You Can Share the Savings With a Household Member
You’re standing in the massive Costco aisle, phone in hand, texting your spouse or adult child a picture of that incredible deal. “We need this!” they reply. But there’s a catch—they don’t have their own membership card, and you can’t always be the one to do the shopping. Or perhaps you’re planning a big purchase together and want to ensure both of you can access the member-only pricing and services.
This is where adding someone to your Costco membership becomes a game-changer. Costco’s primary membership allows you to add one additional household member for free. This person gets their own card with all the same shopping privileges, and it’s a process you can complete entirely online without visiting the warehouse. Let’s walk through exactly how to do it.
Understanding Costco’s Membership Structure
Before you start clicking, it’s crucial to know the rules. A standard Costco Gold Star or Business Membership comes with two membership cards. The first card is for the primary member—that’s you. The second card is for a free household member.
Costco defines a “household” as two adults living at the same address. This is typically a spouse, domestic partner, or another adult family member sharing your residence. The person you add must be at least 18 years old and must not already have a Costco membership in their own name.
If you have an Executive Membership, the same two-card rule applies. The added member will share the membership type and its benefits, including the 2% annual reward on qualified purchases.
What the Added Member Gets
The person you add online receives full membership privileges. This means they can shop in-warehouse and on Costco.com, use the Costco gas station, access tire center services, and utilize member-only travel deals. They will have a separate membership number linked to your account, and any purchases they make will contribute to your household’s annual reward if you have an Executive Membership.
It’s a seamless way to extend your benefits without doubling the cost.
Step-by-Step Guide to Adding a Member Online
The online process is managed through your Costco.com account. Follow these steps carefully.
Gather Your Information First
To make the process smooth, have the following details for the person you’re adding ready before you log in:
– Their full legal first and last name.
– Their date of birth.
– The address (it must match your household address).
– A unique email address for them.
– A photo of them for the digital membership card (a clear, well-lit headshot).
Ensuring the address matches is critical. The system will verify this, and discrepancies can cause the request to be denied or flagged for review.
Log Into Your Costco Account
Open your web browser and go to Costco.com. Click on the “Sign In / Register” link at the top right of the page. Enter your membership number or registered email and your password to access your account dashboard.
If you’ve never set up an online account, you’ll need to register first. Click “Create an Account” and follow the prompts, which will require your membership number and last name to validate your identity.
Navigate to Membership Services
Once logged in, look for the “My Account” dropdown menu or section. Within your account dashboard, find and click on the link for “Membership” or “Manage Membership.” This area contains all the tools for updating your membership details.
On the membership management page, you should see an overview of your current plan, the primary member’s name, and a section for the household member. If the second card slot is empty, there will be an option to “Add a Household Member” or “Manage Secondary Cardholder.” Click that button or link.
Enter the New Member’s Details
You will now see a form. Fill in all the required fields with the information you gathered earlier. The form will explicitly ask for the new member’s name, date of birth, and relationship to you (e.g., spouse, domestic partner, household member).
You will also be prompted to enter an email address for them. This is how they will receive their digital membership card and any account communications. Double-check this email for accuracy.
Upload a Photo and Review
The next step is to upload a passport-style photo of the person. The photo should be a clear, front-facing headshot against a neutral background. This photo will appear on their digital membership card in the Costco app and may be used for in-warehouse verification.
After uploading the photo, carefully review all the entered information. Confirm that the address listed for the new member is identical to the one on your primary membership. Any error here is the most common reason for processing delays.
Submit and Confirm
Click the “Submit” or “Save Changes” button. The system will process your request. You should see an on-screen confirmation message stating that your request has been received. The new member will also receive a confirmation email at the address you provided.
Processing is usually instant, but it can sometimes take up to 24 hours for the new digital card to become fully active in the system. The added member can then download the Costco app, log in with the credentials they’ll set up via the email, and access their digital card immediately for shopping.
What to Do After the Online Addition
Your job as the primary member is mostly done, but there are a few next steps to ensure a smooth experience.
Guide Them to the Costco App
The added member’s primary access will be through the Costco mobile app. Instruct them to download the app (Costco App on iOS or Android), then use the “Sign In” option with the email address you provided. They will need to follow a “Forgot Password” or account setup flow from the confirmation email they received to create their own password.
Once logged into the app, their digital membership card will be visible on the home screen. This barcode is scanned at checkout and the gas pump.
Getting a Physical Card
While the digital card works everywhere, some members prefer a physical card. The online addition process does not automatically mail a plastic card. To get one, the new member must visit any Costco warehouse customer service desk.
They should bring a government-issued photo ID (like a driver’s license) that shows the address matching the membership. The customer service representative will verify their identity against the online account and print a physical card for them on the spot, free of charge.
Troubleshooting Common Online Issues
Sometimes, the online process doesn’t go as planned. Here are solutions to frequent problems.
“Address Does Not Match” Error
This is the most common hurdle. Costco’s system strictly checks addresses. If the person you’re adding recently moved to your address, their official ID or credit report might not yet reflect the change. In this case, the online system may reject the request.
Solution: You may need to visit a warehouse together. Bring documentation that proves shared residency, such as a joint utility bill, lease agreement, or bank statement. The in-warehouse staff can manually override and complete the addition.
No “Add Member” Option Online
If you don’t see the option to add a household member in your online portal, it likely means that slot is already filled. Log into your account and check the membership details page to see if a name is already listed as the second cardholder.
If the slot is empty and the option is still missing, your account type might be involved. Some very old membership formats or corporate accounts may have different rules. Contact Costco Member Services for clarification.
Added Member Cannot Log In
If the person you added didn’t receive a confirmation email, first ask them to check their spam or junk folder. If it’s not there, the email address might have been entered incorrectly during the online process.
As the primary member, you can log back into your Costco.com account, go to the membership management section, and verify or update the email address on file for the household member. Resaving the change often triggers a new invitation email.
Alternatives If Online Addition Fails
If you cannot resolve the issue online, don’t worry. You have two reliable fallback options.
Visit a Costco Warehouse
This is often the fastest solution. Go to the customer service desk at any Costco location. Bring your own membership card and a government-issued photo ID for both yourself and the person you wish to add. If your IDs show the same address, the process takes just a few minutes, and the new member will walk out with a physical card.
This method bypasses all online system glitches and is ideal for immediate needs.
Call Costco Member Services
You can call Costco’s member services hotline. Have your membership number ready. The representative can guide you through the process over the phone and may be able to complete the addition manually in their system while you’re on the call. They can also resend any digital invitation emails.
This is a good option if visiting a warehouse isn’t convenient and you need human assistance to troubleshoot a specific error.
Maximizing Your Shared Membership
Now that you’ve successfully added a member, make the most of it. Set up a shared digital payment method like a linked Costco Citibank Visa card for easier checkout for both parties. Discuss shopping lists and major purchases to maximize your Executive rewards if applicable.
Remember, as the primary member, you are responsible for the annual membership fee. The added household member enjoys all benefits at no extra cost, but the membership remains under your name and financial responsibility.
Adding someone to your Costco membership online is a straightforward process designed for convenience. By following the steps, preparing the right information, and knowing the troubleshooting paths, you can extend the value of your membership to someone else in your home in under ten minutes. It’s one of the simplest ways to double the utility of your membership without doubling the price.
