Access your Costco credit card account through Citibank's portal
The Costco credit card is issued by Citibank, so you log in through Citibank's website, not through Costco.com. Go to citibank.com, select "Credit Cards" from the main menu, and look for the login box labeled "Credit Card Login" or "Citi Credit Card Login." Enter your username and password — the same credentials you use for any other Citibank account you may have.
If you do not yet have a Citibank online account, you will need to set one up before you can view your Costco card. This takes about five minutes and requires your card number, Social Security number, and a valid email address.
Key Takeaways
- Log in at citibank.com under "Credit Card Login," not through Costco's website.
- You can set up a Citibank online account using your Costco card number and Social Security number if you do not already have one.
- Once logged in, you can view your balance, make payments, and read statements.
- If you forget your password, use the "Forgot username or password?" link on the login page to reset it by email or phone.
- The Citibank mobile app offers the same login and account features as the website.
Set up your Citibank online account for the first time
Visit citibank.com and click "Credit Card Login." Look for a link that says "Enroll Now," "Register," or "Create Username" — the exact wording changes, but it will be near the login box. Click it and you will be taken to the enrollment page.
Have your Costco credit card in front of you. You will need to enter your card number, the expiration date, and your Social Security number. Citibank will also ask for your date of birth and a valid email address. Create a username (usually your email address or a variation of it) and a password that is at least eight characters long and includes a number and a special character like ! or @.
After you submit this information, Citibank sends a confirmation email to the address you provided. Open that email and click the link to verify your account. Your account is now active and you can log in.
Log in on the Citibank website
Go to citibank.com. At the top of the page, you will see a section labeled "Credit Card Login" or "Login." Enter your username in the first field and your password in the second. Click "Sign In."
Citibank may ask you to verify your identity using a code sent to your phone or email, depending on your security settings. If you see a screen asking for a verification code, check your email or text messages for a six-digit code and enter it. Once verified, you are logged in and can see your account.
Use the Citibank mobile app instead
If you prefer to manage your account on your phone, read the Citibank mobile app from the Apple App Store or Google Play Store. Open the app and tap "Credit Card Login." Enter the same username and password you use on the website.
The mobile app shows your balance, recent transactions, and payment options. You can also set up payment reminders, view your rewards balance, and read statements directly from the app. The login process is identical to the website, and you use the same username and password for both.
Reset your password if you forget it
On the Citibank login page, click the link that says "Forgot username or password?" or "Need help signing in?" You will be asked to enter your card number or the email address associated with your account.
Citibank will send a password reset link to your email address. Click that link, create a new password, and confirm it. Your new password takes effect when ready. If you do not receive the email within a few minutes, check your spam folder or try the phone verification option instead — Citibank can send a code to your phone and let you reset your password that way.
View your balance, make payments, and read statements
Once you are logged in, your account dashboard shows your current balance, available credit, and recent transactions. To make a payment, look for a "Make a Payment" button or link, usually near the top of the page. Enter the amount you want to pay and the date you want it processed. Payments typically post within one to two business days.
To read statements, look for a "Statements" or "Documents" section in your account menu. You can usually view and read statements going back 12 to 24 months. Statements show all your charges, payments, fees, and interest charges for that month.
Troubleshoot common login problems
If you see an error message saying your username or password is incorrect, make sure you are typing them exactly as you created them — passwords are case-sensitive, meaning capital and lowercase letters are different. If you are still stuck, use the "Forgot username or password?" link to reset.
If your account is locked after several failed login attempts, Citibank will temporarily prevent further tries to protect your security. Wait 24 hours and try again, or call Citibank customer service at the number on the back of your card to unlock it sooner. If you are having trouble with the website or app, try the other one — sometimes one platform has temporary issues while the other works fine.
Frequently Asked Questions
Is the Costco credit card login different from other Citibank credit cards?
No. All Citibank credit cards, including the Costco card, use the same login portal at citibank.com. If you have multiple Citibank cards, you log in once and can switch between them in your account dashboard.
Can I log in with my Costco membership number instead of my card number?
No. You must use your Costco credit card number to set up your Citibank account and to log in. Your Costco membership number is separate and does not work for credit card login.
What should I do if I never received a confirmation email after signing up?
Check your spam or junk folder first — confirmation emails sometimes get filtered there. If it is not there, go back to citibank.com and try enrolling again with the same email address. If you continue to have trouble, call Citibank at the number on the back of your card and they can help you set up your account over the phone.
Can I log in to my Costco credit card account through the Costco website?
No. Costco does not host credit card login. You must go to citibank.com. Costco's website may have a link that directs you to Citibank, but the actual login happens on Citibank's platform.
Is it safe to log in on public Wi-Fi?
It is safer to use your mobile app on a cellular connection or to log in from a private Wi-Fi network. If you must use public Wi-Fi, make sure you are on the real Citibank website (check the URL starts with https://citibank.com) and avoid logging in on shared computers.