Your money grows through interest, but the amount depends on the rate your bank offers and how long you leave it there
Yes, money in a savings account grows—but not by itself. A bank pays you interest, which is a percentage of your balance. The bank uses your money to lend to other customers and make investments, and it shares a small portion of what it earns with you. How much you earn depends on three things: the interest rate the bank offers, how much money you have in the account, and how long it sits there.
The catch is that interest rates vary widely. A bank offering 4.5% annual interest will grow your money much faster than one offering 0.01%. Right now, some online banks offer rates around 4% to 5%, while many traditional brick-and-mortar banks offer less than 1%. The difference between these two over a year on $10,000 is roughly $400 versus $100. That gap matters.
Interest also compounds, meaning you earn interest on your interest. If your account compounds daily, the bank calculates and adds interest to your balance every single day, and tomorrow's interest is calculated on today's new, slightly larger balance. Monthly compounding is more common and still works in your favor, just more slowly than daily.
Key Takeaways
- Interest rates on savings accounts range from under 1% at traditional banks to 4% or higher at online banks, so shopping around matters.
- Your money grows through compound interest, which means you earn interest on the interest already added to your account.
- The longer money stays in the account untouched, the more interest it accumulates, because compounding has more time to work.
- Inflation can reduce what your money is actually worth even if the account balance grows, so a higher interest rate protects your purchasing power better.
How interest rates are set and why they change
Banks set their own interest rates, but they do not choose them in a vacuum. The Federal Reserve sets a target range for the federal funds rate—the rate banks charge each other for overnight loans. When the Fed raises this rate, banks typically raise the rates they offer on savings accounts. When the Fed lowers it, savings rates usually fall too.
The Fed raised rates significantly between 2022 and 2023 to fight inflation, and savings account rates climbed along with it. Online banks moved faster than traditional banks, which is why you saw the biggest rate jumps at places like Marcus, Ally, and American Express Personal Savings. Traditional banks often lag behind because they have more overhead and rely on customer deposits less urgently.
Rates can change at any time. Your bank can lower the rate on your account with notice, usually 30 days. Some accounts have fixed rates for a set period; others adjust whenever the bank decides. Read your account agreement or call your bank to understand whether your rate is fixed or variable.
The math: how much your money actually grows
The formula for compound interest is straightforward, but the real-world numbers show why rate shopping matters. If you deposit $5,000 in an account earning 0.5% annually, compounded monthly, you earn about $25 in the first year. The same $5,000 at 4.5% earns roughly $225 in year one. Over five years, the difference is $125 versus $1,200.
The longer your money stays in the account, the more compounding works in your favor. After ten years at 4.5%, that original $5,000 grows to about $7,800. At 0.5%, it grows to roughly $5,250. The higher rate nearly doubles your money; the lower rate barely keeps pace with inflation.
Most banks show you an estimate of how much interest you will earn before you open an account. They use a figure called APY (Annual Percentage Yield), which accounts for compounding. APY is more useful than the raw interest rate because it shows you the real return you will get over a year.
Why inflation matters more than you might think
Your account balance growing is not the same as your money becoming more valuable. Inflation is the rate at which prices rise. If inflation is 3% and your savings account earns 2%, you are actually losing purchasing power—your money buys less than it did a year ago, even though the balance is higher.
This is why the recent jump in savings rates matters. When rates were near zero and inflation was 8%, people with savings accounts were losing money in real terms every month. Now that some accounts offer 4% to 5% and inflation has cooled to around 3%, your savings actually grow in real value. You can buy more next year than you can today.
Check what inflation is running at (the Bureau of Labor Statistics publishes this monthly) and compare it to the APY your bank offers. If the rate is higher than inflation, your money is genuinely growing. If it is lower, you are treading water.
How to find accounts with higher interest rates
Online banks almost always offer higher rates than traditional banks because they have lower costs. They do not maintain physical branches, so they pass savings to customers through better rates. The trade-off is that you cannot walk into a location to deposit cash or speak to someone in person.
Comparison sites like Bankrate, DepositAccounts, and NerdWallet list current rates across dozens of banks and update them regularly. You can sort by APY to see which accounts are paying the most right now. Read the fine print: some banks offer high rates only on balances above a certain amount, or they lower the rate after a promotional period.
All deposits at FDIC-insured banks are protected up to $250,000 per account holder, per bank. This means you can safely move your money to whichever bank offers the best rate without worrying about losing your principal if the bank fails. The only real downside to switching is the time it takes to set up a new account and transfer money, which usually takes one to three business days.
When a savings account is the right place for your money
A savings account is designed for money you need to access within a year or two. Interest rates are modest compared to longer-term investments like bonds or certificates of deposit (CDs), but your money stays liquid—you can withdraw it without penalty whenever you need it.
If you have an emergency fund or are saving for something within the next year or two, a high-yield savings account is a solid choice. You earn more than you would in a checking account, your money is safe and insured, and you can get to it quickly. If you are saving for retirement or a goal more than five years away, you might earn more in a CD or other investment, but that comes with less flexibility.
The best strategy is often to keep three to six months of expenses in a high-yield savings account for emergencies, and put longer-term savings elsewhere. This way your emergency fund is earning real interest while you are not tempted to dip into retirement savings.
Frequently Asked Questions
Can I lose money in a savings account?
Your principal is protected by FDIC insurance, so you cannot lose the money you deposit. However, if inflation is higher than your interest rate, your money loses purchasing power—it buys less than it did before. This is not a loss in the account balance, but it is a real loss in what your money can do.
How often is interest added to my account?
Most banks compound interest daily or monthly and deposit it into your account monthly. Some compound quarterly. The more frequently interest compounds, the more you earn, though the difference is usually small. Check your account agreement or ask your bank how often they compound.
Do I have to pay taxes on savings account interest?
Yes, interest earned on a savings account is taxable income. Your bank will 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 higher your interest rate, the more you will owe in taxes, though the interest is still worth earning.
What is the difference between a savings account and a money market account?
A money market account usually offers a higher interest rate than a savings account, but it often requires a larger minimum balance and limits how many withdrawals you can make per month. If you need frequent access to your money, a savings account is more flexible. If you have a larger balance and do not need to withdraw often, a money market account may pay more.
Should I move my money if another bank offers a higher rate?
If the rate difference is significant—say, 1% or more—and you have a substantial balance, it is worth moving. The interest you earn over a year will outweigh the time it takes to switch. Use a bank's transfer service to move money directly from your old account; it usually takes one to three business days and requires no action on your part beyond authorizing it.