or password.
  • A lock takes effect within one business day and stops new credit accounts from being opened in your name.
  • You can remove a lock anytime you need to open a legitimate credit account, and it takes effect the same day.

How to lock your number with each bureau

Start with Equifax at equifax.com/personal/credit-lock. You will need your Social Security number, date of birth, and a valid email address or phone number. Equifax will send you a confirmation code to that email or phone, which you enter to complete the lock. The whole process takes about five minutes.

Next, go to Experian at experian.com/security/credit-lock. Enter your Social Security number, date of birth, and a phone number or email. Experian will text or email a code, which you enter to activate the lock. This also takes roughly five minutes.

Finally, visit TransUnion at transunion.com/credit-lock. Provide your Social Security number, date of birth, and contact information. TransUnion will send a code to confirm. Once you enter it, your lock is active.

Write down the date you locked each bureau and save any confirmation emails or screenshots. You will need proof that your number was locked if fraud does occur, because it shows you took reasonable steps to protect yourself.

What happens when your number is locked

When a lender tries to pull your credit report to approve a loan, credit card, or phone plan, the bureau will refuse to send it. The lender will deny the application without even looking at your credit score. This stops most identity theft cold, because criminals need a credit report to open accounts.

Your own credit inquiries and existing accounts are not affected. You can still check your own credit report, pay bills, or use credit cards you already own. The lock only blocks new credit from being opened.

If you try to open a legitimate account — a mortgage, car loan, or credit card — and the lender cannot get your report, they will deny you. That is why you need to remove the lock before you apply for new credit. Most bureaus let you remove a lock the same day through their website.

Removing a lock when you need new credit

If you are about to apply for a mortgage, car loan, credit card, or apartment, you will need to remove your lock first. Log into each bureau's website, find the lock section, and select "remove lock" or "unlock." Most bureaus process this the same business day, though some may take up to 24 hours.

Remove the lock a few days before you apply, to give the bureaus time to process. Once you have opened the account you wanted, you can lock your number again immediately. You can lock and unlock as many times as you want at no cost.

Some people keep their number locked year-round and only unlock it when they are actively shopping for credit. Others unlock it for a few months if they know they will be applying for multiple things — a car and a home, for example — and then lock it again.

Lock versus freeze: which one to choose

A credit freeze is similar to a lock but stronger and more permanent. With a freeze, you receive a PIN that you must provide every time you want to unlock your number. Freezes take longer to remove — usually three business days — and some lenders may not honor them.

Use a lock if you want something you can turn on and off easily, or if you plan to open new credit within the next year. Use a freeze if you do not plan to open new credit for a long time and want the strongest possible protection. You can have both a lock and a freeze active at the same time, though that is rarely necessary.

Both are free. Neither affects your credit score or existing accounts. The main trade-off is convenience: a lock is faster to remove, a freeze is harder to bypass.

What a lock does not protect against

A lock stops someone from opening new credit in your name, but it does not stop them from using your number for other fraud. They could still file a fake tax return, open a bank account, get a job using your number, or commit crimes in your name. A lock is one layer of protection, not a complete shield.

If your number has already been used for fraud, a lock will prevent future fraud but will not undo the damage already done. You would need to file a report with the Federal Trade Commission and contact the companies involved to dispute the fraudulent accounts.

A lock also does not protect you if someone you know — a family member, roommate, or employee — commits fraud using your number. The lock stops strangers, not people who already have your trust and access to your information.

Frequently Asked Questions

Do I need to lock my number with all three bureaus?

Yes. Each bureau operates independently, and lenders can pull reports from any of them. If you lock only Equifax, a criminal can still open accounts using reports from Experian or TransUnion. You must contact all three to be fully protected.

Can I lock my child's Social Security number?

Yes, but the process is different. You will need to contact each bureau and provide proof that you are the parent or legal guardian. Some bureaus require a copy of the child's birth certificate and your ID. Call each bureau directly for their specific requirements for minors.

What if I forget to unlock before applying for credit?

The lender will tell you the application was denied because they could not pull your credit report. At that point, you can unlock your number and reapply. Most bureaus process unlocks the same day, so you may be able to reapply within 24 hours.

Does a lock cost anything?

No. Locking your number with all three bureaus is completely free. Do not pay anyone to lock your number for you — scammers sometimes charge fees for this service, but you can do it yourself at no cost.

Will a lock affect my credit score?

No. A lock does not change your credit score, show up on your credit report, or affect any existing accounts. It only prevents new credit from being opened.