Where to use your Costco Rewards Certificate
Your Costco Rewards Certificate can only be redeemed at a Costco warehouse location — you cannot use it online or at Costco.com. You must present the physical certificate or show the digital version on your phone at the register when you check out. The certificate works like a coupon that reduces your total bill, but only at the moment of purchase.
The certificate has an expiration date printed on it. Once that date passes, Costco will not honor it, so check the date before you shop. If you have lost your certificate or it was damaged, contact the Costco warehouse where you received it to ask about a replacement.
Key Takeaways
- Costco Rewards Certificates must be presented at a warehouse register and cannot be used for online orders or at Costco.com.
- The certificate reduces your total purchase amount at checkout, similar to how a coupon works.
- You can use the certificate on any items in the warehouse, including groceries, household goods, and gas, as long as you have not already paid.
- The expiration date is printed on the certificate, and Costco will not accept expired certificates under any circumstances.
- If you received a digital certificate through email or the Costco app, you can show it on your phone instead of carrying a paper copy.
How to present your certificate at the register
When you reach the checkout line, tell the cashier that you have a Rewards Certificate before they start scanning your items. Hand them the physical certificate or hold up your phone to show the digital version. The cashier will enter the certificate number into the register or scan it if it has a barcode.
The certificate amount will be deducted from your total bill. If your purchase is less than the certificate value, you will lose the remaining balance — Costco does not issue change or store credit for the unused portion. If your purchase is more than the certificate value, you pay the difference with your regular payment method.
What you can and cannot buy with your certificate
Costco Rewards Certificates work on almost all merchandise in the warehouse, including fresh groceries, packaged goods, electronics, clothing, and household items. You can also use the certificate toward gas purchases at the Costco gas station if you have enough value to cover part or all of your fill-up.
The main restriction is that you cannot use a Rewards Certificate on items that are already on sale or marked down, depending on the specific terms printed on your certificate. Some certificates also exclude certain departments like the pharmacy or optical center — read the fine print on your certificate to confirm what is covered. Membership renewals and add-ons cannot be purchased with a Rewards Certificate.
Using a digital certificate from email or the app
If Costco sent you a Rewards Certificate through email or the Costco mobile app, you do not need to print it. Open the email or app on your phone and show the certificate to the cashier at checkout. Make sure your phone has enough battery and a clear screen so the barcode or certificate number is readable.
Digital certificates expire on the same date as printed ones. If you received the certificate through email, save it or take a screenshot in case you lose access to that email account. The Costco app will also show your certificate in the "Offers" or "Rewards" section, where you can check the expiration date anytime.
What happens if you forget your certificate
If you completed your purchase without using your Rewards Certificate, Costco cannot add it to a transaction after the fact. You will need to return to the warehouse with your certificate and speak to a manager at the customer service desk. Some warehouses may issue a refund or allow you to use the certificate on a future purchase, but this is at the manager's discretion and not may provide.
To avoid this situation, check your wallet or phone for certificates before you leave home. If you receive a certificate by email, add a reminder to your calendar for a week before the expiration date so you have time to use it.
Combining multiple certificates and payment methods
You can use only one Rewards Certificate per transaction. If you have multiple certificates, you will need to make separate purchases to use each one. Plan your shopping trip accordingly — you might buy groceries on one trip and household items on another if you have two different certificates.
You can combine a Rewards Certificate with other payment methods. For example, you could use a $50 certificate and pay the remaining balance with your Costco credit card, debit card, or cash. You cannot, however, split a single certificate across multiple transactions or save the unused balance for later.
Checking your certificate balance and expiration date
The certificate amount and expiration date are printed directly on the physical certificate. If you have a digital certificate, open the email or the Costco app to view these details. The certificate shows the dollar amount you can redeem and the last day it is valid.
If you are unsure whether you still have an active certificate, log into your Costco account online or check the app under the "Offers" section. You can also ask a cashier or visit the customer service desk at your local warehouse — they can look up your account and tell you what certificates are available to you.
Frequently Asked Questions
Can I use my Rewards Certificate online or through Costco.com?
No. Costco Rewards Certificates only work at warehouse locations during in-person checkout. You cannot use them for online orders, and Costco.com does not accept certificates as payment.
What if my purchase is less than the certificate amount?
Costco does not refund or carry over the unused balance. If your certificate is worth $50 and you spend $30, you lose the remaining $20. Plan your purchase to use as much of the certificate value as possible.
Can I use a Rewards Certificate on sale items?
It depends on the terms printed on your specific certificate. Some certificates exclude sale or discounted items, while others do not. Check the fine print before you shop to confirm what is covered.
What do I do if my certificate expired?
Expired certificates cannot be redeemed. Contact the warehouse where you received it to ask about a replacement, though Costco is not required to issue one. Keep the expiration date visible so you do not miss the important date.
Can I use multiple certificates in one shopping trip?
No. You can only use one certificate per transaction. If you have multiple certificates, you will need to make separate purchases or return on different days to use each one.