Compare a Credit Card Beyond the Reward Rate
Weigh the reward rate against your spending that actually qualifies, then subtract annual fees, interest and foreign-exchange costs.
In this article
The reward rate in large type is the most polished part of a credit card offer, and the least decisive. The real reward depends on the spending that actually qualifies, defined by merchant category codes and limited by caps. The annual fee, the exchange fee on foreign-currency purchases and the interest rate on a carried balance all come on top, and each can wipe out the advertised advantage. Included insurance is only worth something if you use it, which means opening the certificate, not the brochure. Three months of statements and an hour of arithmetic are enough to find a card's net value on your own spending, and the result often contradicts the advertising. This article walks through that calculation, the questions to ask before applying, and the cases where the best card is the one nobody advertises: the free card already in your wallet.
Verify what actually earns rewards
The advertised rate applies to eligible spending, and eligibility depends on the merchant's category code, not on what's in your cart. Groceries bought at a warehouse store coded as a wholesaler earn the base rate, and so does gas from a station coded as a convenience store. Then there are caps: the boosted rate often stops after a few hundred dollars a month. And some transactions are excluded. Export three months of statements, sort your spending by the real codes of your stores, then apply the rates, caps and exclusions. The effective rate you get, often well below the advertised one, is the first honest number in the comparison.
Subtract the card's three costs
Three costs trim the reward, each in its own way. The annual fee subtracts directly: a $120 fee takes $6,000 of spending at 2% just to get back to zero. The exchange fee, often 2.5% and built into the rate applied, hits every foreign-currency purchase, including trips and foreign websites. As for the interest rate, it waits for the first carried balance: a single month at 21% erases months of rewards. Price all three on your real volumes. If you carry a balance regularly, the calculation stops there: the interest rate outweighs everything else, and the best card is the one that keeps it lowest.
Value the insurance at its real use
Included protections (travel insurance, rental cars, extended warranties) pad the sales pitch and are sometimes worth something, but only to the extent you use them. Open the certificate, not the brochure: who is covered and the age limits, the maximum length per trip, medical exclusions, the requirement to pay with the card. Then give each protection an honest value based on your real life. Rental-car coverage used three times a year is worth something. Travel insurance that never triggers offsets no fee. The sum of those values joins the net reward in the comparison. Good protections also keep you from buying duplicates at the rental counter or the travel agency, a quiet saving but a real one.
Decide by how you pay the balance
A card's net value depends on something the advertising ignores: what you do with the balance. If you pay in full every month, the card costs you nothing and the net reward becomes the criterion. If you carry a balance, even rarely, interest enters the math and the ranking changes. Do the total for your two or three candidates: effective reward on your volumes, minus the annual fee, minus exchange fees, plus the usage value of the protections, minus interest based on your real payment history. The result often points to a different card than the one on the poster, sometimes the free card you already have. Redo the exercise every year, on the anniversary date: terms change, caps move, and so does your spending.
Quebec scenario
A consultant in Laval is tempted by a card advertising 4% cash back on groceries. Before applying, he exports three months of statements and sorts his spending. A good share of his cart goes through merchants coded as big-box stores, which earn the 0.5% base rate. He also counts the $120 annual fee, the 2.5% foreign-exchange fee on his online purchases in other currencies, and the high interest rate if he carries a balance. On his real spending, the net reward barely beats his current no-fee card. He then looks at the included insurance he would actually use: only the rental-car coverage matters to him. He keeps his card and sets a date to redo the exercise next year, along with a list of the merchant codes that paid only the base rate. Next time it will take a few minutes instead of an evening.
Checklist
- Export three months of statements
- Sort spending by merchant category
- Calculate the real reward with caps and exclusions
- Subtract the annual fee
- Price the exchange markup on foreign purchases
- Check the interest rate in case a balance appears
- List the included insurance actually useful
- Compare net value with the current card
- Redo the exercise every year
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