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

When you deposit money into a savings account, the bank uses that money to make loans to other customers. In return, the bank pays you interest — a percentage of your balance, calculated and added to your account on a schedule the bank sets. The more money you keep in the account and the higher the interest rate, the more you earn.

Interest rates vary widely depending on the bank, the type of account, and current economic conditions. A traditional bank might offer 0.01% annual interest, while an online bank might offer 4.5% or higher. The difference matters: on a $10,000 balance, 0.01% earns $1 per year, while 4.5% earns $450 per year.

Interest is usually calculated daily but paid monthly, quarterly, or annually depending on the account. Some banks compound interest, meaning they calculate interest on your interest as well as your principal balance, which increases your earnings over time.

Key Takeaways

  • Online banks typically offer higher interest rates than traditional brick-and-mortar banks because they have lower operating costs.
  • The interest rate your bank offers can change at any time, so rates that are high today may drop tomorrow.
  • Money market accounts and certificates of deposit (CDs) often pay higher interest than regular savings accounts, but may have restrictions on withdrawals.
  • Your deposits are insured up to $250,000 per account type per bank by the FDIC, so the bank's interest rate does not affect the safety of your money.

Where to find the interest rate before you open an account

Banks publish their current rates on their websites, usually on the savings account product page or in a rates table. The rate shown is the Annual Percentage Yield (APY), which includes the effect of compounding and tells you what you will actually earn in a year.

Do not confuse APY with Annual Percentage Rate (APR) — APR does not include compounding and will show a lower number. Always look for APY when comparing accounts.

You can compare rates across multiple banks using rate-tracking websites, but verify the rate on the bank's own website before opening an account, because rates change frequently and tracking sites may not update instantly. Call the bank's customer service line if you cannot find the rate online — they will tell you the current APY for any account type.

How interest is calculated and when you receive it

Banks calculate interest using your daily balance — the amount of money in your account each day. They add up all the daily balances for the month (or quarter, or year, depending on the compounding period), divide by the number of days, and apply the interest rate to that average.

Interest is typically paid monthly, but some accounts pay quarterly or annually. When interest is paid, the bank deposits it directly into your account as a credit. You can then withdraw it, leave it to earn interest on itself, or transfer it elsewhere.

Compounding happens when the bank calculates interest on your interest. If your account compounds daily, the bank adds a tiny amount of interest each day, and tomorrow's interest calculation includes today's interest. Over months and years, compounding significantly increases your earnings compared to simple interest.

Account types that earn different interest rates

A regular savings account is the most common type and usually earns the lowest interest rate — often under 0.5% at traditional banks. These accounts have no restrictions on deposits or withdrawals, so you can add or remove money whenever you need it.

A money market account typically pays higher interest than a regular savings account but may require a larger opening deposit (often $2,500 or more) and limits the number of withdrawals you can make per month. Some money market accounts also come with a debit card or checkbook.

A certificate of deposit (CD) locks your money away for a set period — usually three months to five years — in exchange for a may provide interest rate that is higher than savings accounts. If you withdraw money before the term ends, you pay a penalty, usually equal to several months of interest. CDs are useful if you know you will not need the money for a specific amount of time.

A high-yield savings account is offered by online banks and some credit unions and pays significantly more interest than traditional bank savings accounts — sometimes 4% or higher. These accounts have the same FDIC insurance and withdrawal flexibility as regular savings accounts but offer rates closer to what you would get from a CD.

Why interest rates change and how to monitor yours

Banks set their own interest rates based on the federal funds rate — the rate the Federal Reserve charges banks to borrow from each other. When the Fed raises its rate, banks usually raise the rates they offer on savings accounts. When the Fed lowers its rate, banks typically lower savings rates as well.

Economic conditions, competition between banks, and the bank's own costs also affect the rates they offer. During periods of high inflation, banks raise rates to attract deposits. During recessions, rates often fall.

You should check your bank's current rate at least once or twice a year. If your rate has dropped significantly and other banks are offering much higher rates, moving your money to a different bank may make sense. Some banks will match a competitor's rate if you ask, though this is not may provide.

How to move your money if you find a better rate elsewhere

Opening a new account at a different bank is straightforward: you provide your name, address, Social Security number, and initial deposit, either online or in person. The new bank will give you account numbers and routing information.

To move money from your old account to your new one, you can transfer it electronically using the new bank's transfer tool (most banks offer this for free) or withdraw cash and deposit it yourself. Electronic transfers usually take one to three business days.

You do not have to close your old account immediately — you can leave it open and let any remaining balance continue to earn interest, or close it once the transfer is complete. Closing an account does not hurt your credit score.

What happens to interest if your balance drops

Interest is calculated on your daily balance, so if you withdraw money, your interest earnings for that day and going forward are based on the lower balance. For example, if you have $10,000 earning 4% APY and withdraw $5,000 on the 15th of the month, you earn interest on $10,000 for the first 14 days and on $5,000 for the remaining days.

Some accounts charge a monthly fee if your balance falls below a minimum amount. These fees can erase your interest earnings, so read the account terms carefully. High-yield accounts often have no minimum balance requirement, while money market accounts frequently do.

If you are saving toward a specific goal and want to maximize interest, keeping your balance as high and stable as possible throughout the month will increase your earnings.

Frequently Asked Questions

Do I have to pay taxes on the interest I earn?

Yes. Interest income is taxable as ordinary income at your federal tax rate. Banks send you a 1099-INT form each January showing how much interest you earned the previous year. You report this on your tax return. State income tax may also apply depending on where you live.

Is my money safe if the bank fails?

Yes. The FDIC insures deposits up to $250,000 per account type per bank. If the bank fails, the FDIC will return your money, including any interest earned up to the date of failure. This protection applies to savings accounts, money market accounts, and CDs.

Can I lose money if interest rates drop?

No. Interest rates dropping means you will earn less going forward, but you will not lose the money you already have. If you have a CD, your rate is locked in for the term regardless of what happens to market rates.

What is the difference between APY and APR?

APY includes the effect of compounding and shows what you actually earn in a year. APR does not include compounding. Always use APY when comparing savings accounts, because it reflects your real earnings.

Should I move my money to a different bank if rates are higher elsewhere?

It depends on how much money you have and how much higher the rate is. Moving $1,000 from a 0.5% account to a 4% account saves you about $35 per year — worth it if the transfer is free and easy. Moving $100,000 saves you about $3,500 per year, which is definitely worth the effort.