Interest rates are the percentage of your loan or savings balance that you pay to a lender or receive from a bank each year

When you borrow money, the lender charges you interest as the cost of lending. When you save money in a bank account, the bank pays you interest as the cost of using your money. The interest rate is expressed as a percentage — for example, 5% or 12% — and it determines how much extra money changes hands over time.

The rate you receive or pay depends on several things: the type of account or loan, the lender's policies, how creditworthy you are, and the broader economic environment. A savings account might pay 4% annually, while a credit card might charge 18% or higher. A mortgage might be 6%, and a car loan might be 8%. The difference matters enormously over time, because interest compounds — meaning you pay interest on the interest you already owe, or earn interest on the interest you already have.

Key Takeaways

  • Interest rates are percentages charged on borrowed money or paid on savings, and they vary by loan type, your credit history, and current market conditions.
  • Higher interest rates cost you more on debt and earn you more on savings, so comparing rates before borrowing or opening an account directly affects your money.
  • Your credit score influences the rate you receive on loans and credit cards — better credit typically means lower rates.
  • Interest compounds over time, meaning the total amount you pay or earn grows faster than the rate alone suggests.
  • The Federal Reserve influences broad interest rates in the economy, but individual lenders set their own rates within that environment.

How interest rates work on loans and credit cards

When you borrow money, you repay the original amount plus interest. If you borrow $10,000 at 6% annual interest, you owe $600 in interest over one year — though the actual amount depends on how the lender calculates it and how quickly you repay.

Credit cards typically charge much higher rates than other loans. Card companies often charge between 15% and 25% annually, depending on your credit score and the card issuer's policies. This means if you carry a $5,000 balance on a card charging 20%, you owe roughly $1,000 in interest over a year if you make no payments. That interest gets added to your balance, so next month you owe interest on the higher amount — this is compounding, and it is why credit card debt grows quickly.

Mortgages and car loans charge lower rates because the lender holds collateral — your house or car — which reduces their risk. These rates vary by lender, your credit score, and how long you borrow for. A 30-year mortgage might be 6.5%, while a 15-year mortgage from the same lender might be 6.0%, because you are repaying faster.

How interest rates work on savings accounts and certificates of deposit

Banks pay you interest on money you deposit in savings accounts, money market accounts, and certificates of deposit (CDs). The rate you receive is usually much lower than the rate you pay on debt — currently, high-yield savings accounts pay around 4% to 5% annually, while traditional savings accounts at large banks often pay less than 1%.

CDs lock your money away for a set period — three months, one year, five years — in exchange for a higher rate. If you withdraw early, you typically pay a penalty. A one-year CD might pay 4.5%, while a five-year CD might pay 5.0%, because the bank has your money for longer and can lend it out for longer.

Interest on savings also compounds. If you deposit $10,000 in a savings account paying 4% annually and leave it untouched, after one year you have $10,400. After two years, you earn 4% on $10,400, not just the original $10,000, so you have $10,816. Over decades, this compounding effect becomes substantial.

Why interest rates differ between lenders and loan types

The same person can receive different rates from different lenders for the same type of loan. A mortgage from Bank A might be 6.2%, while Bank B offers 6.0% for identical terms. This happens because lenders have different costs, different risk assessments, and different business strategies.

Your credit score is one of the largest factors. If your score is 750 or higher, you might receive a mortgage rate of 5.8%. If your score is 650, the same lender might offer 7.2%. The difference reflects the lender's view of how likely you are to repay. Over a 30-year mortgage, this difference costs tens of thousands of dollars.

Loan type also matters. Secured loans — where you pledge collateral like a house or car — carry lower rates because the lender can seize the asset if you do not pay. Unsecured loans like personal loans or credit cards carry higher rates because the lender has no collateral to recover.

How the Federal Reserve influences interest rates

The Federal Reserve, the central bank of the United States, sets a target range for the federal funds rate — the interest rate at which banks lend to each other overnight. This rate influences, but does not directly set, the rates you see as a consumer.

When the Fed raises its target rate, banks typically raise the rates they charge on loans and credit cards, and they may also raise rates on savings accounts. When the Fed lowers its target rate, the opposite usually happens. The Fed makes these moves to influence inflation and employment — raising rates to cool down a fast-growing economy, lowering rates to encourage borrowing during a slowdown.

However, individual lenders do not move in lockstep with the Fed. A bank might raise mortgage rates before the Fed acts, or hold rates steady even after the Fed moves. Shopping around for the best rate remains important regardless of what the Fed does.

How to compare interest rates before borrowing or saving

Before you take out a loan, contact at least three lenders and ask for their rates on the exact loan you need. For mortgages, get a loan estimate from each lender — a document that shows the interest rate, the annual percentage rate (APR), the loan amount, and the total interest you will pay over the life of the loan. The APR is often higher than the stated interest rate because it includes fees the lender charges.

For savings accounts, compare the annual percentage yield (APY) across banks. APY accounts for compounding, so it shows the true amount you will earn. A savings account at an online bank might pay 4.8% APY, while a savings account at a traditional bank pays 0.01% APY — the difference is real and worth the few minutes it takes to open an account elsewhere.

For credit cards, the interest rate is called the purchase APR. If you plan to carry a balance, a card with a 16% APR costs you significantly less than one with a 24% APR. If you always pay your balance in full, the APR matters less, but the card's rewards and fees matter more.

What happens when interest rates rise or fall

When interest rates rise, borrowing becomes more expensive. A mortgage that costs $1,200 per month at 5% might cost $1,400 per month at 7% for the same house. This is why home sales often slow when rates climb — people cannot afford the monthly payment on the same budget.

Rising rates also help savers. If you have money in a savings account, a higher rate means your balance grows faster without you doing anything. CDs become more attractive because the rates climb. However, if you already locked in a low rate on a CD, you are stuck with it until the CD matures.

Falling rates help borrowers but hurt savers. If you are planning to buy a house, falling rates mean lower monthly payments. If you already have savings, falling rates mean your money earns less interest going forward. This is why some people move savings into CDs when rates are high — they lock in the rate before it falls.

Frequently Asked Questions

What is the difference between APR and interest rate?

The interest rate is the percentage charged on the loan itself. The APR (annual percentage rate) includes the interest rate plus fees the lender charges, such as origination fees or closing costs. APR is usually higher than the stated interest rate and gives a more complete picture of what the loan actually costs.

Why do credit cards charge so much higher interest than mortgages?

Credit cards are unsecured debt — the lender has no collateral if you do not pay. Mortgages are secured by your house, so the lender can foreclose if you default. The higher risk on credit cards justifies the higher rate. Credit cards also allow you to borrow repeatedly and carry a balance month to month, which increases the lender's risk.

Can I negotiate my interest rate with a lender?

On mortgages and car loans, yes — lenders often have some flexibility, especially if you have good credit or are willing to pay points (an upfront fee to lower the rate). On credit cards, you can call and ask for a lower rate, and some issuers will reduce it if you have been a good customer. On personal loans, rates are usually fixed, but shopping around means you are negotiating by choosing the best offer.

How does my credit score affect the interest rate I receive?

Lenders use your credit score to assess risk. A higher score (typically 740 or above) signals that you have paid bills on time and managed debt responsibly, so lenders offer lower rates. A lower score (below 620) signals higher risk, so rates are higher. The difference can be 2% or more on a mortgage, which adds up to tens of thousands of dollars over the loan term.

Should I pay off debt or save money when interest rates are high?

If you carry high-interest debt like credit cards, paying it off usually makes more financial sense than saving. Credit card interest at 20% costs you far more than a savings account earning 4% saves you. However, if you have an emergency fund, build that first — then focus on debt payoff while also saving for retirement.