Interest is how a savings account makes money for you
A savings account makes money through interest—a percentage of your balance that the bank pays you regularly, usually monthly or daily. The bank lends out the money you deposit to other customers as mortgages, car loans, and business credit. They keep the difference between what they pay you and what borrowers pay them. You earn money straightforward by keeping your balance in the account.
The amount you earn depends on three things: how much money sits in the account, how long it stays there, and the interest rate the bank offers. A $5,000 balance at 4.5% annual interest earns roughly $225 per year. The same balance at 0.01% earns 50 cents. The difference between a high-yield account and a standard account can be hundreds of dollars per year on the same deposit.
Interest compounds, meaning you earn interest on your interest. If you deposit $10,000 at 4% annual interest compounded monthly, after one month you have $10,033.33. The next month, you earn interest on $10,033.33, not just the original $10,000. Over years, this compounds into real money.
Key Takeaways
- Banks pay you interest on savings account balances because they lend out your money to other customers and keep the profit difference.
- Interest rates vary widely—from 0.01% at traditional banks to 4% or higher at online banks—so comparing rates before opening an account matters.
- High-yield savings accounts at online banks typically offer the highest rates because they have lower overhead costs than brick-and-mortar branches.
- Interest compounds monthly or daily, meaning you earn returns on your returns, which accelerates growth over time.
- The Federal Reserve's interest rate decisions affect what banks offer, so rates rise and fall over months and years.
How interest rates are set and why they change
Banks do not decide interest rates in a vacuum. The Federal Reserve—the central bank of the United States—sets a target range for the federal funds rate, which is the rate banks charge each other for overnight loans. When the Fed raises this rate, banks raise the rates they offer on savings accounts. When the Fed lowers it, savings rates fall.
The Fed adjusts its rate based on inflation and economic conditions. When inflation is high, the Fed raises rates to cool spending and borrowing. When the economy slows, the Fed lowers rates to encourage borrowing and spending. These decisions ripple through the entire banking system within weeks or months.
Individual banks also compete for deposits. A bank with plenty of customer deposits may offer lower rates because it does not need more money. A bank that needs deposits to lend out may offer higher rates to attract new accounts. This is why online banks often offer higher rates than traditional banks—they have fewer physical branches and lower costs, so they can afford to pay more.
The difference between standard and high-yield savings accounts
A standard savings account at a traditional bank typically offers rates between 0.01% and 0.5% annually. A high-yield savings account (HYSA) at an online bank typically offers 4% to 5% or higher. On a $10,000 balance, the standard account earns $1 to $50 per year. The high-yield account earns $400 to $500 per year. The difference compounds over time.
High-yield accounts have the same protections as standard accounts. The Federal Deposit Insurance Corporation (FDIC) insures deposits up to $250,000 at each bank, whether the rate is 0.01% or 5%. You can withdraw money from a high-yield account whenever you want, just like a standard account. The main trade-off is that high-yield accounts are usually online-only, so you cannot walk into a branch to deposit cash or speak to a teller in person.
Some high-yield accounts have minimum balance requirements—$500, $1,000, or more—to earn the advertised rate. Others have no minimum. Read the account terms before opening to understand what balance you need to maintain and whether the rate applies to every dollar or only balances above a certain threshold.
How much you can realistically earn
The amount you earn depends on your balance and how long you keep the money in the account. Here is what $10,000 earns over one year at different rates, assuming interest compounds monthly:
| Annual Interest Rate | Annual Earnings on $10,000 | Monthly Earnings (Average) |
|---|---|---|
| 0.01% | $1 | $0.08 |
| 0.5% | $50 | $4.17 |
| 2% | $202 | $16.83 |
| 4% | $408 | $34 |
| 5% | $512 | $42.67 |
These numbers assume you do not add or withdraw money during the year. If you deposit $500 monthly into a high-yield account at 4.5%, you earn more each month as your balance grows. After 12 months of $500 deposits, your balance is roughly $6,000 and you have earned about $135 in interest.
Savings account interest is not a path to wealth, but it is real money for doing nothing. A $50,000 balance at 4.5% earns $2,250 per year. That is a meaningful return on money you were going to keep safe anyway.
Why you should compare rates before opening an account
Banks change their rates frequently, sometimes weekly. When you are ready to open an account, spend 10 minutes comparing rates across three to five banks. The difference between 0.5% and 4.5% on a $20,000 balance is $800 per year—money that stays in your pocket instead of the bank's.
Use a rate comparison site like Bankrate, DepositAccounts, or NerdWallet to see current rates across banks. These sites update daily and let you filter by minimum balance, account type, and FDIC insurance. Read the fine print: some banks advertise a high rate but explore it only to balances above $100,000, or they offer the rate for three months and then drop it.
Once you open an account, monitor the rate quarterly. If your bank drops its rate and competitors offer higher rates, moving your money to a new bank takes 10 minutes. Banks know this, so they compete harder for deposits when rates are rising. You do not have to stay with a bank that stops paying competitively.
Certificates of Deposit as an alternative to savings accounts
A Certificate of Deposit (CD) is a different product that often pays more interest than a savings account. You deposit money for a fixed period—three months, six months, one year, five years—and the bank pays you a set interest rate for that entire period. If you withdraw the money early, you pay a penalty, usually a few months of interest.
CDs typically pay 0.5% to 1% higher than savings accounts at the same bank. A one-year CD might pay 5.5% while a savings account pays 4.5%. The trade-off is that your money is locked up. If you need the cash before the CD matures, you lose some of the interest you earned.
CDs make sense if you have money you know you will not need for a specific period. A savings account makes sense if you want to keep your money accessible while still earning interest. Both are FDIC insured up to $250,000.
How inflation affects what your savings account actually earns
Inflation is the rate at which prices rise. If inflation is 3% per year and your savings account earns 2%, your money is losing purchasing power—it buys less stuff even though the dollar amount grew. This is called a negative real return.
When inflation is high, you need a savings account rate that meets or exceeds inflation to keep your money's value steady. In 2023 and 2024, inflation was around 3% to 4%, and high-yield savings accounts offered 4% to 5%, so savers were actually gaining purchasing power. In other years, when inflation is low and savings rates are high, savers gain even more.
This is why comparing rates matters. A 0.01% savings account loses money to inflation almost every year. A 4.5% account keeps pace with inflation and builds real wealth.
Frequently Asked Questions
Do I have to pay taxes on savings account interest?
Yes. Interest earned on a savings account is taxable income. Banks send you a 1099-INT form each January if you earned $10 or more in interest during the year. You report this on your tax return. The tax rate depends on your overall income and tax bracket. Interest from a $10,000 balance earning $400 per year adds $400 to your taxable income.
What happens to my interest rate if the Fed raises or lowers rates?
Banks usually adjust savings rates within days or weeks of a Fed rate change, but they are not required to match it exactly. When the Fed raises rates, banks raise savings rates to compete for deposits. When the Fed lowers rates, banks lower savings rates more slowly because they want to keep deposits. Your rate can change at any time unless you have a CD with a locked-in rate.
Can I earn interest on multiple savings accounts at the same bank?
Yes, but FDIC insurance covers only $250,000 per depositor per bank, across all accounts at that bank combined. If you have $200,000 in one savings account and $100,000 in another at the same bank, only $250,000 is insured. The extra $50,000 has no protection if the bank fails. To keep all your money insured, spread deposits across different banks.
Is a savings account better than keeping money in a checking account?
For money you do not spend regularly, yes. Checking accounts earn little to no interest. Savings accounts earn interest and are designed for money you keep long-term. Move money you do not need when ready from checking to savings to earn interest on it.
What if I need to withdraw money before earning a full year of interest?
Interest accrues daily or monthly depending on the bank, so you earn interest for however long the money sits in the account. If you deposit $5,000 and withdraw it after three months, you earn three months of interest, not zero. There is no penalty for withdrawing from a savings account, unlike a CD.