Rewards Basics
Why the Wrong Credit Card Is Costing You Money at Checkout
Most cardholders default to a single card for every purchase and quietly forfeit a meaningful share of their potential rewards. This piece examines how that happens and what the research says about it.
By the CreditTally team · July 6, 2026 · 5 min read
Most people carry two or three credit cards and use one of them for almost everything. It is usually the card in the front slot of the wallet, or the one saved in the browser. The difficulty is that no single card earns the top rate everywhere, so every purchase made on the default card at the wrong merchant represents a small, invisible loss.
Those losses compound, and the scale of the underlying economy is easy to underestimate. The Federal Reserve’s Survey of Household Economics and Decisionmaking finds that 82 percent of U.S. adults hold at least one credit card,1 and Experian’s consumer data puts the average cardholder at roughly 3.9 cards.2 The Consumer Financial Protection Bureau, in its most recent report to Congress on the credit card market, calculated that general-purpose cardholders earned more than $40 billion in rewards in 2022 alone.3
82%
of U.S. adults hold at least one credit card
3.9
cards held by the average cardholder
$40B+
in rewards earned by cardholders in 2022
The losses are not limited to paying with the wrong card. A Bankrate survey found that nearly one in four rewards cardholders did not redeem any rewards at all over the prior year,4 which suggests the problem extends across the entire rewards lifecycle: earning less than the wallet allows, and then leaving part of what was earned unclaimed.
Why this happens to almost everyone
Issuers design reward structures to be memorable in isolation and difficult to track in aggregate. One card earns elevated rewards on dining but not groceries. Another earns a high grocery rate, but only at merchants coded as supermarkets, not superstores or wholesale clubs, and only up to an annual cap. A third earns bonus points on travel, at a rate that depends on whether the booking is made directly with the airline or through the issuing bank’s travel portal.
Tracking all of this across even three cards means internalizing a dozen rules that change over time. In practice, few cardholders do. The Consumer Financial Protection Bureau’s periodic reviews of the credit card market document both the growing complexity of rewards programs and the gap between rewards earned and rewards actually realized by consumers.3
The three most common mistakes
- Using a flat-rate card where a category card would earn two to four times more, such as paying for restaurants on a 1.5% card while a dining card sits in the same wallet.
- Missing category caps. Some cards drop from a high promotional rate to 1% once an annual spending limit is passed, and the switchover is silent.
- Ignoring booking channels. Travel rates frequently depend on where the booking is made, and the same flight can earn substantially different rewards depending on the site it is purchased from.
Approaches to closing the gap
The traditional remedy is a reference sheet: a note in the wallet or a spreadsheet listing each card’s categories. This works until an issuer revises a category or a new card enters the wallet, and it still depends on the cardholder remembering to consult it at the moment of payment.
A newer class of tools automates the lookup. The CreditTally browser extension detects the merchant at checkout and shows which of your cards earns the most on that purchase. Either way, the principle is the same: the right card is a per-purchase decision, and the rewards follow when it is made consistently.