Money

How credit card rewards actually get paid for

By Leandro Bruzaferro · · 5 min read
A card being tapped on a payment terminal
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This is informational and not financial advice.

Rewards cards are marketed as though the points arrive from nowhere. They do not. Every cashback dollar and every airline mile is funded by an identifiable flow of money, and understanding where that money comes from tells you exactly when a rewards card is a good deal and when you have become the person paying for someone else’s.

Where the money comes from

Three sources fund a rewards programme, in descending order of size.

Interchange fees. When you pay by card, the merchant does not receive the full price. A fee is deducted and split between the bank that issued your card, the payment network and the merchant’s processor. The issuing bank’s share is the largest, and it is the primary funding source for rewards. Premium cards carry higher interchange rates than basic ones, which is precisely why the generous cards are the ones merchants complain about.

Interest paid by people who carry balances. Cardholders who do not clear the balance each month pay interest at rates that sit far above almost any other consumer borrowing. This is the second pillar, and it is the one that makes the programme profitable rather than merely self-funding.

Annual fees and penalty charges. Card fees, late fees, foreign transaction fees and cash advance charges. Smaller in total, but high margin.

Following one purchase

The clearest way to see it is to trace a single transaction. Percentages vary by card tier, merchant category and country, so treat the shape as the lesson rather than the exact split.

Step What happens Who gains or loses
You pay $100 at a shop Card is charged the full amount You are out $100
Interchange is deducted A percentage is taken before the merchant is paid Merchant receives less than $100
The fee is split Issuing bank takes the largest share; network and processor take the rest Your bank is now holding the funding for your rewards
Rewards are credited A portion of the bank’s share is returned to you as points or cashback You receive part of a fee the merchant paid
Merchant sets prices Card acceptance costs are built into shelf prices for everyone Cash payers subsidise card users

The last row is the part rarely stated plainly. Merchants generally cannot charge card users more in many markets, so acceptance costs are absorbed into the price everybody pays. Rewards are therefore not created value; they are a redistribution from people who pay with cash or basic cards toward people who pay with premium ones.

That is an argument about fairness rather than about your own finances. It does not make using a rewards card irrational. It does explain why the system is under regulatory scrutiny in several countries.

When the points stop being free

The arithmetic flips the moment you carry a balance, and it flips hard.

A card paying two per cent back, on a balance carried at an interest rate above twenty per cent, loses money every month by an order of magnitude. The rewards are calculated on what you spend; the interest is charged on what you owe, at roughly ten times the rate. No rewards programme in existence closes that gap.

This is why the honest first question is not which card earns the most, but whether you clear the statement in full every month. If the answer is no, the correct card is the one with the lowest rate and no rewards at all, and the rewards question does not arise until the balance is gone.

Two secondary traps are worth naming.

Spending inflation. Studies of payment behaviour consistently find that people spend more when paying by card than by cash, and more still when chasing a bonus threshold. A signup bonus that requires a spending target within three months is designed around this.

Annual fees that outrun the benefit. A premium card is worth its fee only if you use the specific benefits it attaches. Counting benefits you would never have bought as savings is how people justify fees that cost them money.

Reading a rewards offer honestly

Four questions cut through most marketing.

What is the effective return on my actual spending? Not the headline rate on a bonus category, but the blended rate across where your money really goes. A card paying a high rate on restaurants is worth little if most of your spending is groceries and utilities.

What is the redemption value? Points are not dollars. The value depends on how you redeem, and the least favourable redemptions are the most convenient ones. Any programme where the currency is not fixed to cash can be devalued by the issuer without notice, and periodically is.

What does the bonus actually require? A large signup bonus behind a spending threshold you would not otherwise reach is a discount on spending you did not need.

Would I keep this card if the rewards stopped tomorrow? Issuers change terms. A card that only makes sense under the current programme is a card you will re-evaluate under pressure.

The order that follows from this

If you carry a balance, the rewards conversation is a distraction and the interest rate is the only number that matters.

If you clear the balance in full every month, a rewards card is close to free money for you personally, funded by merchant fees and by other cardholders’ interest. Pick for effective return on your real spending pattern rather than for the headline rate, be sceptical of points whose value the issuer controls, and treat annual fees as a purchase you are making rather than a discount you are receiving.

The programme is not a gift. It is a business with identifiable payers, and knowing which side of it you are on is the whole of the analysis.

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