Whenever you sign up for a new credit card, you’re always asked if you want to add a supplementary card or an authorized user credit card. These two options are the same thing and sometimes people refer to it as a joint credit card.

Getting a supplementary card is a great option for many people for a variety of reasons (which I’ll outline below), but have you ever wondered if there are any risks involved or how your benefits work? There are a lot of things to consider when deciding if you should add a supplementary card so don’t click yes right away. So how do supplementary credit cards work? I’ve got the answers for you!

Supplementary card annual fees

When it comes to the supplementary credit card annual fees, consider it separate from the primary cardholder. If you have one of the best credit cards with no annual fee, you likely won’t have to pay an annual fee when you add a supplementary card.

However, if your credit card does come with an annual fee, then you’ll likely have to pay an annual fee for any supplementary credit cards that you add. The good news is that the annual fee of any supplementary card is usually lower than the fee that the primary cardholder pays, but you also need to consider any promotions available.

For example, the BMO World Elite Mastercard usually has a promo where the annual fee of $150 is waived for the first year. If you add an authorized user credit card, that would cost you an annual fee of $50 since the fee is not waived for the supplementary card.

That said, you don’t always pay a fee for the supplementary credit card. If you look at the Amex joint credit card fee for the American Express Gold Rewards Card, you can add one supplementary card for free which normally costs $50. Better yet, when you using a referral link to apply for the card, you also get an extra 5,000 American Express Membership Rewards points for free when adding a supplementary card.

As you can see, it’s important to know how do supplementary credit cards work so you don’t get caught paying fees you weren’t expecting.

Supplementary card sign up bonuses

If you decide to add a joint credit card when you sign up for a new credit card, you won’t get double the sign up bonus even if you meet the minimum spend requirement with both cards. The good thing about supplementary credit cards is that the spending made on that card counts as overall spending if you’re trying to meet the minimum spend to get your welcome bonus.

Generally speaking, there’s no sign up bonus that you would get when you add an authorized user credit card, but as mentioned above, the Amex Gold Rewards Card does give supplementary cardholders a bonus when using a referral link.

That said, some credit card companies have experimented with offering a sign up bonus when you add a supplementary card. TD Bank had a promo recently which required you to sign up to get part of your welcome bonus. This was annoying since not everyone needs a joint credit card and there was a fee charged to the joint cardholder’s account. This is pretty annoying so I’m happy they haven’t used that tactic in a while. If they do bring it back, they should add a bonus like American Express.

Earn and redemption rate

When it comes to the earn rate with joint credit cards, it’s exactly the same for both cards. Let’s say you have the Marriott Bonvoy American Express Card. The earn rate is 5 Marriott Bonvoy points for every $1 spent on eligible purchases at participating Marriott Bonvoy properties and 2 points per dollar spent on all other purchases. It doesn’t matter if you’re the primary cardholder or you’re using the authorized user credit card, you both earn the same number of points.

Supplementary cardholders can not make redemptions directly. Since you’re pooling your miles and/or points, everything ends up in the primary cardholder’s account. This isn’t a big deal since the primary cardholder can just make a redemption on behalf of the joint cardholder. However, that could still pose a problem if you’re not travelling with the primary cardholder as your included travel insurance (with the exception of travel medical) wouldn’t be included. 

Do supplementary credit cards affect your credit score?

If you’re the supplementary card, there is no effect on your credit score at the time of application. The primary cardholder typically sees a decrease in their credit score of 10 points, regardless of how many authorized credit card users they add. This happens because a hard check is performed whenever you apply for new credit.

Although supplementary credit cardholders may like the idea of their credit card not affecting their credit score, it can actually work against them. Only the primary cardholder gets their credit history reported to the credit bureaus. If you’re the joint credit cardholder and you’re trying to build a credit history, you wouldn’t be able to do it. You’d be better off applying for a credit card where you’re the primary cardholder.

Credit card debt

Ultimately, any credit card debt incurred by the supplementary cardholder is the responsibility of the primary cardholder. In theory, the authorized user credit card could rack up a huge amount of debt and have no worries. Of course, you wouldn’t want to do that since presumably, the primary cardholder is someone you’re tight with.

On the flip side of things, the primary cardholder should think hard before they add supplementary credit cards. If it’s your partner, child or a caregiver, you’re probably fine, but you don’t want to add a friend who has problems getting their own credit card.

Cardholder benefits

Just because you have a supplementary card, that doesn’t mean you’re automatically entitled to the benefits that the primary cardholder gets. To make things more complicated, every credit card has different rules about the benefits that authorized users get, so you need to read the fine print. For example, the American Express Platinum Card clearly states that joint cardholders get the following benefits:

  • The American Express Global Lounge Collection
  • Platinum Concierge and Global Dining Collection
  • Toronto Pearson International Airport Benefits
  • Hertz and Avis Car Rental Benefits
  • Platinum Card Travel Service
  • American Express Invites
  • Travel insurance

The one major benefit that they don’t get which the primary cardholder does get is the annual $200 travel credit. This should be obvious since the annual fee for the secondary card is $175, but you’d be surprised how many people assume they still get it.

Now, if you look at the Scotiabank Passport Visa Infinite Card’s welcome kit, you might be surprised to learn that the Priority Pass Membership and six free annual lounge visits don’t apply to the supplementary cardholder. Many people don’t expect six free passes to be given to both the primary and supplementary cardholders, but sometimes people are shocked to learn that the secondary cardholder can’t use any of the lounge passes unless the primary cardholder is present.

Final thoughts

Are you still wondering if getting a supplementary credit card is worth it? You need to look at the circumstances of your decision. If you’re looking to pool your points or you want to give someone access to credit, then it definitely makes sense to have a supplementary card.

How do Supplementary Credit Cards Work?

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