A Beginner’s Guide to Credit Card Interest

Credit Card Boot Camp: What you Should Know About Interest Rates

Welcome to Credit Card Bootcamp. Think of this as your crash course in understanding one of the most important parts of being a credit card account holder: interest. By the end of this beginner’s guide you’ll know what the typical rates and fees are, how credit card interest works, how it’s calculated, and how to keep it from costing you.

Exercise #1: What is a Credit Card?

A credit card is a financial tool that lets you borrow money from a lender to make purchases and pay for them later. If you don’t pay the total amount of these purchases back in full at this later date, you will be charged interest by the lender.

Exercise #2: How Does Interest on Credit Cards Work?

Credit card interest is the cost you pay when you don’t clear your account balance in full each month. This cost is usually shown as an annual percentage rate (APR) which represents how much the cost of borrowing will be over the course of a year. Typically this percentage ranges between 19% to 24%.

Exercise #3: How Interest is Calculated on Credit Card Purchases

Interest is calculated daily using the Average Daily Balance method. Here’s how it works:

1. The annual percentage rate (APR) is divided by 365 days to determine the daily rate. For example, a 20% APR ÷ 365 days = 0.055% interest per day.
2. The daily rate is applied to your balance owing at the end of each day.
3. Over the course of the billing cycle, those daily charges are added up, and that’s the interest dollar amount you’ll see on your next month’s statement.

Example

• $1,000 balance at a 20% APR = about $0.55 in interest per day.
• Over a 30-day cycle, that equals $16.50 in interest.

Exercise #4: How Interest is Calculated on Credit Card Cash Advances

A cash advance is when you use your credit card to withdraw cash, either from an ATM or at a bank branch. Instead of buying something directly, you’re borrowing cash against your credit card limit. It can be convenient in a pinch, but it usually comes with extra costs: a higher interest rate, no grace period, and often a fee for the transaction itself.

Unlike regular purchases, interest on a cash advance starts the moment you take the money out. There’s no “pay later” window, and the APR is often higher.

Example:

• A $200 cash advance at a 24% APR = about $0.13 per day in interest.
• After 30 days, you’d owe around $4 in interest, plus a typical fee of 3%-5% (in this case, $6-$10)

Exercise #5: What Happens If You Only Make The Minimum Payment?

Credit card statements always include a minimum payment option, usually 2-3% of the balance. While making the minimum keeps your account in good standing, it can stretch repayment out for years and lead to an interest cost that is significantly higher because it compounds.

Example:

• $1,000 balance at 20% APR.
• Minimum payment = $25.
• If you only pay the minimum, it could take 5+ years to clear the debt and cost more than $500 in interest.
• Pay $100 each month instead? You’d be debt-free in about a year with a cost of less than $120 in interest.

Exercise #6: What is “Compound Interest” And Why Does it Turbo Charge Debt?

When you have unpaid interest on your credit card account it gets added to you account balance. The next day, the daily interest that you owe is calculated based on this new, higher balance total. This is how interest compounds.

Example:

• You make a $2,000 purchase at 20% APR but only make the minimum required payment each month.
• After a year, you could still owe more than $1,800 — and you’ll have paid over $400 in interest.

Credit Card Interest Prevention: 4 Tactics to Deploy

Here are a few smart habits you can follow that will allow you to have a credit card without the fear of incurring credit card interest.

• Pay in full whenever possible. Treat your card as a convenient tool, not a loan.
• Avoid fees. Pay on time and skip cash advance unless absolutely necessary.
• Budget with you card. Never charge more to you credit card than you can pay off in a month.
• Stay alert. Review your credit card statement to catch interest charge and know where your money is going.

Conclusion

A credit card is convenient financial tool to have in your wallet or purse. With you newfound understanding of how credit card interest works and by following the fundamentals of credit card management, you can avoid incurring interest charges and the perils of compounding interest.

Operating a business? OTT Pay’s Smart POS Terminal accepts major credit cards, Learn how it can help new sales and streamline your operations.