| Money Atlas

Introduction

Most Americans assume there is a legal limit on how much interest a bank can charge on a credit card. However, for the vast majority of consumers, no federal law exists that sets a hard cap on credit card interest rates. While some specific groups like active-duty service members enjoy federal protections, the interest rates for most cardholders are determined by a combination of the prime rate and the creditworthiness of the individual borrower. Recent political discussions have proposed a 10% cap on these rates, but as of now, average annual percentage rates (APRs) often range between 20% and 30%.

MoneyAtlas provides the tools and data necessary to compare these rates across hundreds of different products, starting with our best credit cards comparison, so you can understand the real cost of borrowing. This article explores the existing legal framework, the special protections for military families, and the potential impact of proposed legislation that could change how much interest banks are allowed to charge.

For a deeper primer on the current market, see how much the credit card interest rate is for US consumers.

The Reality of Federal Interest Rate Limits

The most important thing to understand about credit card interest is that federal law generally focuses on transparency rather than price controls. The Credit Card Accountability Responsibility and Disclosure (CARD) Act of 2009 introduced many protections, such as requiring 45 days' notice before most rate increases and limiting how fees are charged. However, it did not set a maximum interest rate.

For most cardholders, the interest rate is a variable figure. This means it can fluctuate based on broader economic conditions. Most credit card agreements use a formula: the U.S. Prime Rate plus a margin determined by the bank. If the Federal Reserve raises or lowers the federal funds rate, the Prime Rate moves in tandem, and your credit card APR typically follows within one or two billing cycles.

If you want a side-by-side breakdown of current pricing, what is the average credit card APR is a helpful benchmark.

The Marquette Decision and State Laws

You might wonder why your own state's usury laws, which limit interest rates on loans, do not seem to apply to your credit card. This is due to a 1978 Supreme Court case known as Marquette National Bank of Minneapolis v. First of Omaha Service Corp. The court ruled that a national bank can charge interest based on the laws of the state where it is headquartered, regardless of where the customer lives.

This ruling is why many major credit card issuers are headquartered in states like South Dakota or Delaware. These states have either very high interest rate caps or no caps at all. This allows banks to export those higher rates to customers across the country, effectively bypassing local state interest rate limits.

Federal Protections for Service Members

While the general public does not have a federal interest rate cap, the U.S. government has established strict limits for members of the military. These laws recognize the unique financial pressures faced by those in active service.

The Military Lending Act (MLA)

The Military Lending Act is a federal law that provides significant protections for active-duty service members and their covered dependents. Under this act, the Military Annual Percentage Rate (MAPR) for most types of consumer credit, including credit cards, is capped at 36%.

The MAPR is a broader calculation than a standard APR. It includes not just the interest rate, but also most fees associated with the card, such as application fees or participation fees. This ensures that lenders cannot bypass the 36% cap by adding excessive hidden costs.

The Servicemembers Civil Relief Act (SCRA)

The Servicemembers Civil Relief Act provides a different type of protection. It limits the interest rate on debt that was incurred before the individual started active-duty service. If a person has a credit card with a 24% APR and then joins the military, the SCRA requires the lender to drop that rate to 6% for the duration of their active service.

This protection is not automatic. The service member must provide the creditor with a written notice and a copy of their military orders. Once requested, the lender must apply the 6% cap retroactively to the date active service began.

If you want a broader look at how APRs work in practice, what APR means for credit cards explains the calculation in plain English.

Proposed 10% Interest Rate Caps

In recent months, there has been significant debate regarding a proposed executive order or legislative push to impose a temporary 10% cap on all credit card interest rates. Supporters of the move argue that with average rates hovering around 25%, many American families are trapped in a cycle of debt that they can never repay.

The Case for a Lower Cap

Proponents, including various lawmakers, argue that a 10% cap would provide immediate relief to the roughly 46% of U.S. households that carry a balance from month to month. According to some estimates, a 10% cap could save Americans approximately $100 billion per year in interest payments. This money would theoretically be redirected back into the economy through consumer spending rather than bank profits.

The Argument Against a Lower Cap

Banking industry groups, such as the American Bankers Association, have voiced strong opposition to a 10% cap. Their primary argument is that interest rates reflect the risk of lending money. Because credit cards are unsecured debt, meaning they are not backed by collateral like a house or a car, they carry a higher risk for the lender.

If a 10% cap were enacted, banks might respond by:

Tightening lending standards: Borrowers with lower credit scores might find it impossible to get a credit card.
Reducing credit limits: Existing cardholders could see their available credit slashed to reduce the bank's exposure.
Increasing fees: Banks might introduce or increase annual fees and late fees to make up for lost interest revenue.
Eliminating rewards: Popular programs like cash back or travel points could be scaled back or removed entirely.

For context on how the market currently stacks up, how high credit card interest rates are right now offers a useful snapshot.

How Credit Card Interest Rates Are Calculated

To understand why your rate is what it is, you have to look at the components that make up the APR. Most credit cards use a variable rate system that changes periodically.

The Prime Rate

The foundation of most credit card rates is the Prime Rate. This is a benchmark rate that banks charge their most creditworthy corporate customers. It is almost always 3% higher than the federal funds rate set by the Federal Reserve. When the Fed raises rates to combat inflation, the Prime Rate goes up, and your credit card interest follows.

The Margin

The second part of the equation is the margin. This is the additional percentage the bank adds to the Prime Rate to cover their operating costs and profit. For example, if the Prime Rate is 8.5% and your bank's margin is 12%, your total APR would be 20.5%.

Your specific margin is usually determined by your credit score and financial history. Someone with an excellent credit score might have a margin of 10%, while someone with a fair score might have a margin of 20% or more. This is why it is essential to compare offers using the tools available through our platform, as different banks may offer vastly different margins for the same credit profile.

Daily Periodic Rate

While the APR is the annual figure, banks actually calculate interest on a daily basis if you carry a balance. They do this by dividing your APR by 365 to find the daily periodic rate. This rate is then applied to your average daily balance throughout the billing cycle. Because interest compounds, the effective rate you pay can be slightly higher than the stated APR if you do not pay the balance off quickly.

For a more detailed walkthrough, see how to calculate your credit card interest rate.

The Cost of High Interest Rates

When there is no cap on interest rates, the cost of carrying a balance can become overwhelming. To see why this matters, it helps to look at the math behind a typical credit card balance.

Consider a $5,000 balance on a card with a 24% APR. If the cardholder only makes a minimum payment of 2% of the balance (starting at $100), the results are stark:

Time to pay off: It could take over 20 years to eliminate the debt.
Total interest paid: The cardholder could end up paying more than $8,000 in interest alone, more than doubling the original cost of the purchases.

This is why many consumers are looking for ways to lower their rates, even in the absence of a federal cap. Options like our balance transfer credit cards comparison often provide a 0% introductory APR for 12 to 21 months. These offers allow you to pay down the principal balance without accruing new interest, provided you can qualify for the new card.

How to Check and Manage Your Current Rate

Since there is no universal cap, the responsibility falls on the consumer to monitor their rates and shop for better options. You can find your current interest rate on your monthly statement, usually in a section titled "Interest Charge Calculation" or "APR Summary."

If you find that your rate is too high, here is a step-by-step process to potentially lower your costs.

State-Level Developments

While federal law is stalled on interest rate caps, some states have attempted to take matters into their own hands. For example, some states have passed laws attempting to limit the interest rates that can be charged on "rent-a-bank" schemes, where non-bank lenders partner with out-of-state banks to bypass local usury laws.

However, these state laws are frequently challenged in court by the banking industry. The conflict between state consumer protection and federal banking preemption is a constant struggle in the U.S. legal system. For now, the "headquarters rule" established by the Marquette decision remains the dominant force in the industry.

What to Look for When Comparing Rates

When you are using our comparison platform to find a new credit card, don't just look at the lowest possible rate. You should also consider how the rate is structured.

Variable vs. Fixed: Almost all modern cards are variable. This means your rate will go up if the Federal Reserve raises rates.
Penalty APRs: Some cards will hike your interest rate to 29.99% or higher if you make a single late payment. Look for cards that do not have a penalty APR.
Promotional Rates: A 0% APR is great, but check what the rate will be once the promotion expires. That "go-to" rate is what you will live with long-term.
Grace Periods: Ensure the card has a grace period of at least 21 days. This allows you to avoid interest entirely if you pay your statement in full every month.

MoneyAtlas tracks thousands of data points on these terms to help you see past the marketing and understand the real cost of each card. For more on evaluating offers, what APR is good for credit card purchases and balances can help you frame the numbers.

Future Outlook for Interest Rate Legislation

The debate over a 10% credit card interest rate cap is likely to continue through the next several legislative cycles. As household debt reaches record highs, the pressure on lawmakers to act increases.

There are several ways this could play out:

Direct Legislative Cap: Congress could pass a law similar to the Military Lending Act that applies a cap (perhaps 15% or 36%) to all consumers.
Executive Action: A president could attempt to use executive orders to pressure regulators to limit rates, though this would likely face immediate legal challenges.
Enhanced Competition: Regulators could focus on making it easier for consumers to switch cards, forcing banks to lower rates to compete for customers.

Regardless of the political outcome, the best defense against high interest rates is a combination of a strong credit score and a willingness to move your business to a lender that offers better terms.

Conclusion

The lack of a general federal cap on credit card interest rates means that consumers must be their own best advocates. While service members have specific legal protections at 36% and 6%, the average civilian could face rates as high as 30% or more depending on their credit history and the state where their bank is located. Proposals for a 10% cap represent a significant potential shift in the industry, but they remain speculative for now.

To minimize the impact of high interest rates on your finances:

Monitor your APR on every monthly statement.
Maintain a high credit score to qualify for the lowest possible margins.
Utilize balance transfer offers to pause interest growth on existing debt.
Compare new card offers regularly to ensure you are not paying more than necessary.

The most effective way to navigate this environment is to see all your options in one place. By comparing the terms and fees of different products, you can make a decision that protects your financial future.

What Is the Cap on Credit Card Interest Rates?