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An authorized user on an American Express Platinum card is a person you add to your account who can make purchases using a card linked to your account, but you remain the primary cardholder and account owner. The authorized user has access to the card's benefits and spending power, while you keep full responsibility for the bill.
When you add an authorized user, Amex issues them a physical card bearing their name. They can use it immediately for purchases, and those charges post to your primary account. You control the arrangement entirely—you set spending limits (if you choose), monitor activity, and handle payment.
The authorized user does not own the account. They cannot change terms, remove themselves, access customer service independently on account matters, or make decisions about rewards redemption or account features. You must contact Amex to add, modify, or remove an authorized user.
| Factor | Authorized User | Primary Cardholder |
|---|---|---|
| Account Ownership | No—added by primary | Yes—owns the account |
| Liability for Charges | No—primary is liable | Yes—fully responsible |
| Spending Controls | Primary can set limits | Controls own spending |
| Benefit Access | Limited—depends on card tier | Full access to all benefits |
| Credit Building | May report to credit bureaus (varies) | Yes, builds credit history |
| Account Changes | Cannot make changes | Can modify terms and features |
Authorized users gain access to many Amex Platinum perks—things like lounge access (depending on the benefit structure), purchase protections, and extended warranties. However, they typically cannot access premium concierge services or make account decisions the way the primary cardholder can.
Credit reporting is one nuance worth understanding. Whether Amex reports authorized user activity to the credit bureaus varies and can depend on factors outside your control. Some cardholders add family members hoping to build their credit, while others add authorized users simply for convenience. The credit-building outcome is not guaranteed for either party.
American Express typically charges a fee to add an authorized user on premium cards like Platinum, though the amount varies. You pay this fee regardless of whether the authorized user uses the card. Some people add authorized users temporarily for a specific trip or need, while others maintain them long-term.
Common reasons include:
The primary cardholder should understand that you remain fully responsible for all charges the authorized user makes. There is no separation of liability. You also need to trust the person, as you're giving them direct access to your credit line.
Additionally, consider whether spending limits would help manage usage, how you'll handle the card if your relationship with the person changes, and whether the authorized user benefit fee aligns with how much you'll actually use the arrangement.
You'll contact American Express directly—through their website, app, or phone line. The process is straightforward, and changes typically take effect within days. Removal is equally simple if circumstances change or you no longer need the arrangement.
The key takeaway: authorized users are a tool you control. They work well when there's clear trust and communication with the cardholder about spending expectations, and when you understand that you're legally and financially responsible for everything that happens on the account.
