What happens when someone steals your credit card number
A stolen credit card number is usually sold within hours. Thieves use it to make purchases online, test whether it still works, or sell it to someone else on the dark web. The card itself never leaves your wallet — the thief only needs the number, expiration date, and CVV code printed on the back. Most stolen numbers are used for small purchases first, to confirm the card is active before attempting larger charges.
The person who steals the number is rarely the person who uses it. Theft and fraud are separate steps in a chain. A data breach at a retailer might expose thousands of numbers at once. Those numbers are bundled and sold to resellers. Resellers sort them by card type and bank, then sell smaller batches to people who actually commit fraud. By the time someone charges $500 to your card, the original thief is already gone.
Your bank's fraud detection system catches most of this activity. Charges that don't match your normal spending pattern — a $2,000 purchase from another country, for example — trigger an automatic hold. The bank calls you to confirm. If you deny the charge, the bank reverses it and issues a new card. This is why you should report suspicious activity when ready rather than waiting to see if it resolves itself.
Key Takeaways
- Stolen card numbers are sold in batches on the dark web, often within hours of theft, and used for online purchases or resold multiple times before being used.
- Your bank's fraud detection catches most unauthorized charges, but you must report them within 60 days to avoid liability under federal law.
- Monitoring your statements monthly and setting up transaction alerts are the most effective ways to catch fraud early, before large charges accumulate.
- Freezing your credit with the three major bureaus prevents thieves from opening new accounts in your name, even if they have your card number.
- A stolen card number alone cannot be used to drain your bank account, but it can fund purchases and subscriptions that are harder to notice and reverse.
How thieves obtain card numbers in the first place
Card numbers come from four main sources: data breaches at retailers or payment processors, skimming devices placed on ATMs or gas pumps, phishing emails that trick you into entering your number, and employees at restaurants or stores who photograph or write down your card during a transaction.
Data breaches are the largest source by volume. When a retailer's payment system is compromised, thousands or millions of card numbers are exposed at once. The retailer is usually required to notify you by mail or email within a certain timeframe, though the notification often arrives weeks after the breach occurred. By then, your number may already be in circulation.
Skimming devices are smaller in scale but harder to detect. A skimmer is a thin card reader placed over the real card slot on an ATM or gas pump. When you insert your card, the skimmer reads the magnetic stripe while the legitimate machine processes your transaction. You have no way to know it happened. Skimmers are most common at unmanned machines in remote locations, but they can appear anywhere.
Phishing and in-person theft are personal rather than mass attacks. A phishing email mimics your bank or a retailer and asks you to "verify" your card details by clicking a link. The link leads to a fake website that looks identical to the real one. Anything you enter goes directly to the attacker. In-person theft happens when a server or cashier uses a handheld device to copy your card information while processing a legitimate payment.
The difference between card fraud and identity theft
Card fraud and identity theft are related but separate crimes. Card fraud means someone uses your card number to make purchases. Identity theft means someone uses your personal information — name, Social Security number, date of birth — to open new accounts, take out loans, or commit other crimes in your name.
A stolen card number alone is not enough for identity theft. A thief can charge $5,000 to your card without knowing your Social Security number. But to open a credit card account, car loan, or mortgage in your name, they need more. They need your full name, address, date of birth, and Social Security number. A data breach that exposes only card numbers is card fraud risk. A breach that exposes names, addresses, and SSNs is identity theft risk.
This distinction matters because the steps you take to protect yourself are different. For card fraud, you monitor your statements and report unauthorized charges. For identity theft, you freeze your credit to prevent new accounts from being opened. You can do both at the same time, and you should if a breach exposed more than just your card number.
What to do when ready after discovering unauthorized charges
Call your card issuer's fraud line as soon as you notice a charge you did not make. The phone number is on the back of your card or on your monthly statement. Do not use a number from an email or text message, even if it looks official — call the number you already have on file. Tell the representative the specific charge, the date it posted, and the merchant name. Have your card in front of you.
The representative will ask whether you recognize the charge. Answer clearly: "No, I did not make this purchase." They will then ask a series of security questions to confirm your identity. Answer honestly. Once confirmed, they will reverse the charge and issue a new card with a new number. The new card usually arrives within 5 to 10 business days.
Federal law limits your liability for unauthorized charges. If you report the fraud within 60 days of the charge appearing on your statement, you are not responsible for the amount. If you wait longer than 60 days, you may be liable for up to $50 per card, though most banks waive this fee. If you wait more than 60 days and the thief has drained your account, you could lose the full amount. Report fraud as soon as you see it.
After reporting the charge, check your statement again in 3 to 5 business days to confirm the reversal posted. Sometimes the reversal takes longer than expected. If it does not appear, call the fraud line again and reference your previous report number. Keep a record of every call you make — the date, time, representative name, and what was discussed.
How to monitor your accounts and catch fraud early
The most effective defense is monthly statement review. Log into your credit card account online and scroll through every charge from the past month. Look for merchants you do not recognize, charges in amounts that seem wrong, or purchases from places you have never been. Spend five minutes on this. Most people who catch fraud early do so because they review their statements regularly.
Set up transaction alerts through your card issuer's app or website. Most banks allow you to set alerts for charges above a certain amount — say, $100 or $500 — or for any charge that posts while you are not using the card. When a charge triggers an alert, you get a text or email when ready. You can then confirm whether you made the purchase or report it as fraud within minutes, before the thief makes additional charges.
Check your credit report once per year through AnnualCreditReport.com, the official site run by the three major credit bureaus. Your credit report lists every account opened in your name — credit cards, loans, utilities, phone plans. If someone opened a credit card account using your information, it will appear here. You are may have access to to one free report per year from each bureau. Pull one report every four months to spread them out and catch fraud faster.
Consider placing a credit freeze with Equifax, Experian, and TransUnion. A freeze prevents anyone, including you, from opening new accounts in your name without unfreezing first. It does not affect your existing accounts or your credit score. If a thief has your Social Security number and tries to open a credit card, the process will be denied because the freeze blocks it. Freezing is free and takes about 15 minutes per bureau.
Steps to take if your card number is exposed in a data breach
When a retailer or payment processor suffers a data breach, they are required by law to notify affected customers. You will receive a letter or email with details about what information was exposed, when the breach was discovered, and what you should do. Read this notification carefully. It will tell you whether only your card number was exposed or whether your name, address, and other personal information was also compromised.
If the notification says only card numbers were exposed, monitor your statements closely for the next 12 months. Most fraudulent charges appear within the first 90 days, but some thieves hold onto stolen numbers and use them months later. Set up transaction alerts if you have not already. You do not need to freeze your credit unless the breach also exposed your Social Security number or other identity information.
If the notification says your name, address, Social Security number, or date of birth was exposed, freeze your credit when ready. Do this even if you do not see any fraudulent activity yet. A freeze is free and takes 15 minutes. You can unfreeze temporarily if you need to open a new account, then refreeze afterward. Many breaches include free credit monitoring for one or two years — the notification will tell you how to sign up. Use it, but do not rely on it alone.
Keep the breach notification letter or email. Save it in a folder on your computer and print a copy. If fraudulent charges appear later and you need to dispute them, you will have documentation that your information was compromised. This makes the dispute process faster and strengthens your case if the bank initially questions whether the charges were really unauthorized.
How to reduce your risk of card number theft
Use chip readers instead of swiping whenever possible. Chip technology encrypts your card data in a way that magnetic stripe swiping does not. A skimmer can still read a magnetic stripe, but it cannot read a chip. If a merchant's terminal does not have a chip reader, ask whether they have one available. Most do.
Avoid entering your card number on public Wi-Fi networks. If you are at a coffee shop or airport and need to make a purchase online, use your phone's cellular data instead of the Wi-Fi. Cellular data is encrypted end-to-end. Public Wi-Fi is not. A skilled attacker on the same network can intercept unencrypted data, including card numbers you type into a website.
Do not store your full card number anywhere — not in your phone, not in an email, not in a note app. If you need to remember your card number, memorize the last four digits only. Merchants only need the last four digits to identify your card anyway. If your phone is stolen, a thief will not find your card number.
Use a credit card instead of a debit card for online purchases and travel. Credit cards have stronger fraud protections than debit cards. With a credit card, unauthorized charges are reversed and you owe nothing. With a debit card, the money comes directly from your bank account. Even though you can dispute the charge, your money is gone until the dispute is resolved, which can take weeks. Keep your debit card for ATM withdrawals only.
Frequently Asked Questions
Can someone drain my bank account with just my credit card number?
No. A credit card number alone cannot access your bank account. A thief can use your card number to make purchases or open new accounts, but they cannot transfer money from your checking account. If your debit card number is stolen, the risk is higher because a debit card is linked directly to your bank account. This is another reason to use credit cards for purchases instead of debit cards.
How long does it take for a stolen card number to be used?
Most stolen numbers are used within 24 to 48 hours of theft. Thieves test the card with small purchases first to confirm it is active before attempting larger charges. Some numbers sit unused for weeks or months if they are sold to someone who does not use them when ready. This is why monitoring your statements for a full year after a breach is important.
Will my credit score be affected if my card is stolen?
Fraudulent charges on your existing card do not affect your credit score because you are not responsible for them once you report them. However, if a thief opens new accounts in your name using your identity information, those accounts will appear on your credit report and lower your score. This is why freezing your credit is important if your Social Security number was exposed.
What should I do if I gave my card number to a phishing website?
Call your card issuer when ready and report the incident. They will cancel your card and issue a new one. Tell them the website you entered your information into and when it happened. The bank will flag your account for fraud monitoring. Change any passwords you may have entered on that website, especially if you used the same password on other accounts. Consider freezing your credit if you also entered your Social Security number.
Do I need to pay for credit monitoring after a data breach?
No. Most data breaches include free credit monitoring for one or two years as part of the settlement. You should use it, but it is not a substitute for freezing your credit or monitoring your statements yourself. Free monitoring alerts you if someone tries to open an account in your name, but it does not prevent them from trying. A credit freeze prevents the attempt from succeeding in the first place.