Interest is money your bank pays you for keeping money in your account

When you deposit money into a savings account, the bank lends that money to other customers through mortgages, car loans, and business loans. In exchange for the right to use your money, the bank pays you interest—a percentage of your balance that gets added to your account on a regular schedule, usually monthly or daily.

The amount you earn depends on three things: how much money you have in the account, how long it stays there, and the interest rate the bank offers. A higher rate means more money paid to you. A larger balance means more interest on that balance. Time matters because interest often compounds—meaning you earn interest on your interest.

Interest rates on savings accounts are set by each bank and change based on what the Federal Reserve does with its benchmark rate. When the Fed raises rates, banks typically raise savings rates. When the Fed cuts rates, savings rates fall. You can shop around—different banks offer different rates, and some online banks offer significantly higher rates than traditional brick-and-mortar banks.

Key Takeaways

  • Interest is payment from your bank for letting them use your deposited money, expressed as a percentage of your balance.
  • The amount you earn depends on your account balance, the interest rate offered, and how long your money stays in the account.
  • Interest rates vary by bank and change when the Federal Reserve adjusts its benchmark rate.
  • Compound interest means you earn interest on your previous interest, which grows your balance faster over time.
  • Online banks and credit unions often offer higher rates than traditional banks, so comparing options matters.

How the interest rate is expressed and calculated

Banks state their savings rates as an Annual Percentage Yield (APY). This is the total percentage of your balance you will earn in one year, including the effect of compounding. For example, if a bank offers 4.50% APY and you have $10,000 in the account, you will earn approximately $450 over one year (though the actual amount is slightly higher because of daily compounding).

The bank calculates interest daily but usually deposits it into your account monthly. Each day, the bank takes your current balance, divides the annual rate by 365, and adds that amount to your account. This daily calculation is why the actual interest you earn is slightly more than a straightforward multiplication—you earn interest on the interest that was already added.

Some older accounts still use Annual Percentage Rate (APR), which does not include compounding. APY is always higher than APR on the same account, so when comparing banks, make sure you are looking at APY figures.

Why interest rates change and what affects them

The Federal Reserve sets a target range for the federal funds rate—the rate banks charge each other for overnight loans. When the Fed raises this rate, banks raise the interest they pay on savings accounts. When the Fed cuts the rate, savings rates fall. This is why your savings rate might change several times a year even though you have done nothing different.

Banks also set rates based on competition. If many banks in your area offer 4.75% APY, a bank offering 3.50% will lose customers. Online banks, which have lower overhead costs than physical branches, often offer higher rates because they can afford to. Credit unions, which are member-owned rather than profit-driven, sometimes offer competitive rates as well.

Economic conditions matter too. During periods of high inflation, the Fed raises rates to cool spending, and savings rates rise. During recessions, the Fed cuts rates to encourage borrowing, and savings rates fall. This means the best time to lock in a high rate is when the Fed is in a tightening cycle—but rates can change, so there is no perfect moment to move money.

The difference between straightforward and compound interest

straightforward interest means you earn interest only on your original deposit. If you put $5,000 in an account earning 5% straightforward interest, you earn $250 per year, every year, for a total of $5,250 after one year.

Compound interest means you earn interest on your balance plus all the interest that has already been added. Using the same $5,000 at 5% APY compounded daily, after one year you would have approximately $5,256.58. The extra $6.58 came from earning interest on the interest that was added throughout the year. Over longer periods, this difference grows significantly. After 10 years at 5% APY, compound interest adds hundreds of dollars compared to straightforward interest.

All savings accounts use compound interest, and most compound daily. The more frequently interest compounds, the more you earn—daily compounding beats monthly compounding, which beats annual compounding. However, the difference between daily and monthly compounding on a savings account is usually small unless your balance is very large.

What happens to interest if you withdraw money

Interest is calculated on your balance at the time the interest is posted. If you have $10,000 on the day interest is calculated and withdraw $5,000 the next day, you still earn interest on the full $10,000 for that period. However, the next interest calculation will be based on your new $5,000 balance.

Some savings accounts have minimum balance requirements. If your balance falls below the minimum, the bank may stop paying interest or charge a monthly fee. Check your account agreement to see if your account has this rule. High-yield savings accounts typically have no minimum balance requirement, though some require $1 to open.

Frequent withdrawals do not reduce the interest you have already earned, but they do reduce the balance that future interest is calculated on. If you need to withdraw money regularly, you will earn less total interest than if you kept the money in the account.

How interest compares across different account types

Regular savings accounts at traditional banks typically offer 0.01% to 0.50% APY. These accounts are convenient but pay very little. High-yield savings accounts, usually offered by online banks, currently offer 4.00% to 5.35% APY depending on the bank and current market conditions. The difference between a regular savings account and a high-yield account can mean hundreds of dollars per year on the same balance.

Money market accounts are hybrid accounts that combine features of savings and checking accounts. They often offer interest rates between regular savings and high-yield savings, typically 3.50% to 5.00% APY. However, they usually require a higher minimum balance and limit how many withdrawals you can make per month.

Certificates of Deposit (CDs) lock your money away for a set period—three months, one year, five years—in exchange for a higher interest rate. A one-year CD might offer 5.25% APY while a high-yield savings account offers 5.00%. The tradeoff is that you cannot access your money without paying an early withdrawal penalty. CDs make sense if you know you will not need the money for a specific period.

How to find the best interest rate for your situation

Start by checking what your current bank offers. Log into your account or call the customer service number on your statement. Many people discover their bank pays 0.01% APY and have never checked because the interest is so small it does not appear on their statement.

Compare rates across at least three to five banks. Websites like Bankrate, DepositAccounts, and the Federal Deposit Insurance Corporation (FDIC) website list current rates at major banks. Online banks almost always offer higher rates than traditional banks. Credit unions sometimes offer competitive rates—check if you are a member or if you can join through your employer or community.

Consider whether you need to access your money frequently. If you do, a high-yield savings account with no withdrawal limits makes sense. If you have money you will not need for six months or longer, a CD might earn you more. If you have a very large balance, some banks offer tiered rates—higher rates on balances above certain thresholds.

Moving money to a higher-rate account takes about three to five business days. There is no penalty for switching banks, and the interest difference can be substantial. A $50,000 balance earning 0.01% at your current bank earns $5 per year. The same balance at 5.00% APY earns $2,500 per year—a difference of $2,495.

Frequently Asked Questions

Is the interest I earn on a savings account taxed?

Yes. Interest income is taxable as ordinary income on your federal and state tax returns. Banks send you a 1099-INT form in January if you earned $10 or more in interest during the previous year. You report this on your tax return. The higher your interest rate and balance, the more tax you may owe on the interest earned.

Can I lose money in a savings account?

Your principal—the money you deposited—is protected by FDIC insurance up to $250,000 per bank per account type. You cannot lose your deposit. However, if inflation is higher than your interest rate, the purchasing power of your money decreases over time. If you earn 2% interest but inflation is 4%, your money is effectively losing value.

What happens to my interest if the bank fails?

The FDIC insures deposits up to $250,000, including any interest that has been added to your account. If a bank fails, the FDIC transfers your account to another bank or pays you directly. Your interest earnings are protected the same way your principal is.

How often should I check my interest rate?

Check your rate at least once or twice per year, especially if the Federal Reserve has changed rates. If your rate drops significantly below what other banks offer, moving your money takes a few days and can earn you hundreds of dollars more per year. There is no cost to switching.

Do I need a certain amount of money to earn interest?

Most high-yield savings accounts have no minimum balance requirement and pay interest on every dollar, even if you only have $1 in the account. Some traditional banks require a minimum balance to earn interest or to avoid monthly fees. Check your account agreement or ask your bank directly.