Understanding Interest

Interest is the cost of borrowing money — and it’s the #1 reason debt becomes expensive. Understanding how interest works helps you avoid traps and pay off debt faster.

What Is Interest?

Interest is a fee charged by lenders for letting you borrow money. It’s calculated as a percentage of what you owe, and it grows every month you carry a balance.

APR = yearly interest rate
Interest charges = added to your balance monthly
Higher APR = more expensive debt

Even small APR differences can add up to thousands of dollars over time.

How Interest Is Calculated

Credit cards typically use daily compound interest, meaning:

Your balance is multiplied by a daily interest rate
The new balance includes yesterday’s interest
This repeats every day of the month

Loans usually use simple interest, which is easier to track. But credit cards? They grow extremely fast.

Example: Credit Card Interest

If you have a $2,000 balance at 22% APR:

22% APR → 0.06027% interest per day
Daily interest: about $1.20/day
Monthly interest: about $36

That’s $432 per year in interest — just for carrying the balance.

Why High Interest Debt Is Dangerous

You can pay for years without reducing your balance
Interest grows faster than your payments
Minimum payments barely make progress
Balances can snowball out of control

This is why strategies like Avalanche or balance transfers are so powerful.

How to Reduce the Interest You Pay

Focus on high-interest debts first (Avalanche Method)
Use balance transfers to 0% APR cards
Make payments early in the billing cycle
Make more than one payment per month
Refinance loans when possible

Even a small rate reduction can save you major money.