Interest is money the bank pays you for keeping your money there

When you put money in a savings account, the bank uses that money to lend to other customers. In return, the bank pays you interest — a percentage of your balance that gets added to your account regularly. The more money you keep in the account and the longer you keep it there, the more interest you earn.

The bank decides how much interest to pay you, and that rate changes based on what the Federal Reserve does with national interest rates. When the Fed raises rates, banks typically raise the interest they pay on savings. When the Fed lowers rates, banks lower what they pay you. This means the interest rate on your account is not locked in forever — it can go up or down.

Interest usually gets added to your account monthly, though some banks add it daily or quarterly. Each time interest is added, it becomes part of your balance, and the next interest payment is calculated on that larger amount. This is called compound interest — you earn interest on your interest.

Key Takeaways

  • Banks pay you interest as a percentage of your account balance, and that rate changes when national interest rates change.
  • The interest rate your bank offers depends on the type of account and the bank itself — rates vary widely, so comparing banks matters.
  • Interest compounds, meaning each payment gets added to your balance and the next payment is calculated on the larger amount.
  • High-yield savings accounts typically pay much more interest than traditional savings accounts at the same bank.
  • You can see your interest rate and how much you earned in your account statements or online banking portal.

Where to find your current interest rate

Your bank tells you the interest rate in your account agreement — the document you received or signed when you opened the account. You can also find it in your online banking portal, usually under "Account Details" or "Account Information." If you have paper statements, the rate is often printed on the first page.

The rate shown is called the Annual Percentage Yield, or APY. This is the total amount you will earn in a year if you do not withdraw any money. For example, if your account has an APY of 0.01% and you keep $1,000 in it for a full year with no deposits or withdrawals, you would earn about 10 cents.

If you cannot find your rate online or in your statement, call your bank's customer service number or visit a branch. They can tell you your exact APY and explain whether it is a fixed rate or variable rate (one that can change).

Why interest rates differ between banks and account types

Not all banks pay the same interest rate on savings accounts. Banks that operate mostly online, with no physical branches, typically pay higher rates because they have lower costs. Banks with many branches in your town usually pay lower rates because they spend more money on buildings and staff.

The type of account also matters. A high-yield savings account pays significantly more interest than a regular savings account at the same bank — sometimes 10 to 20 times more. The tradeoff is that high-yield accounts often require a larger opening deposit or have other conditions, like a limit on how many times you can withdraw money per month.

Money market accounts and certificates of deposit (CDs) are other options that may pay higher interest, though they come with their own rules about when you can access your money. A CD locks your money away for a set time — three months, one year, five years — and pays a fixed rate for that entire period.

How to compare interest rates before opening an account

Before you open a new savings account, spend 10 minutes checking what different banks are offering. Visit the websites of banks you know, and also search for "high-yield savings accounts" to see what online banks are paying. Write down the APY, any minimum deposit required, and any fees.

A higher rate is not always the best choice if it comes with high fees or a large minimum deposit you cannot meet. A bank paying 4.5% APY with a $25,000 minimum is not useful if you only have $500 to save. A bank paying 4.0% APY with no minimum and no monthly fees might be the better choice for your situation.

Also check whether the bank is FDIC-insured. This means if the bank fails, the government protects your money up to $250,000. Nearly all banks are FDIC-insured, but it is worth confirming on the bank's website or by calling them.

What happens to your interest if you withdraw money

If you withdraw money from your savings account before the month ends, you still earn interest on the money you kept there. The interest is calculated based on your average balance for that period or your balance on a specific day — the bank's rules determine which method they use.

For example, if you keep $1,000 in your account for 20 days and then withdraw $500, you earn interest on the full $1,000 for those 20 days, then interest on the remaining $500 for the rest of the month. You do not lose the interest you already earned.

The one exception is if your account has a minimum balance requirement and you drop below it. Some accounts charge a monthly fee if your balance falls below a certain amount — say, $500. Check your account agreement to see if this applies to you.

How interest compounds over time

Compound interest is powerful because each interest payment gets added to your balance, and the next payment is calculated on that larger amount. If you never withdraw the money, it grows faster and faster.

Here is a straightforward example: if you have $1,000 in an account earning 4% APY, after one year you have $1,040. In year two, you earn 4% on $1,040, which is $41.60, leaving you with $1,081.60. In year three, you earn 4% on $1,081.60. Each year, the interest payment is slightly larger because it is calculated on a bigger balance.

The longer you leave money untouched, the more compound interest works in your favor. This is why starting to save early, even with small amounts, can make a real difference over years or decades.

When interest rates change and what you should do

Banks change the interest rates they offer when the Federal Reserve changes national rates. If the Fed raises rates, your bank may raise the rate on your savings account within days or weeks. If the Fed lowers rates, your bank will likely lower your rate too.

You do not have to do anything when your rate changes — the new rate applies automatically. However, if your bank lowers its rate and you find that other banks are paying much more, you can move your money to a different bank. There is no penalty for closing a savings account and opening one elsewhere.

Some people set a reminder to check their bank's rate once or twice a year, especially if they have a large amount saved. If your rate has dropped significantly below what other banks are offering, moving your money takes about 15 minutes and could earn you hundreds of dollars more per year.

Frequently Asked Questions

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

Yes. Interest is considered income, and you owe federal income tax on it. Your bank will send you a form called a 1099-INT at the end of the year if you earned $10 or more in interest. You report this on your tax return. Some states also tax interest income.

What is the difference between APY and APR?

APY (Annual Percentage Yield) includes compound interest — it shows what you actually earn in a year. APR (Annual Percentage Rate) does not include compounding. For savings accounts, always look at the APY, not the APR. APR is used for loans and credit cards.

Can I lose money in a savings account?

You cannot lose the money you deposit, as long as your bank is FDIC-insured. However, if inflation is high and your interest rate is low, the money's purchasing power decreases — you can buy less with it. This is not the same as losing money, but it is worth understanding.

Is there a limit to how much interest I can earn?

No limit exists on interest earned. However, some savings accounts limit how many times you can withdraw money per month — often to six withdrawals. Check your account agreement to see if this applies to you.

Should I move my money to a different bank if rates go down?

It depends on how much money you have and how much lower your rate is. If you have $10,000 and your rate drops from 4% to 2%, you are losing $200 per year. Moving to a bank paying 4% would be worth the 15 minutes of work. For smaller amounts, the difference may not be worth the effort.