How Do Credit Cards Work?

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Credit cards are useful financial tools that can help you build credit, save money, and earn rewards. But before you apply, understanding how credit cards work can help you avoid some common pitfalls of using credit — from taking on high-interest debt to hurting your credit score.

The ins and outs of credit cards can vary depending on the type of card, the credit card company, and other factors. But there are a few credit card basics that can help you prepare to use credit responsibly.

Most importantly, use your credit card just like a debit card. Charge only what you can afford to pay off by your monthly due date and pay the balance in full and on time each month. Over time, you’ll establish good credit and avoid costly high-interest debt balances.

Many cards charge double-digit APRs on balances, but if you follow this golden rule of credit cards, you won’t be on the hook for anything. In fact, the most responsible credit cardholders never pay any interest at all. 

“I think it’s grossly unfair to vilify credit cards. It’s the only extension of credit where interest is optional,” says John Ulzheimer, a credit expert formerly of FICO, Equifax and “If I don’t ever carry a balance, I’m never gonna pay interest.”

Here’s more about how credit cards work, and what you should know before you apply:

What Is a Credit Card?

You may want a credit card for a few reasons: To build credit, earn rewards on everyday purchases, or take advantage of purchase protections that some debit cards don’t offer. 

With a credit card, you can make purchases now and pay for them later. When you’re approved for a credit card, you’ll be assigned a credit limit. You can spend up to that amount, and pay the balance down over time. 

When you don’t pay off your card balance in full each month, the bank charges you interest on the remainder of the balance. “There is lots of money to be made by the credit card companies by charging this interest,” says Ira Rheingold, executive director with the National Association of Consumer Advocates.

“Using a credit card is essentially getting a loan from the bank,” he says. It’s sort of a short-term loan, and you can pay for it in two ways, he says: fees and interest charges.

How Do Credit Cards Work Exactly? 

Credit cards are issued mainly by banks and credit unions. There are four major payment networks that credit cards operate on: American Express, Discover,  Mastercard, and Visa.

Companies often partner with banks to issue their own credit cards; these are known as co-branded credit cards. Most airlines, hotels, and major retail stores have co-branded cards.

Credit card purchases work very similarly to debit card purchases. You’ll only be able to spend up your credit card limit, although you should avoid spending close to the limit. Keeping your credit card utilization — or the amount of available credit compared to your balance — low can keep you from taking on credit card debt and hurting your credit score. 

After you make a purchase, it’ll be added to your credit card balance — the amount of money you owe the credit card company. Credit cards have monthly billing cycles, so each month you’ll receive a statement with your balance due and the due date. If you don’t pay your balance in full each month, you’ll accrue interest on the remaining balance until your debt is paid in full. Keep in mind that credit card interest accrues daily and can add up quickly. 

Depending on your card, you may also earn rewards on your credit card purchases. Your rewards will appear on your credit card statement and your card account. Depending on your credit card type, you may be able to redeem the rewards toward statement credits, travel, gift cards, or a direct deposit into a bank account.

Key Terms to Know When Getting a Credit Card 

  • APR/Interest Rate: Your credit card APR — or annual percentage rate — is the interest rate, expressed in annual terms. The APR represents the percentage you’ll pay on any revolving debt. Credit cards charge very high interest rates — many are above 10% and may range upwards of 25%. You’ll have the best chances of scoring a lower APR with great credit. 
  • Balance: A credit card balance is the amount of money you owe your credit card issuer. If you carry an outstanding balance, this amount will include interest. It’s best to pay your balance in full each month to maintain a good credit score and avoid paying interest.
  • Cash Advance: A cash advance is a way to get cash using your credit card at an ATM or bank. You’ll have to pay your cash advance back and most require a fee. Most credit card issuers also have a cash advance limit. 
  • Credit Limit: Your credit limit is the maximum amount of money you can spend using your card. But even if you have a high credit limit, that doesn’t mean you should borrow money up to the limit. Spending up to your card’s credit limit — especially if you can’t pay it off in full — can be damaging to your credit score and credit history over time, and lead to debt. 
  • Minimum Payment: The minimum payment is the portion of your overall balance you’ll need to pay to keep your account current and avoid penalties. While the minimum payment is all you’re required to pay by your monthly due date, paying your balance in full each month instead is key to avoiding high-interest debt. 

How Do I Get a Credit Card? 

If you’re considering opening a credit card account, you should know your credit score and credit history before you apply. Credit cards with the most valuable perks and rewards often require good to excellent credit, while some cards, like a secured credit card, are designed for building credit and have less-strict requirements. 

Next, determine what type of credit card you want. A cash back credit card that earns rewards on everyday spending, for example, is likely a better starter card than a balance transfer card for paying down debt. Compare rewards categories among a few different cards to make sure they align with where you spend most. Also consider when you’ll want to apply. If you’re planning a summer vacation or home remodel, you may time your application to take advantage of a welcome bonus and earn rewards. 

Whichever credit card you pick, make sure you use it responsibly and practice good credit habits. When you’re approved, read the fine print to understand your agreement, any fees, and other terms. If you have questions about the credit card, application, or qualifications, you can always call your card issuer for assistance.

Remember, it’s best to only apply for one card at a time to reduce the risk of hurting your credit score or approval odds. If you’re denied, ask the issuer to provide a reason, and consider taking time to improve your credit before applying again or applying for a different credit card with better approval chances. 

What’s the Difference Between a Credit Card and a Debit Card?

When you pay with a credit card, you’re borrowing money from a financial institution, so it can be easy to spend more than you have. But a debit card works differently.

With a debit card, you’re paying with your own money you already have in your checking account. A debit card will never leave you with debt or interest charges if you don’t pay back the bank — since you can’t spend more than you have.

However, depending on your bank there could be fees associated with a debit card. You may pay ATM or overdraft fees. But these are easily avoidable, and are usually small compared to the credit card interest you’d pay on a big balance.

Should I Get a Debit Card? 

Credit cards are great tools for building credit and earning rewards. But you may choose a debit card instead of a credit card if you are worried about taking on debt or overspending with a credit card.

If you don’t believe that you can responsibly use a credit card, practice budgeting and managing your spending with your debit card before applying for a credit card.

Beyond the opportunity to build credit, credit cards offer rewards on your spending. Many debit cards offer rewards and perks similar to credit cards, and if you’re concerned about debt, a rewards debit card may offer the chance to benefit from rewards without the risk.

Many people have both a debit card and a credit card, and strategize using both. Here are a few other reasons why a debit card may be a good option: 

  • Access to cash without paying fees 
  • No annual fees 
  • Typically no approval process to get debit card perks or rewards 
  • Avoiding monthly payments, late payment charges, and interest
  • Start budgeting and tracking spending habits 

Reasons to Get a Credit Card

Getting a credit card to buy something you can’t pay for outright is never a good idea. But there are plenty of reasons to sign up for one. For one, it can help build your credit, and credit cards offer much more generous rewards than debit cards.

Building Credit

Having a credit card will help build your credit in a few ways. When you pay your credit card bill on time each month this shows up on your credit report. Your payment history accounts for 35% of your FICO score, so paying your credit card bill on time is one of the best things you can do to improve your credit. 

But if you miss payments, that will have a significant and negative impact on your credit score. And carrying a balance on your card will increase your credit utilization ratio, which will decrease your credit score.

Sign-Up Bonus Offers

The quickest way to earn rewards with a credit card is to take advantage of a generous sign-up bonus if it offers one. The best bonuses range in value from a few hundred dollars to $1,000 or more.

When you apply for a credit card be sure to carefully read the terms because you’ll need to meet certain criteria in order to qualify for the sign-up bonus. Typically, you’ll have to spend a certain amount (using the card) within a specific time period before you earn the bonus rewards. And bigger bonuses usually have higher minimum spending requirements.


There are many different types of credit cards, with each offering varying types of rewards, from cash back to airline miles, or points. So when you’re comparing credit cards, make sure to consider what you’re looking to get out of a credit card. Some credit cards charge annual fees as well, so make sure to do the math and make sure you’d be earning enough rewards to outweigh it. 

You’ll also want to pay attention to not just the type of rewards, but also the bonus spending categories. Some cards earn bonus rewards for specific categories of purchases, like travel, dining, or groceries. So you should consider applying for the card that will earn extra points on what you normally spend the most on.

Introductory 0% APR Offers

In addition to sign-up bonuses, some cards will offer an introductory 0% APR on purchases or balance transfers. If you currently have a balance on a credit card, taking advantage of a 0% APR offer is a potentially great way to save on interest charges.

Just keep in mind that the 0% APR period will only last anywhere between six to 18 months — depending on the card. After that, you’ll be paying the usual APR — usually variable — that comes with most credit cards.


While credit card debt can be expensive, if you have an emergency, they can provide some financial flexibility. It’s better to have an emergency fund, but being able to pay over time with a credit card can allow you to stay on your feet when you have unexpected bills pop up. 

Types of Credit Cards

The type of credit card that is best for you depends on your financial goals, budget, spending habits, and how you prefer to earn and use credit card rewards. Cash back credit cards are ideal if you prefer simpler rewards-earning structure. Travel credit cards are great for anyone who travels a lot — or anyone looking to upgrade their next vacation with a posh business-class flight or luxury hotel. Understanding the different types of rewards makes it easier to choose the right credit card for you.

Cash Back Cards

Cash back credit cards are the most straightforward type of credit card. You’ll always know the exact value you’re getting for every purchase, and you can use cash back for anything. The one exception here would be credit cards with rotating cash back categories — which can be a pain to keep track of.

Since travel isn’t on the table for most people right now, a cash back card may be the perfect choice for you. You can earn rewards to use for immediate needs, or save your cash back to book your next vacation once travel opens up.

Travel Credit Cards

Travel credit cards can be the most lucrative type of credit card, but they can also be the most complicated. Travel cards that offer flexible rewards are the most valuable because many (not all) allow you to transfer the points you earn to different airline and hotel loyalty programs.

This gives you more options for using your points, but it also means you may need to navigate the rules of multiple rewards programs. But having the option to redeem a reasonable number of travel points to book an international business-class flight or $500-a-night hotel room is usually the most rewarding way to use credit card rewards.

Rewards Credit Cards

Many companies issue rewards credit cards that offer specific benefits when you make purchases. Most major airlines and hotels have co-branded cards that not only allow you to earn rewards with their loyalty program, but also come with additional perks. An airline credit card may have a free, checked-bag benefit and certain hotel credit cards grant you automatic elite status with that specific hotel chain.

Rewards cards are a good option if you’re highly loyal to a specific brand. But if you prefer to shop around for the best deal, the ongoing benefits of a brand-specific rewards card may not be worth it for you.

When you pay with a credit card, you’re using someone else’s money, so it can be easy to spend more than you have. 

Secured Credit Cards

You may choose a secured credit card if you have no credit history or bad credit. Most secure credit cards work just like normal credit cards, but require a security deposit upon approval. 

The deposit will act as your line of credit and collateral for the card issuer. Most card issuers automatically review your account after a certain period of time to refund your deposit and consider upgrading you to an unsecured credit card. 

Balance Transfer Cards 

A balance transfer card helps you pay off debt by transferring your balance from an existing credit card or loan to one with an introductory 0% APR. During the intro period, you can make payments directly toward the principal balance without accruing interest. After the introductory period ends, you’ll have to pay the card’s regular APR on the remaining balance. The goal is to pay as much as possible during the 0% APR period to save money on interest and pay off your balance faster. 

How to Use a Credit Card

Credit cards can be a great way to build your credit score, when used properly. Consistently paying off your credit card in full and on time each month will help improve your credit score over time, Ulzheimer says. 

That really is the best way to use a credit card – as an extension of your bank account. Ulzheimer believes a card’s annual percentage rate (APR) should be irrelevant. “If the most important metric you’re looking at when you compare credit cards is interest rate, I would almost suggest you’re looking at the wrong product,” he says. You shouldn’t go into a relationship with a card issuer expecting to carry a balance. In that case, he suggests a debit card or charge card that must be paid off each month as better options.

Once you’ve built a healthy relationship with credit cards, you can also take advantage of rewards programs. As long as you’re paying your bill each month in full and on time, rewards credit cards can be a great way to get cash back for travel or other expenses. Many credit cards also come with hidden perks, like extended warranty benefits or built-in rental car insurance. So your credit card could save you money in more ways than you may realize.

How to Be Smart With Your Credit Card When Times Are Tough

If you’re going through financial hardship, credit cards are not a long-term solution, even if they aren’t as bad as payday loans or payday loan apps. But there are steps you can take to minimize the cost of using a credit card to get by.

Pro Tip

Never pay only the minimum amount of your credit card balance each month. If you do that, you’ll end up paying much more in interest charges than the original balance.

In this case, credit cards are not a long-term solution, even if they aren’t as bad as payday loans or payday loan apps. But there are steps you can take to minimize the cost of using a credit card to get by.

You should do everything possible to at least meet the minimum payment requirement each month. If you’re just one day late on a payment, you’ll usually get hit with late fees and may trigger a penalty APR. A penalty APR is a much higher APR that typically applies for at least six months.

Most credit cards have a cash advance feature which allows you to use your credit card to get cash, but it’s an expensive option. Cash advance fees are typically $10 or 5% of what you withdraw, whichever is higher. A credit card cash advance typically comes with a higher APR than a standard purchase.

If you’ve missed a payment or are carrying a balance, it’s worth calling the bank and explaining your situation. Better yet, if you think you might miss a payment, call your credit card issuer to discuss the situation in advance

What to Watch Out For With Credit Cards

Credit cards come with an assortment of fees you should be aware of, because most of them are completely avoidable if you understand when they’ll apply.

The first thing to look at is a credit card’s annual fee. This is a flat fee you pay each year just to have the card. In some cases, the value of rewards and other perks can make the annual fee worth paying. 

Let’s say your annual fee is $129. If your spending yields more than $129 in rewards, then the annual fee is worth it, Ulzheimer says. However, if you’re at all unsure about whether or not it’s worth it to pay an annual fee, then just keep it simple with a no-annual-fee card. This is especially true if it’s your first credit card.

Once you have a card, the cost that can end up being the most expensive is interest. You’ll typically only be charged interest if you don’t pay off your balance in full each month. Credit cards usually only require small minimum payments to avoid late fees, but paying only the minimum payment means carrying over a balance that will incur interest charges. The minimum payment is often a small amount, like $25 or 1%-2% of your total balance, so if you only pay the minimum amount due each month, you could end up paying much more in interest than the amount of your original balance.

A basic credit card calculator illustrates just how much you can end up paying in interest by only making minimum payments:

BalanceInterest RateMinimum Monthly PaymentInterest PaidTotal PaymentsTime to Pay Off
Credit Card$2,000.0015%$30.00$5,900.76$7,900.7630+ years

There are other fees that may apply in specific situations. Some cards charge foreign transaction fees when you’re making purchases in a foreign currency. Credit cards also charge cash advance fees, and unlike with a regular purchase, interest is charged on a cash advance from the day the transaction was made.