What a disposable credit card number is
A disposable credit card number is a temporary card number generated by your bank or credit card issuer that links to your real account but works only once or for a limited time. When you use it to make a purchase online, the merchant never sees your actual card number. If that temporary number is stolen or the merchant is breached, a thief cannot use it again or access your real account.
The number typically expires after one transaction, after a set date you choose, or after a certain dollar amount is spent. Some issuers call these virtual card numbers, single-use numbers, or masked numbers. The mechanics vary by bank, but the result is the same: your real card stays hidden.
Key Takeaways
- Disposable numbers are generated through your bank's app or website and expire after one use or on a date you set, leaving your real card number protected.
- Not all banks offer this feature — check your card issuer's app or call customer service to see if your account supports it.
- These numbers work best for one-time purchases, subscriptions you plan to cancel, or shopping at retailers you do not fully trust.
- A disposable number does not hide your billing address or personal information from the merchant, only your actual card number.
- If a charge appears on your real account tied to a disposable number, you can dispute it the same way you would any other unauthorized charge.
Which banks and card issuers offer disposable numbers
Major issuers that currently offer this feature include Citi (through Citi Virtual Account Numbers), Bank of America (through ShopSafe, though this program is being phased out), and Capital One (through Eno, their virtual card assistant). American Express offers a similar service through their app. Discover and several smaller banks have versions as well.
The availability and name of the feature change over time. The fastest way to know if your card supports it is to open your bank's mobile app and look for a menu item labeled "Virtual Card," "Card Controls," "Disposable Numbers," or "Masked Numbers." If you do not see it, call the customer service number on the back of your card and ask whether your account type includes virtual card numbers.
How to generate a disposable number
The process differs slightly by issuer, but the basic steps are the same. Open your bank's mobile app or log into your online account. Look for a section labeled "Card Controls," "Virtual Cards," or "Account Services." Select the option to generate a new virtual number.
You will typically be asked to set a few details: the merchant name (optional but helpful for your own records), an expiration date or transaction limit, and sometimes a spending cap. The app then displays a temporary card number, expiration date, and CVV. Write these down or take a screenshot, because you will need them to complete your purchase. Some apps let you copy the number directly to your clipboard.
Once you have the temporary number, use it exactly as you would a real card number at checkout — online, by phone, or through a merchant's app. The charge will appear on your regular statement under your real account, but the merchant's system will only record the temporary number.
When disposable numbers actually protect you
Disposable numbers work best when you are buying from a merchant you do not know well, making a one-time purchase you will never repeat, or signing up for a subscription you plan to cancel. If the retailer's website is breached or the number is intercepted during transmission, the thief gets a number that either has already expired or will not work a second time.
They are less useful for recurring charges you plan to keep — subscriptions, insurance payments, or regular bills. You would need to generate a new number each month, which defeats the convenience. For those, your real card number with fraud monitoring is often simpler.
Disposable numbers also do not hide your name, billing address, or email from the merchant. A thief who steals your temporary number still cannot use it, but the merchant knows who you are. If you are concerned about a company selling your personal data, a disposable number does not solve that problem.
What happens if fraud occurs with a disposable number
If you notice a charge on your statement that you did not authorize — even one tied to a disposable number — contact your card issuer when ready. The process is the same as disputing any other fraudulent charge. Your bank will investigate and, if the charge is confirmed as unauthorized, will reverse it and issue you a new card if necessary.
Because the disposable number is linked to your real account, the charge appears on your regular statement. Your issuer can see which temporary number was used and when it was generated. This actually makes disputes easier to document, because you can show your bank exactly when you created that number and for what purpose.
Keep records of which merchants you gave each disposable number to. If a number is misused, you can tell your bank which retailer had it, which helps them investigate faster.
Disposable numbers versus other fraud protection methods
Disposable numbers are one layer of protection, but they work alongside other tools. Most credit cards already include fraud monitoring — your issuer watches for unusual activity and may block suspicious charges before they go through. Disposable numbers add a second layer by ensuring the merchant never has your real number in the first place.
Some people use a separate credit card with a low limit for risky purchases instead of generating a disposable number. That works, but it requires managing multiple accounts. A disposable number is faster and does not clutter your wallet.
Others rely on their card issuer's fraud may provide alone, which covers most unauthorized charges. That is legitimate protection, but it requires you to notice the fraud and dispute it. A disposable number prevents the problem before it starts.
Limitations and things to know
Disposable numbers do not work everywhere. Some merchants' payment systems cannot process virtual card numbers, particularly older retailers or those using outdated checkout software. If a number is rejected, you may have to use your real card or try a different retailer.
Some subscription services and merchants track card numbers to prevent duplicate charges or enforce their terms. A disposable number may trigger a decline if the system expects the same number for a renewal. Always check the merchant's policy before using a temporary number for anything you plan to renew.
Disposable numbers also do not protect you from scams where you willingly send money to a fraudster. If someone tricks you into paying them, the temporary number does not matter — the money is gone. These numbers protect against theft and data breaches, not against social engineering.
Frequently Asked Questions
Can I use a disposable number for in-store purchases?
Most disposable numbers work only for online and phone purchases because they are designed for card-not-present transactions. In-store, you need a physical card. Some banks are testing mobile wallet versions that work in stores, but this is not yet standard.
What if I forget which merchant I gave a disposable number to?
Check your bank's app or online account. Most issuers keep a log of every virtual number you generated, including the merchant name you entered and the date. If you did not enter a merchant name, the charge on your statement will show the retailer's name, so you can match it that way.
Do disposable numbers cost extra?
No. Virtual card numbers are a free feature included with most credit cards that offer them. There is no fee to generate one, and you pay the same interest and rewards as you would with your real card number.
Can I cancel a disposable number before it expires?
Yes. Most apps let you manually expire a virtual number at any time. This is useful if you change your mind about a purchase or want to revoke access to a merchant when ready.
Will using a disposable number affect my credit score?
No. The charge is recorded on your real account, so it counts toward your credit utilization and payment history exactly as it would with your real card number. The temporary number is invisible to credit bureaus.