What is a Credit Card and How Does It Work?

Quick Answer: A credit card is a payment card that lets you borrow money from a bank (called the issuer) to make purchases. You receive a credit limit (maximum borrowing amount) and must repay what you spend each month. If you pay in full by the due date, you typically won't pay interest. Credit cards are different from debit cards because you're borrowing money, not using funds you already have.

What Is a Credit Card? (The Basics)

A credit card is a line of credit in card form. It can be a physical plastic card or a digital card stored in your phone’s wallet. When you use a credit card to buy something, you are borrowing money from the card issuer to pay the merchant.

When the billing period ends, you’ll receive a statement showing what you owe. You then pay the credit card bill back to the issuer.

This isn’t like a debit card, which pulls money directly from your bank account at the time of purchase. With a credit card, you’re using the issuer’s money first and agreeing to repay it later.

Key Credit Card Components

Every credit card has a few basic components and terms.

Here are some of the fundamental credit card components you should know:

Credit Limit

Your credit limit is the maximum amount you can borrow on the card. The card issuer sets this limit when you’re approved. It might be as low as a few hundred dollars for a starter card, or several thousand for someone with established credit.

Earna’s beginner-friendly cards offer credit limits from $500 up to $3,000, depending on your profile.

You generally cannot spend beyond your credit limit. If you try to charge more than your available credit, the transaction will be declined (or, in some cases, the issuer might allow it and charge an over-limit fee, which is best to avoid).

Interest Rate (APR)

The interest rate on a credit card, often shown as an APR (Annual Percentage Rate), is the cost of borrowing money on the card.

Most Canadian credit cards have a purchase interest rate around 19.99% per year, though rates can range higher (up to ~29.99% for certain cards).

This interest only applies if you carry a balance (meaning you don’t pay the full amount you owe by the due date). In other words, if you pay your statement balance in full each month, you won’t be charged interest on purchases.

Grace Period

A grace period is the time between your statement date and your payment due date when no interest is charged on new purchases, provided you pay your previous balance in full.

In Canada, the grace period is usually about 21 days from the date your statement is issued. During this window, you can pay off what you owe without incurring interest on those recent purchases.

If you don’t pay the full balance by the end of the grace period, you’ll pay interest on the remaining balance, and most cards don’t provide a grace period on cash advances.

Minimum Payment

The minimum payment is the smallest amount you have to pay by the due date to keep your account in good standing. It’s often either a flat dollar amount (like $10) or a small percentage of your balance (around 3% to 5%), whichever is higher. You’ll see this amount on your monthly statement.

Paying at least the minimum by the due date helps you avoid late fees and keeps your account current, but paying only the minimum isn’t a good habit long-term.

That’s because if you only pay the minimum, the rest of your balance carries over and accrues interest. It can take quite a while to pay off a large balance by making only minimum payments.

Along with owing interest on late payments, they can also hurt your credit score, so at the very least, make sure to pay that minimum on time.

How Do Credit Card Transactions Work?

You tap your card or enter your details online, and within seconds, your purchase is approved, but what magic happens in those seconds?

Behind the scenes of every swipe or tap, an electronic process checks and authorizes your transaction.

The Transaction Process (Step-by-Step) 

Here’s a step-by-step look at what happens when you use your credit card:

1. You make a purchase: You present your card (or enter your card details online) to pay.

2. Authorization request: The merchant’s system sends the transaction details to your card issuer via the card network, requesting approval.

3. Issuer approves or declines: Your card issuer’s system checks if your account is in good standing and if you have enough available credit. It then approves or declines the transaction.

4. Purchase completes: If approved, the sale goes through, and the purchase amount is added to your credit card balance (reducing your available credit).

Your Available Credit

After each transaction, your available credit updates in real time. Available credit is simply your credit limit minus your current balance.

Keep an eye on your available credit so you don’t accidentally go over your limit. Most banking apps or online accounts will show your current balance and available credit at a glance.

The Monthly Billing Cycle

Each credit card works on a billing cycle that lasts about a month. At the end of the cycle, the issuer generates your statement showing all your charges for that period and the statement balance (total you owe).

You’ll also get a payment due date (usually around 21 days after the statement date).

Paying the full statement balance by the due date means you pay no interest on those purchases (thanks to the grace period).

If you carry any balance past the due date, interest will be charged on that amount, and you’ll see the amount of interest you owe on your next statement.

Paying Your Credit Card

There are a few approaches when it comes to paying your credit card, and it’s important to understand the consequences of each:

Paying in Full (Best Practice)

Paying in full means you pay the entire statement balance by the due date. This is the best practice and habit to get into.

Why?

Because when you pay in full:

• No interest is charged

• You avoid debt

• It builds good credit history

Paying Minimum or Partial Amount

If you don’t pay the full balance, you must at least pay the minimum payment to keep your account in good standing.

Carrying a balance (any amount you don’t pay off) will accrue interest after the due date, making your purchases more expensive. The longer you take to pay off the debt, the more interest adds up.

Quick Answer: How long will it take to pay off? With just minimum payments, a $1,000 balance at 24% APR takes about 4-5 years to pay off and costs $600+ in interest. Paying in full monthly costs $0 in interest.

Credit Cards vs Debit Cards

A debit card spends money from your bank account for purchases, whereas a credit card uses money borrowed from the card issuer that you’ll repay later. Debit cards won’t affect your credit score, but using a credit card responsibly builds your credit history.

Credit cards also often come with perks like rewards or stronger fraud protection.

How Credit Cards Affect Your Credit Score

All your card activity is reported to Canada’s credit bureaus (Equifax and TransUnion), so your credit card habits influence your score.

The most impactful factors are making payments on time and keeping your balance low relative to your limit. Pay on schedule and avoid maxing out your card, and you’ll steadily build a positive credit history.

On the other hand, missing payments or carrying a very high balance (maxing out your card) can hurt your score.

Used responsibly, a credit card is one of the fastest ways to build up a good credit rating.

Unlike many starter cards, Earna’s card doesn’t require a security deposit and still reports to both major bureaus to help you build credit.

Getting Started with Your First Credit Card

Ready to take the leap into credit cards? Choose a beginner-friendly credit card with simple terms and a modest limit. Use it for small purchases at first and always pay your bill on time (paying in full is best).

Staying within your limit and budget will help you avoid debt. If you build good habits from the start, you’ll be set for success with your credit card.

Earna Feature Spotlight: Starting your credit journey? Earna makes credit cards simple and accessible. Get approved in 60 seconds with limits from $400-$3,000, no security deposit required. We report all on-time payments to Equifax and TransUnion to help you build credit. Plus, SmartPay Sync makes sure you never miss a payment. Credit cards don't have to be complicated.

Tip: You can check if you qualify for Earna in just 60 seconds – with no impact to your credit score. [Check Eligibility]

Ready for your first credit card? Earna welcomes beginners with simple terms, accessible approval, and credit-building features. Start building your credit journey today. [Button: Apply Now]

Sources:

https://www.cibc.com/en/student/credit-cards.html