Interest is money your bank pays you for letting them use your money

When you put money in a savings account, the bank doesn't just hold it in a vault with your name on it. The bank lends that money to other customers — for mortgages, car loans, business loans — and charges those borrowers interest. The bank keeps most of that interest, but shares a small piece with you as a reward for depositing your money there. That share is called interest on your savings account.

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 interest rate means you earn more. A larger balance means you earn more. Money that sits in the account longer earns more than money that moves out quickly.

Interest is real money. It gets added to your account balance, and you can withdraw it or leave it there to earn interest on top of itself.

Key Takeaways

  • Banks pay you interest because they lend out the money you deposit and keep the difference between what they pay you and what borrowers pay them.
  • Your interest earnings depend on your account balance, how long the money stays in the account, and the interest rate your bank offers.
  • Interest rates vary widely between banks and change over time, so comparing rates before opening an account can mean earning significantly more.
  • Interest is usually added monthly or daily, and you can leave it in the account to earn interest on top of interest, called compounding.

How banks decide what interest rate to offer

Banks don't set interest rates randomly. They're influenced by the federal funds rate, which is the interest rate the Federal Reserve (the central bank of the United States) sets for banks that lend to each other. When the Federal Reserve raises this rate, banks typically raise the interest they pay on savings accounts. When the Federal Reserve lowers it, banks usually lower savings account rates too.

But banks also compete with each other. A bank that offers a higher interest rate than its competitors will attract more deposits. Online banks — which have lower costs than banks with physical branches — often offer higher rates than traditional banks because they can afford to share more of their earnings with depositors.

This means the interest rate you're offered depends partly on which bank you choose. Two banks might offer very different rates on the same type of account at the same moment in time.

The difference between straightforward and compound interest

straightforward interest means the bank calculates what you've earned based only on your original deposit. If you put $1,000 in an account earning 4% straightforward interest per year, you earn $40 that year. The next year, you still earn $40 on the original $1,000 — the interest itself doesn't earn interest.

Compound interest means the bank adds the interest you've earned back into your account, and then calculates next month's interest on the new, larger balance. If you earn $40 in interest in month one, month two's interest is calculated on $1,040, not $1,000. This creates a snowball effect where your money grows faster.

Most savings accounts use compound interest, and many compound it daily or monthly. The more frequently interest compounds, the more you earn. When you're comparing savings accounts, look for accounts that compound daily rather than monthly — the difference adds up over time.

When and how interest gets added to your account

Banks don't add interest to your account every single day, even though many calculate it daily. Most commonly, interest is posted (officially added) to your account once a month, usually on the last day of the month or the first day of the next month. Some banks post interest quarterly (four times a year) or annually (once a year).

You can see how much interest you've earned by looking at your account statement. The statement shows your starting balance, any deposits and withdrawals, the interest added, and your ending balance. Online banks usually let you see this information when ready in your account dashboard.

The interest becomes part of your account balance and is yours to keep. You can withdraw it, or you can leave it there to earn interest on top of itself in the next period.

Why interest rates on savings accounts are low right now

You might notice that savings account interest rates seem small compared to what you hear about in the news. A rate of 4% or 5% might sound high until you realize that's annual — you earn that much over a full year, not per month.

Savings account rates are also lower than rates on other types of accounts because savings accounts are liquid, meaning you can withdraw your money anytime without penalty. Accounts that lock your money away for a set period — like certificates of deposit (CDs) — typically offer higher rates because the bank knows it can use your money for longer.

Interest rates also change based on the broader economy. When the Federal Reserve is trying to slow down inflation, it raises rates, and banks raise what they pay on savings. When the economy is struggling, the Federal Reserve lowers rates, and banks lower what they pay on savings.

How to find a savings account with a better interest rate

The first step is to stop assuming all banks offer the same rate. They don't. A traditional bank with branches in your town might offer 0.01% interest, while an online bank offers 4.5% on the same type of account. Over a year, that difference is enormous.

To compare rates, visit the websites of several banks and look for the savings account section. Most banks display the current interest rate (called the APY, or Annual Percentage Yield) prominently on the account details page. Write down the APY and the compounding frequency for each account you're considering.

You don't need to stay with your current bank if another bank offers a better rate. You can open a new savings account at a different bank and transfer your money. The process usually takes a few days. Some people keep savings accounts at multiple banks to take advantage of different rates or features.

What happens to your interest if you withdraw money early

If you withdraw money from a regular savings account before the end of the month, you still earn interest on the money that was there. The interest is calculated based on your balance for the time it was in the account.

This is different from CDs, which charge a penalty if you withdraw before the term ends. Savings accounts have no penalty for early withdrawal — that's part of what makes them liquid. You can move money in and out freely without losing the interest you've already earned.

Some banks calculate interest based on your minimum balance (the lowest amount you had in the account during the period), while others calculate based on your average balance. Check your account details to see which method your bank uses, because it affects how much you earn.

Frequently Asked Questions

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

Yes. Interest is income, and the IRS treats it like any other income. If you earn more than $10 in interest in a year, your bank will send you a form called a 1099-INT, and you'll report that interest on your tax return. Keep your account statements so you have a record of what you earned.

Can I lose money if the interest rate goes down?

No. The interest rate going down means you'll earn less interest on new deposits or when your rate adjusts, but you won't lose the money you already have. The principal — your original deposit — is always yours. Only the amount of new interest you earn changes.

What's the difference between APY and APR?

APY (Annual Percentage Yield) includes the effect of compounding and shows what you'll actually earn over a year. APR (Annual Percentage Rate) doesn't include compounding. For savings accounts, always look at the APY, because that's the real number that matters for what you'll earn.

Is my interest safe if the bank fails?

Yes. The FDIC (Federal Deposit Insurance Corporation) insures savings accounts up to $250,000 per depositor per bank. This means if the bank closes, the government guarantees you'll get your money and all the interest you've earned back, up to that limit.

Why do some accounts call it "dividend" instead of "interest"?

Credit unions (which are member-owned instead of shareholder-owned) often call the money they pay you "dividends" instead of "interest," but it works the same way. You earn money based on your balance, and it's added to your account regularly. The name is different, but the concept is identical.