What Is an Interest Rate?
📷 Interest rates affect every loan, mortgage, and savings account you will ever use
An interest rate is the cost of borrowing money — or the reward for saving it.
Interest rates quietly control your financial life. They decide how much your mortgage costs, how fast your savings grow, and how expensive your credit card debt is. When central banks raise or lower rates, the effect ripples into every household in the country.
You borrow $1,000
A bank lends you money, taking a risk that you'll repay it.
The bank charges 5% interest per year
That's the price of borrowing — $50 in this case.
You repay $1,050
The original amount plus the interest cost.
The bank profits from the difference
This is how banks earn money on loans and mortgages.
✅ Simple Interest
⚡ Compound Interest
James takes a $10,000 car loan at 8% annual interest. Over 5 years, he repays over $12,165 — paying $2,165 just for the privilege of borrowing. His neighbour Sarah saved and paid cash. Same car. $2,165 cheaper. That's the real cost of interest rates.
Central banks set a "base rate" that all other rates follow. When inflation is high, they raise rates to slow spending. When the economy is struggling, they cut rates to encourage borrowing and investment.
🚫 Low interest rates don't always mean good news. They're great for borrowers — but they punish savers. If your savings account pays 0.5% but inflation runs at 4%, you're losing purchasing power even while earning interest.
⚡ Quick Summary
Interest rate = the cost of borrowing or reward for saving
Affects mortgages, credit cards, loans, and savings accounts
Set by central banks and adjusted to control inflation
Even a 1–2% difference compounds into thousands over years