Banks pay you interest on the money you keep in savings
When you deposit money into 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 on a set schedule, usually monthly or daily. The amount you earn depends on three things: how much money is in the account, the interest rate the bank offers, and how long the money sits there.
Interest rates on savings accounts are set by each bank and change based on what the Federal Reserve does with its benchmark rate. When the Fed raises rates, banks typically raise savings rates too. When the Fed cuts rates, savings rates fall. This means the interest you earn can go up or down over time, even if you do nothing.
Most savings accounts today earn between 0.01% and 5.35% annual interest, depending on the bank and current market conditions. Online banks tend to pay higher rates than brick-and-mortar banks because they have lower overhead costs. The difference between a 0.01% rate and a 4.5% rate is substantial — on $10,000, you'd earn $1 per year at the low end and $450 per year at the high end.
Key Takeaways
- Interest is money the bank pays you for letting them use your deposits, calculated as a percentage of your account balance.
- The interest rate varies by bank and changes when the Federal Reserve adjusts its benchmark rate.
- Interest compounds, meaning you earn interest on your interest, which accelerates growth over time.
- Banks calculate and deposit interest on different schedules — some daily, some monthly — which affects how much you actually earn.
- High-yield savings accounts at online banks typically pay 10 to 50 times more interest than traditional bank savings accounts.
How the interest rate gets calculated and added to your account
Banks use the Annual Percentage Yield (APY) to tell you how much interest you'll earn in a year. This is different from the interest rate itself because APY includes the effect of compounding — earning interest on your interest. If a bank advertises 4.5% APY, that means if you keep $10,000 in the account for a full year without touching it, you'll have $10,450 at the end.
The bank calculates interest based on your daily balance. Each day, they take the amount of money in your account, multiply it by the daily interest rate (the annual rate divided by 365), and add that tiny amount to your balance. This happens invisibly in the background. Then, depending on the bank's schedule, they either compound the interest daily (meaning tomorrow's calculation includes today's interest) or they wait until the end of the month to deposit all the accumulated interest at once.
Daily compounding is better for you because you start earning interest on your interest sooner. Over a year, the difference between daily and monthly compounding on a $10,000 balance at 4.5% APY is roughly $2 to $3 — small but real. Over decades, compounding becomes powerful: $10,000 at 4.5% APY doubles to about $20,000 in roughly 16 years without you adding another dollar.
Why interest rates change and what that means for your money
The Federal Reserve sets a target range for the federal funds rate — the interest rate banks charge each other for overnight loans. When the Fed raises this rate, banks raise the rates they pay on savings accounts. When the Fed cuts rates, savings rates fall. This happens because banks want to attract deposits when rates are high and can afford to pay less when rates are low.
Rate changes don't happen instantly. When the Fed announces a rate increase, it can take days or weeks for banks to update their savings rates. Some banks move quickly; others wait. If you're shopping for a savings account, check the current APY on the bank's website — the advertised rate is what you'll actually earn, not a promise of what you might earn later.
Your existing account rate can also change. Banks can lower the rate on your savings account at any time, though they usually give you notice. If rates drop and you want to keep earning more, you can move your money to a different bank offering a higher rate. There's no penalty for moving money out of a savings account — you can transfer it whenever you want.
The difference between savings accounts and other places to keep money
Savings accounts are not the only place that pays interest. Money market accounts, certificates of deposit (CDs), and high-yield savings accounts all pay interest, but at different rates and with different rules about when you can access your money.
| Account Type | Typical APY Range | When You Can Withdraw | Best For |
|---|---|---|---|
| Regular Savings Account | 0.01% to 0.5% | Anytime | Easy access, low balance |
| High-Yield Savings Account | 4% to 5.35% | Anytime | Maximum interest, still liquid |
| Money Market Account | 3% to 5% | Anytime, but limited transfers | Higher rate than regular savings |
| Certificate of Deposit (CD) | 4% to 5.5% | Only at maturity date | Highest rate, but money locked up |
High-yield savings accounts pay the most interest while keeping your money accessible. CDs pay slightly more but lock your money away for a set period — if you withdraw early, you pay a penalty. Regular savings accounts at traditional banks pay almost nothing because they don't need to compete for deposits.
What happens to interest if you withdraw money before the end of the month
If you withdraw money from your savings account mid-month, you still earn interest on the balance you held. Banks calculate interest based on your daily balance, so if you had $10,000 for 15 days and then withdrew $5,000, you'd earn interest on the full $10,000 for those 15 days and then on $5,000 for the remaining days of the month. There's no penalty for withdrawing — you just earn less interest because your balance is lower.
The only exception is if your account has a minimum balance requirement and you fall below it. Some banks charge a monthly fee if your balance drops below $500 or $1,000. That fee can wipe out several months of interest, so check your account agreement to see if a minimum applies to you.
How to find a savings account that pays the most interest
The highest-paying savings accounts are almost always at online banks — institutions with no physical branches. They pay higher rates because they don't have the cost of running bank buildings and employing tellers. Online banks like Marcus, Ally, and American Express Personal Savings currently offer rates between 4% and 5.35%, while traditional banks like Chase and Bank of America typically pay 0.01% to 0.05%.
To compare rates, visit each bank's website and look for the APY listed on the savings account page. The APY is the number that matters — it already includes compounding, so you can compare it directly across banks. Also check whether there's a minimum deposit to open the account and whether the bank charges monthly fees.
Moving money between banks is straightforward. You can transfer funds electronically using your account number and routing number, or you can withdraw cash and deposit it at the new bank. There's no fee for moving money out of a savings account, and you can move it back anytime if you change your mind.
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 at the end of the year if you earned $10 or more in interest. You report this on your tax return. The amount of tax you owe depends on your tax bracket — the higher your income, the higher the tax rate on the interest.
What if I move my money to a different bank — do I lose the interest I already earned?
No. Interest you've already earned stays in your account. When you transfer money out, you take that interest with you. The only interest you lose is interest you would have earned in the future at the old bank. If you move to a bank with a higher rate, you'll earn more going forward.
Can a bank change my interest rate without telling me?
Banks can lower your rate, but they must notify you first — usually by email or mail. The notice typically gives you 30 days before the change takes effect. If you don't want the lower rate, you can move your money to a different bank. Banks cannot raise your rate without permission, though they can advertise a new higher rate that applies only to new deposits or new accounts.
Is my interest may provide, or can the bank take it back?
Interest is may provide once it's deposited into your account. The bank cannot remove it. However, the rate itself is not may provide — the bank can lower the rate on future interest. Your deposits themselves are insured by the FDIC up to $250,000 per account, so even if the bank fails, you keep your money and all interest earned.
Why do some banks pay almost no interest?
Traditional banks with physical locations have higher costs and don't need to compete aggressively for deposits because customers come for convenience and branch access. Online banks have lower costs and must compete on rate to attract customers. If you're earning 0.01% at a traditional bank, you're paying for the convenience of walking into a branch — a service online banks don't offer.