Savings interest is money your bank or credit union pays you for keeping money in an account with them

When you deposit money into a savings account, the bank lends that money out to other customers as mortgages, car loans, and business loans. The bank charges those borrowers interest on those loans. The bank then shares a portion of that interest with you as a reward for letting them use your money. That payment is your savings interest.

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 in your pocket. A longer time in the account means more interest accumulates. More money in the account means the interest compounds on a larger balance.

Interest rates on savings accounts vary widely. Some banks offer rates near zero percent, while others—particularly online banks and credit unions—offer rates between 4 and 5 percent or higher. The rate your bank offers can change at any time, so the interest you earn is not fixed for life.

Key Takeaways

  • Banks pay you interest because they lend out your deposited money to other customers and share the profit with you.
  • Your earnings depend on the account balance, the interest rate offered, and how long the money stays in the account.
  • Interest rates vary by bank and change over time, so comparing rates before opening an account matters.
  • Compound interest means you earn interest on your interest, which accelerates growth the longer money sits in the account.

How interest rates are set and why they change

Banks set their own savings interest rates based on what the Federal Reserve does with its benchmark rate. When the Federal Reserve raises its rate, banks typically raise the rates they offer on savings accounts. When the Federal Reserve lowers its rate, banks usually lower savings rates too. This happens because banks adjust how much they're willing to pay depositors based on how much they can earn by lending that money out.

The rate environment also matters. During periods when the Federal Reserve keeps rates high, savings accounts offer better returns. During periods when rates are low, savings accounts earn very little. Your bank's own business strategy also plays a role—some banks compete aggressively for deposits by offering higher rates, while others keep rates low because they have enough deposits already.

You won't see your rate change mid-month or mid-year unless your bank announces a change. Most banks notify account holders when rates change, though the notification might come by email or appear in your online banking portal rather than by mail.

Simple interest versus compound interest

Simple interest means the bank calculates interest only on your original deposit. If you put $1,000 in an account earning 5 percent simple interest per year, you earn $50 in year one, $50 in year two, and $50 in year three. The interest never grows because it's always calculated on the same $1,000.

Compound interest means the bank calculates interest on your balance plus any interest you've already earned. With the same $1,000 at 5 percent compounded annually, you earn $50 in year one (on $1,000). In year two, you earn interest on $1,050, which is $52.50. In year three, you earn interest on $1,102.50, which is $55.13. The interest grows because each year's calculation includes the previous year's earnings.

Nearly all savings accounts use compound interest, not simple interest. The compounding frequency matters too—some accounts compound daily, others monthly or quarterly. Daily compounding means your interest is calculated and added to your balance every single day, which grows your money slightly faster than monthly or quarterly compounding.

Annual Percentage Yield (APY) versus interest rate

Banks advertise two different numbers: the interest rate and the Annual Percentage Yield (APY). The interest rate is the raw percentage the bank pays. The APY is the actual return you'll get after accounting for compound interest over a full year.

For example, a bank might advertise a 5 percent interest rate compounded daily. The actual APY might be 5.13 percent because of how the daily compounding adds up over the year. When you're comparing savings accounts, always look at the APY, not the interest rate, because APY tells you the real amount you'll earn.

Banks are required by law to display the APY prominently when advertising savings rates, so you should see it clearly on their website or in account materials. If you don't see an APY listed, ask the bank directly before opening an account.

How to calculate what you'll earn

You can estimate your earnings with a simple formula: multiply your account balance by the APY, then multiply by the number of years. A $5,000 balance at 4.5 percent APY for one year earns roughly $225. For two years, it earns roughly $450 (before accounting for the compounding that happens in year two, which would make it slightly more).

For a more precise calculation, use an online savings calculator—most banks provide one on their website, and many financial websites offer free calculators you can use with any bank's rates. You enter your starting balance, the APY, and how long you plan to leave the money there, and the calculator shows you the exact amount you'll have at the end.

Keep in mind that these calculations assume the rate stays the same for the entire period. If your bank changes the rate, your actual earnings will differ. Also, if you withdraw money before the end of the period, you'll earn less because the interest is calculated on a smaller balance.

Where to find the highest savings rates

Online banks and credit unions typically offer higher rates than traditional brick-and-mortar banks. Online banks have lower overhead costs because they don't maintain physical branches, so they pass some of those savings to depositors in the form of higher rates. Credit unions are member-owned, not shareholder-owned, so they often prioritize member returns over profits.

Rates change frequently, so the highest-paying account today might not be the highest-paying account next month. Before opening a savings account, check current rates on comparison websites or directly on bank websites. Look at the APY, check whether there are any monthly fees that would eat into your earnings, and confirm the account is insured by the Federal Deposit Insurance Corporation (FDIC) or the National Credit Union Administration (NCUA).

Some accounts require a minimum balance to earn the advertised rate, while others don't. Read the account terms carefully so you know what you're signing up for. A high rate doesn't matter if you can't meet the minimum balance requirement.

What reduces or eliminates your interest earnings

Monthly maintenance fees are the biggest threat to your interest earnings. If your account charges a $10 monthly fee and you're earning $5 per month in interest, the fee wipes out your earnings and costs you $5 more. Always check the fee schedule before opening an account, and look for accounts with no monthly fees.

Frequent withdrawals don't directly reduce interest, but they do reduce your balance, which means less interest accrues. If you withdraw $2,000 from a $5,000 account, you're now earning interest on $3,000 instead of $5,000, so your monthly earnings drop.

Some savings accounts have tiered rates, meaning the interest rate changes based on your balance. A bank might offer 4.5 percent on balances under $10,000 and 5 percent on balances of $10,000 or more. If your balance drops below the threshold, your rate drops too. Read the rate structure carefully so you understand how your specific balance will be treated.

Frequently Asked Questions

Is the interest I earn on savings taxable?

Yes. The interest you earn is considered income by the IRS, and you must report it on your tax return. Your bank will send you a Form 1099-INT at the end of the year showing how much interest you earned. The amount is usually small unless you have a large balance or a very high rate, but it still counts as taxable income.

Can a bank lower my interest rate without warning?

Yes. Banks can change savings rates at any time without advance notice, though most notify customers when a change happens. The rate you see when you open an account is not may provide to stay the same. If your bank lowers its rate and you're unhappy, you can move your money to a different bank offering a better rate.

What's the difference between a savings account and a money market account?

Money market accounts typically offer higher interest rates than regular savings accounts, but they often require a larger minimum balance and limit how many withdrawals you can make per month. If you need frequent access to your money, a regular savings account is usually better. If you have a larger balance and won't need to withdraw often, a money market account might earn you more.

Does keeping money in a savings account beat inflation?

It depends on the rate and the inflation rate. If inflation is 3 percent and your savings account earns 4.5 percent, you're earning a real return of about 1.5 percent. If inflation is 5 percent and your account earns 4 percent, you're losing purchasing power even though your balance is growing. Check current inflation rates and compare them to current savings rates to see whether you're staying ahead.

Why do some banks offer such low rates?

Banks that offer very low rates (under 1 percent) typically have high overhead costs from maintaining physical branches, or they have enough deposits already and don't need to compete for more. Online banks and credit unions compete harder for deposits because they need to attract customers, so they offer higher rates. Shopping around always pays.