Amex Additional Card vs Companion Card: Key Differences

You have the Amex Platinum Card and you want to add your partner, a parent, or a frequent travel companion. Amex gives you two paths: an Additional Card (a full authorized user with most Platinum benefits, at $195 per card per year) or a Companion Card (a stripped-down option at $0 that shares the account but not the premium perks). Choosing wrong means either overpaying for benefits someone will not use, or leaving a frequent traveler without lounge access they need.

Side-by-Side Comparison

All terms and fees as of June 2026. Benefits subject to change. Terms and conditions apply.

The Additional Platinum Card ($195/year)

The Additional Card is essentially a second Amex Platinum card. The person who holds it gets their own lounge access, their own hotel status, and their own TSA PreCheck or Global Entry credit. They earn Membership Rewards points on their spending (points pool into the primary cardholder's account, not a separate one). The $195 annual fee per additional cardholder is added to the primary cardholder's account.

Lounge access is the most valuable piece. An Additional Card holder can enter Centurion Lounges independently, without the primary cardholder present. Same for Priority Pass Select lounges, which cover 1,300+ airport lounges worldwide. If the additional cardholder takes solo trips even a few times a year, the lounge access alone can justify the $195. For a full review of what the best airport lounge credit cards offer, see our best airport lounge credit card comparison across the major premium cards.

Hotel status is automatic, not applied-for. Marriott Bonvoy Gold Elite and Hilton Honors Gold both come with room upgrade priority, late checkout, and bonus points on hotel stays. For someone who travels several times a year for work or leisure, these statuses have real monetary value. The Hilton Honors American Express card is an alternative for household members who want dedicated Hilton status and earning without the Platinum fee.

The $120 Global Entry credit every four years means the $100 Global Entry fee is essentially free (extra $20 is yours to keep as a statement credit). This applies to the additional cardholder individually.

The Companion Platinum Card ($0/year)

The Companion Card adds someone to your account at no additional cost. They get a physical Platinum-branded card, they earn 5x points on airfare and Amex Travel hotel bookings, and they get the Global Entry/TSA PreCheck credit. That is roughly the extent of the premium benefits.

They do not get lounge access. They cannot enter a Centurion Lounge independently. They do not receive hotel status with Marriott or Hilton. They do not get CLEAR enrollment, car rental status, or access to Fine Hotels + Resorts benefits on their own reservations.

The Companion Card is primarily useful for a household member who wants to earn points on daily spending under the same account umbrella and who does not travel frequently or independently. Think of it as the account-sharing tool, not the travel benefits tool.

The Math: Does the Additional Card Pay Off?

The $195 annual fee for an Additional Card is worth scrutinizing honestly.

If the additional cardholder travels independently even once a year and uses a Centurion Lounge, they have likely captured $40–$80 in value from that visit alone (comparable premium lounge day passes run $50+). Add Global Entry ($100 every 4 years = $25/year average), Marriott Gold (roughly $50–$100 in room upgrades or late checkout over a year of travel), and Priority Pass access, and the $195 can break even with moderate independent travel.

For a household member who only travels with the primary cardholder and does not need independent lounge access, the Companion Card at $0 is the clear answer. The primary cardholder can bring a guest into most Centurion Lounges anyway. If you are weighing whether the Amex Platinum is worth its $895 base fee at all, see our Amex Platinum vs Capital One Venture X comparison for a premium-vs-premium breakdown.

Points Always Flow to One Account

Regardless of which card type you choose, all Membership Rewards points earned by the additional cardholder or companion cardholder flow into the primary cardholder's Membership Rewards account. There is no separate points wallet. This simplifies redemption but means the additional cardholder has no independent access to redeem points; they must coordinate with the primary cardholder.

One Important Shared Limitation

Both card types put the primary cardholder fully liable for all spending. If an additional cardholder runs up a balance, the primary account holder owes it. Spending limits can be set on Additional Cards; check with Amex for the current controls available through the account dashboard. For a full walkthrough of what the Platinum tier includes before adding anyone to your account, see the Amex Platinum benefits 2026 guide.

Alternatives If the Amex Platinum Is Not the Right Fit

The Amex Platinum's $895 base annual fee plus $195 per Additional Card makes it a significant annual commitment. For cardholders who want a premium card experience with lower total costs, the Aspire® Mastercard® offers rewards and broader credit-range accessibility at a fraction of the cost.

If the household member being added has a thinner credit profile and you are considering options for them to build credit independently, the Perpay Credit Card offers a self-contained credit-building path linked to paycheck payments and reports to all three bureaus.

For primary Amex Platinum cardholders who also want to maximize their investment returns alongside credit card rewards, Robinhood Gold bundles a rewards card and brokerage premium features in a single $5/month membership.

The Bottom Line

Choose the Additional Card ($195) for a household member who travels independently at least two or three times a year, will use airport lounges on their own, and values hotel elite status. The $195 is justified when lounge visits, hotel upgrades, and the Global Entry credit are actually used.

Choose the Companion Card ($0) for a household member who travels with you, does not fly solo, or whose primary use of the account is everyday spending and points earning. There is no benefit to paying $195 for perks that will not be used.

If you are unsure, start with the Companion Card. You can always upgrade to an Additional Card if travel patterns change.

Frequently Asked Questions

Can an Additional Amex Platinum cardholder access Centurion Lounges on their own?

Yes. An Additional Card holder on the Amex Platinum account can access Centurion Lounges independently, without the primary cardholder being present. They can also bring in guests under the standard guest policy. This is one of the most valuable practical differences between the Additional Card and the Companion Card.

Do Companion Card holders earn Membership Rewards points?

Yes, Companion Card holders earn Membership Rewards points on all their purchases at the standard Amex Platinum earn rates (5x on qualifying airfare and Amex Travel hotels, 1x elsewhere). However, those points are deposited into the primary cardholder's Membership Rewards account, not a separate account for the Companion Card holder.

Is there a limit to how many Additional Cards you can add to an Amex Platinum?

Amex allows up to three Additional Cards on a Platinum account. Each one costs $195 per year, adding up to $585 in authorized user fees if you add three. Amex does allow you to set spending limits on each Additional Card through your account dashboard, which can help manage liability.

Does the Companion Card include any lounge access at all?

No. The Companion Platinum Card does not include independent lounge access to Centurion Lounges, Priority Pass, or Delta Sky Club. Companion Card holders may be able to enter a lounge as a guest of the primary cardholder when traveling together, subject to current guest policies and fees. As of June 2026, primary Amex Platinum cardholders can bring in two guests for a $50 fee per guest at Centurion Lounges when the lounge is not at capacity.