This article unpacks why credit card borrowing often feels exceptionally expensive for consumers, even when rewards and perks seem generous. It explores the true costs behind credit card lending, why interest rates remain high, what drives issuers’ pricing decisions, and how costs such as defaults, operational expenses, fees and rewards interplay in the economics of credit cards.

We will also look at how different costs underlie what consumers repay, how cards make money for issuers, and why cardholders often underestimate the true cost of carrying balances.

Why Credit Card Rates Feel So High?

Credit cards offer convenience: tap to pay, deferred billing, rewards points or cash back, and sometimes travel perks. But for many consumers, especially those who carry balances month-to-month, the cost of borrowing on a credit card can be steep, often much higher than other forms of credit like personal loans.

In a recent Wharton podcast, finance professor Itamar Drechsler explained that even though promotional literature highlights rewards and zero-interest offers, consumers who revolve balances face persistently high interest charges.

These high rates are not arbitrary: they stem from multiple components embedded in the economics of credit card lending, including default risk, operating costs, marketing expenses, and issuer pricing power.

Credit cards differ from secured loans, like auto or home loans, because they are unsecured, meaning there is no collateral to seize if a borrower defaults. Lenders price interest rates to compensate for this elevated risk, among other factors, which is why credit-card Annual Percentage Rates (APRs) can be significantly higher than other consumer loans.

What Are the True Costs Behind Credit Card Lending?

At a glance, borrowers hear about interest rates, but that’s just part of the picture. Issuers face several cost and revenue components that shape what they charge. Below is a simplified breakdown of major cost drivers and income sources — not all of which are obvious to the consumer.

Before we present a table, it’s useful to note that credit card lending economics include both credit costs (defaults, provisioning) and transaction economics (interchange fees, rewards, operational costs).

Credit Card Economics: Income vs Expense Breakdown

Component	Role in Card Economics	Impact on Consumer Costs / Issuer Pricing
Interest Income	Charged on revolving balances (borrowers who don’t pay off monthly)	Major revenue source; high interest rates fund credit risk coverage
Credit Losses / Defaults	Losses when borrowers fail to repay	Higher losses lead to higher interest rates for risk compensation
Interchange Fees	Fees paid by merchants; shared between issuer and network	Major revenue; subsidises rewards programs
Rewards / Cashback Costs	Points, miles or cash back paid to cardholders	Creates perceived value, partially funded by interchange
Marketing & Acquisition Costs	Cost to attract new cardholders	Encourages issuer to charge higher rates to cover these expenses
Operating Costs	Processing, fraud prevention, customer service	Significant non-interest expense component
Fees (late fees, annual fees)	Fees paid by cardholders for services or penalties	Contributes to issuer income and affects consumer cost

This table shows that credit card costs are multifaceted. Interest income and interchange fees are primary revenue streams, but issuers also shoulder high operating costs and default losses that influence pricing.

Rewards, while attractive for cardholders, are a deliberate expense that encourages spending and require interchange revenue to remain sustainable.

Why Interest Rates on Credit Cards Stay High?

Credit card interest rates often remain elevated relative to other financial products. Several reasons explain this:

Unsecured Credit Means Higher Risk

Unlike mortgages or auto loans, credit cards are unsecured, there is no collateral backing the balance. If a borrower defaults, issuers can only pursue collection, not repossession of assets.

This risk is priced into the APRs cardholders pay. Research shows credit card default losses are relatively large compared with other loan types, a key factor in pricing spreads.

High Operating Costs and Marketing Spend

Issuers incur large operating expenses, from fraud detection to customer service, plus substantial marketing and acquisition costs to attract cardholders. These costs don’t disappear just because a cardholder pays off the full balance each month; they are baked into the economics of running a card portfolio.

According to broader studies on credit card income and expenses, operating costs and non-interest expenses form a significant share of total costs issuers must cover through pricing.

Pricing Power and Consumer Behaviour

Professor Drechsler notes that many consumers are not highly rate-sensitive; rather, they are influenced by rewards, perks, and credit availability. In economic terms, issuers with market power can sustain higher interest rates because many cardholders continue usage despite costs.

This dynamic, high demand for credit combined with limited sensitivity to rate changes, enables banks to price interest rates persistently above other consumer loan products.

How Rewards and Interchange Fit into the Cost Puzzle?

Many consumers use credit cards for rewards programs, cash back, points, airline miles, thinking these perks offset the cost of borrowing. But the relationship between rewards and costs is complex:

Interchange fees are charged to merchants each time a card is used, for example, around ~2.2% of the transaction in some markets, and part of this revenue funds rewards programs.
Rewards expenses are indeed large in aggregate, in 2023, the six largest card issuers spent nearly $68 billion on rewards globally.
Research suggests rewards expenses alone do not fully explain why interest rates are so high; rather, interchange income and interest income interplay in a way that enables both rewards programs and high APRs to coexist.

Key Revenue/Cost Flows in Credit Card Economics

Revenue/Income	Primary Source	Purpose / Use
Interest Income	Borrowers carrying balances	Compensates for credit risk and funds profit
Interchange Income	Merchant fees	Funds rewards, operational costs
Fees (late, annual)	Cardholder charges	Contributes to profitability

Interchange and interest income are the foundation of credit card revenue. Fees contribute further. Rewards, while costly, are largely funded by interchange. However, credit card issuers still rely on interest income to cover credit risk and other costs, which is why interest rates remain high.

What Consumers Often Miss: The True Cost of Carrying a Balance

Most credit card users fall into two categories:

Transactors: pay off their full balance each month, avoiding interest.
Revolvers: carry a balance and incur interest charges.

If you carry even a modest balance month-to-month, interest accrues daily, meaning costs build quickly. Unlike a loan with a fixed schedule, credit card interest can compound rapidly and often catches consumers unaware.

In many markets, issuers must display key terms, such as APR, fees, and grace periods, prominently (e.g., via the “Schumer Box” in the U.S.), yet consumers still underestimate how fast interest accumulates on revolving balances.

Additionally, because many rewards credit cards encourage spending rather than balance payoff, some consumers find themselves paying interest even as they earn points, diminishing the net value of rewards.

Balancing Benefits and Costs

Understanding the true costs behind credit card lending helps consumers make better financial decisions. Credit cards combine convenience, rewards, and flexible credit, but they also embed high interest rates that reflect default risk, operating costs, and issuer pricing strategies.

These costs are not accidental, they result from the complex economics of unsecured lending, marketing expenses, and market dynamics where consumers often prioritise perks over cost.

For consumers, the takeaway is clear: if you carry a balance, you are effectively paying for convenience, risk, and issuer costs through higher interest.

Paying off balances in full whenever possible, choosing cards aligned with your spending habits, and understanding fees and charges can significantly reduce the effective cost of credit card borrowing.

With awareness and discipline, one can enjoy the benefits of credit cards while keeping the costs under control.