What determines how much interest you earn
The amount of interest you earn depends on three things: the annual percentage yield (APY) the bank offers, how much money you keep in the account, and how long it stays there. A bank offering 4.5% APY on $10,000 for one year will pay you roughly $450 in interest. The same $10,000 at 0.01% APY—what some traditional banks offered before 2023—would earn about $1.
APY varies widely. Online banks typically offer higher rates than brick-and-mortar banks because they have lower overhead costs. Right now, some online savings accounts offer between 4% and 5.35% APY, while traditional banks often offer 0.01% to 0.05%. These rates change constantly—sometimes weekly—based on what the Federal Reserve does with its benchmark interest rate.
The bank compounds your interest, meaning you earn interest on the interest you've already earned. With daily compounding (the most common method), your balance grows slightly faster than straightforward math suggests. The difference is small on modest balances but becomes noticeable with larger amounts or over longer periods.
Key Takeaways
- Your earnings depend on the APY rate, your account balance, and how long the money stays in the account.
- Online banks currently offer significantly higher APY rates—often 4% to 5.35%—than traditional banks, which typically offer less than 0.1%.
- Interest compounds daily at most banks, meaning you earn small amounts of interest on your accumulated interest.
- A $10,000 balance earning 4.5% APY generates roughly $450 per year, while the same balance at 0.01% generates about $1 per year.
How interest compounds and grows your balance
Compounding works like this: on day one, the bank calculates interest on your starting balance. That interest gets added to your account. On day two, the bank calculates interest on your new, slightly larger balance—which includes the interest from day one. This repeats every day for the year.
With daily compounding at 4.5% APY, a $10,000 deposit grows to $10,460.45 after one year, not $10,450. The extra $10.45 comes from earning interest on the interest. The effect is small in year one but compounds over time. After five years at the same rate, that $10,000 becomes $56,568—more than half again larger than the original amount.
Some savings accounts compound monthly or quarterly instead of daily. Daily compounding always works in your favor because interest accrues more frequently. When comparing accounts, the APY already accounts for the compounding method, so you can compare rates directly without doing extra math.
Real earnings at different account balances and rates
The table below shows what you'd earn in the first year and after five years at different balances and rates. These figures assume you deposit the money once and leave it untouched. If you add money regularly, your earnings will be higher because each deposit also earns interest. If you withdraw money, your earnings drop proportionally.
| Account Balance | APY Rate | Annual Interest Earned | After 5 Years (with compounding) |
|---|---|---|---|
| $1,000 | 4.5% | $45 | $5,657 |
| $10,000 | 4.5% | $450 | $56,568 |
| $50,000 | 4.5% | $2,250 | $282,840 |
| $10,000 | 0.05% | $5 | $10,025 |
| $10,000 | 5.0% | $500 | $63,815 |
The difference between a 0.05% account and a 4.5% account is stark. On $10,000, you earn $5 per year at the lower rate versus $450 at the higher rate. Over five years, that's $25 versus $6,568—a gap of over $6,500 on the same deposit. This is why the bank you choose matters as much as the amount you save.
Why rates differ between banks and account types
Online banks pay higher rates because they don't maintain physical branches, employ fewer staff, and operate with lower costs overall. They pass some of those savings to customers through better APY. Traditional banks with branch networks have higher expenses and typically offer lower rates to maintain profit margins.
Money market accounts sometimes offer slightly higher rates than regular savings accounts, but they usually require a larger minimum deposit—often $2,500 to $10,000—and limit how many withdrawals you can make per month. Certificates of deposit (CDs) lock your money away for a set period (three months to five years) but often pay more than savings accounts for that trade-off.
High-yield savings accounts are straightforward savings accounts with higher APY. There's no special product category—the term just means the bank is offering a competitive rate. The FDIC insures these accounts the same way it insures regular savings accounts, up to $250,000 per depositor per bank.
How rate changes affect your earnings
When the Federal Reserve raises or lowers its benchmark rate, banks adjust their savings account APY within days or weeks. If you're earning 4.5% and rates drop to 3.5%, your new deposits and any money you add will earn at the lower rate. Money already in the account continues earning at the old rate until the bank changes it, which they can do at any time.
This means the best time to move money into a high-yield savings account is when rates are high. If you expect rates to fall, capturing a higher rate sooner rather than later means more interest over time. Conversely, if rates are rising, a CD might make sense because it locks in a rate for a set period and protects you from future rate cuts.
Rates have moved significantly in recent years. In 2021 and early 2022, most savings accounts earned less than 0.1% APY. By late 2023, competitive online banks were offering 4% to 5%. These swings mean the difference between earning almost nothing and earning hundreds or thousands of dollars per year on the same balance.
Taxes on savings account interest
Interest you earn is taxable income. The 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 as ordinary income, which means it's taxed at your regular income tax rate, not at a lower capital gains rate.
If you earn $450 in interest and your tax bracket is 22%, you'll owe roughly $99 in federal taxes on that interest. This doesn't come out of your account automatically—you pay it when you file your taxes. Some states also tax interest income, so your total tax bill may be higher.
This is why the actual money you keep is less than the interest earned. A $10,000 balance earning 4.5% APY generates $450 in interest, but after taxes you might keep only $350 to $380 of that, depending on your tax situation. Understanding this gap helps you set realistic expectations for what your savings will actually grow.
Comparing savings accounts to other ways to save
Savings accounts are safe and liquid—you can withdraw your money anytime without penalty. Money market accounts and CDs offer similar safety but with different trade-offs. A CD pays more interest but locks your money away; a money market account pays slightly more than savings but limits withdrawals.
Treasury bills and bonds issued by the U.S. government currently offer rates competitive with or higher than savings accounts. A one-year Treasury bill might pay 5% to 5.5%, and you can buy them directly from the government with no fees. The trade-off is that your money is locked in for the full term, and you can't access it early without selling on the secondary market.
Investment accounts (stocks, bonds, mutual funds) have higher potential returns but also carry risk of loss. Savings accounts may provide your principal and interest as long as the bank is FDIC-insured. The choice depends on your timeline and how much risk you're willing to take with money you may need soon.
Frequently Asked Questions
Can I earn interest on interest in a savings account?
Yes. Banks compound interest daily at most savings accounts, meaning you earn interest on the interest that's already accumulated. Over time, this compounds into meaningful growth. A $10,000 balance at 4.5% APY earns $10.45 extra in year one just from compounding, and the effect grows larger in subsequent years.
What's the difference between APY and APR for savings accounts?
APY (annual percentage yield) includes the effect of compounding, while APR (annual percentage rate) does not. For savings accounts, always look at APY because it shows what you'll actually earn. Banks are required to display APY prominently, so you can compare rates directly between accounts.
Do I have to pay taxes on savings account interest?
Yes. Interest is taxable income reported on a 1099-INT form if you earn $10 or more per year. You pay taxes at your regular income tax rate when you file your return. This means your actual take-home earnings are less than the interest the bank credits to your account.
Is my money safe in a high-yield savings account?
Yes, as long as the bank is FDIC-insured. The FDIC protects up to $250,000 per depositor per bank, regardless of the APY rate. High-yield savings accounts are regular savings accounts with better rates—they carry the same safety and insurance as any other savings account.
What happens to my interest rate if the bank lowers it?
The bank can lower your rate at any time, usually within days or weeks of a Federal Reserve rate cut. Money already in your account continues earning at the current rate until the bank changes it. You can move your money to a different bank offering a higher rate, but you'll owe taxes on any interest earned before you move it.