Interest Rate

What is an interest rate?

An interest rate is the percentage of money charged for borrowing, or paid for saving, usually stated as a yearly rate. When you borrow, you pay interest to the lender. When you save or lend, like putting money in a savings account, the bank pays interest to you.

Key takeaways

• The same idea works in both directions: it's a cost on debt and a reward on savings.
• On loans, the fuller cost is usually shown as APR. On savings, what you earn is usually shown as APY.
• Rates can be fixed, staying the same for the life of the loan or deposit, or variable, moving with a benchmark rate.
• Small differences in rate add up over time because of compound interest.

How an interest rate works

With simple interest, you earn or pay interest only on the original amount. With compound interest, interest is added to the balance and then earns or costs interest itself. Most savings accounts and credit cards compound, while many car loans and mortgages charge interest on the remaining balance as you pay it down.

Hypothetical example on savings: You keep $10,000 in two places for one year.

• In an account paying 0.5% a year, you earn about $50.
• In an account paying 4% a year, you earn about $400.

Same money, same safety if both are insured, but a $350 difference in one year. Over several years, the gap grows as interest compounds on interest.

Hypothetical example on debt: You borrow $10,000 for one year at 6% simple interest. You'd owe $600 in interest on top of the $10,000. At 12%, you'd owe $1,200.

Interest rates across the economy rise and fall over time, so there's no single "normal" rate. Check your bank or lender for the current rate on any account, and compare offers before you commit. The compound interest calculator and savings goal calculator let you plug in real rates.

Why it matters for your Money Type

Priceless Tay uses 4 Money Types to find where your money plan should start. The interest rate matters most for the Saver, the type who holds cash tightly and hesitates to invest. Savers are often proud of a big balance, and they should be. But if that cash sits in an account paying close to nothing, inflation can shrink what it buys each year. The first fix is setting a clear "safe" cash number, like a fully funded emergency fund in a high-yield savings account, and giving the rest a job. The emergency fund calculator helps find that number.

For Spenders and Scramblers carrying credit card balances, the interest rate on debt usually matters more than the rate on savings, since card rates tend to be far higher than what savings accounts pay.

Common questions

What's the difference between an interest rate and APR?

The interest rate is the base cost of borrowing. APR adds certain fees to that cost and states it as a yearly rate, so it's usually the better number for comparing loans. On most credit cards, the two are essentially the same.

What's the difference between a fixed and variable interest rate?

A fixed rate stays the same for the term of the loan or deposit. A variable rate can change, usually because it's tied to a benchmark rate. Variable rates can start lower but may rise later.

Why do interest rates change?

Rates across the economy move with central bank policy, inflation, and market conditions. Your personal borrowing rate also depends on your credit score, the loan type, and the lender.

Should I pay off debt or save if my savings rate is lower than my debt rate?

When your debt costs more than your savings earns, paying down the debt usually saves more money. Many people still keep a small emergency cushion first so a surprise bill doesn't go back on a card. The debt vs. invest calculator can help you compare.