What a bank interest rate is

A bank interest rate is the percentage of your money that a bank charges you to borrow, or pays you to keep your money with them. When you take out a loan, the bank charges you interest — that is the cost of borrowing. When you put money in a savings account, the bank pays you interest — that is what they give you for letting them use your money.

The rate is always shown as a percentage per year. If a bank offers 4.5% APY on a savings account and you deposit $1,000, you earn roughly $45 in a year (before taxes). If you borrow $10,000 at 8% interest on a personal loan, you pay roughly $800 in interest over a year, on top of paying back the $10,000 itself.

Interest rates move constantly. They change based on what the Federal Reserve does, what the economy is doing, and what each individual bank decides. A rate that was true last month may not be true today, and different banks offer different rates even on the same product.

Key Takeaways

  • Banks charge you interest when you borrow money and pay you interest when you save money; the rate is always shown as a yearly percentage.
  • The same type of account or loan can have different rates at different banks, so comparing before you commit matters.
  • Your personal credit score, the amount you borrow, and how long you borrow for all affect what rate a bank will offer you.
  • Interest rates set by the Federal Reserve influence what banks charge and pay, but each bank sets its own rates within that environment.

How banks decide what rate to charge you

Banks do not all charge the same rate. Three main things determine what rate you get: the prime rate (set by the Federal Reserve), your credit score, and the type and length of the loan.

The Federal Reserve sets a target range for the prime rate — the rate banks charge their most creditworthy customers. When the Fed raises or lowers this rate, banks usually raise or lower their rates too. But a bank will not offer you the prime rate unless you have excellent credit. If your credit score is lower, the bank adds extra percentage points on top of the prime rate to cover the risk that you might not pay back the loan. Someone with a 750 credit score might get 6% on a personal loan, while someone with a 620 score might get 12% on the same loan from the same bank.

The length of the loan also changes the rate. A 15-year mortgage usually has a lower rate than a 30-year mortgage, because the bank gets its money back faster. A credit card, which has no set payoff date, usually carries a much higher rate than a car loan, which has a fixed end date.

The difference between interest rates and APY

APY (Annual Percentage Yield) includes both the interest rate and how often the bank compounds the interest — meaning how often it adds the interest you earned back into your account so you earn interest on that interest too. A savings account might have a 4.5% interest rate, but if the bank compounds daily, the APY will be slightly higher, maybe 4.60%.

For savings accounts and money market accounts, APY is what matters because compounding works in your favor. For loans, banks usually quote you the APR (Annual Percentage Rate), which includes the interest rate plus fees the lender charges. A car loan might have a 6% interest rate but a 6.2% APR because the lender added in origination fees.

When you are comparing savings accounts, look at the APY. When you are comparing loans, look at the APR. Both numbers tell you the true yearly cost or earning.

Fixed rates versus variable rates

A fixed rate stays the same for the entire life of the loan or account. If you lock in a 6% mortgage rate, you pay 6% for all 30 years, no matter what happens to the economy or the Fed's rates. This makes your payment predictable and protects you if rates rise.

A variable rate changes over time, usually tied to the prime rate or another benchmark. If the Fed raises rates, your variable rate goes up too, and so does your payment. Credit cards almost always have variable rates. Some adjustable-rate mortgages (ARMs) start with a fixed rate for a few years, then switch to variable. Variable rates often start lower than fixed rates, which can look attractive, but your payment can jump if rates rise.

For loans, fixed rates protect you from payment shock. For savings accounts, variable rates can work in your favor if rates are rising, because your earnings go up. Right now, many high-yield savings accounts have variable rates, so your APY can increase if the Fed keeps rates high.

How interest rates affect what you pay or earn

On a loan, a higher interest rate means you pay more money total. Borrow $200,000 at 5% over 30 years and you pay roughly $186,000 in interest. Borrow the same amount at 7% and you pay roughly $279,000 in interest — nearly $100,000 more. Even a 1% difference adds up fast on large loans or long terms.

On savings, a higher interest rate means you earn more. Keep $10,000 in a savings account at 0.01% APY and you earn $1 per year. Keep it in a high-yield savings account at 4.5% APY and you earn $450 per year. Over five years, that is $2,250 in extra earnings just from choosing a higher rate.

This is why shopping around matters. Spending an hour comparing mortgage rates across five banks can save you tens of thousands of dollars. Comparing savings account rates can double or triple what you earn on the same money.

When and why interest rates change

The Federal Reserve raises or lowers the prime rate based on inflation and the health of the economy. When inflation is high, the Fed raises rates to make borrowing more expensive and slow down spending. When the economy is weak, the Fed lowers rates to make borrowing cheaper and encourage spending. Banks follow these moves because they borrow money from each other at the prime rate.

Individual banks also change their rates based on how much money they have on hand and how much they want to lend. If a bank has too much money sitting idle, it might raise the rate on savings accounts to attract more deposits. If a bank needs to lend more money, it might lower rates on loans to attract borrowers.

Economic news, inflation reports, and Fed announcements all move rates. You might see rates change weekly or even daily on some products. This is why the rate you see today might not be the rate you get if you apply next week.

How to find the best rate for your situation

For loans, get quotes from at least three lenders before you commit. Each lender will run a credit check and give you a rate based on your actual credit score and income. These quotes are usually free and do not lock you in. Compare the APR, not just the interest rate, because APR includes fees.

For savings accounts, use a rate comparison website or call banks directly. Online banks almost always offer higher rates than brick-and-mortar banks because they have lower overhead. A high-yield savings account at an online bank might pay 4.5% APY while a traditional bank pays 0.01% on the same type of account.

Check the rate again right before you open the account or sign loan papers, because rates can change between the time you get a quote and the time you apply. Ask the lender whether the rate is locked in or whether it can change before closing.

Frequently Asked Questions

Why do different banks offer different rates on the same product?

Banks set their own rates based on how much money they have, how much they want to lend, and their operating costs. Online banks usually offer higher savings rates because they have no physical branches. Banks also use rates to compete for customers — one bank might lower mortgage rates to attract borrowers while another raises savings rates to attract deposits.

Can I negotiate my interest rate with a bank?

On loans, you can sometimes negotiate, especially if you have good credit or a long relationship with the bank. On savings accounts, no — the rate is set by the bank and applies to everyone. You negotiate by choosing a different bank that offers a better rate.

What does it mean when the Fed raises or lowers rates?

The Federal Reserve raises the prime rate to make borrowing more expensive and slow inflation. It lowers the prime rate to make borrowing cheaper and stimulate the economy. Banks usually raise or lower their rates within days or weeks of a Fed move, so your savings rate might go up or your loan rate might go down depending on which direction the Fed moved.

How much does my credit score affect the interest rate I get?

Credit score can change your rate by several percentage points. Someone with a 750+ score might get 5% on a personal loan while someone with a 620 score gets 12% on the same loan. The difference adds up to thousands of dollars over the life of the loan, so improving your credit before you borrow can save real money.

Is a variable rate ever better than a fixed rate?

Variable rates start lower and can save you money if rates fall or stay flat. But if rates rise, your payment goes up and you have no protection. Variable rates work best if you plan to pay off the loan quickly or if you can afford a higher payment if rates rise. For most people, a fixed rate is safer because the payment never changes.