The amount you earn depends on your account's APY and how much you keep in it

The interest you make in a savings account comes from one number: your Annual Percentage Yield, or APY. This is the percentage of your balance the bank pays you each year. If you have $1,000 in an account with a 4.5% APY, you earn roughly $45 per year — though the actual amount depends on how often the bank compounds your interest and whether your balance stays the same.

The real picture is simpler than it sounds: more money in the account, higher APY, and longer time sitting there all mean more interest in your pocket. But the numbers are usually smaller than people expect, because savings account rates are modest compared to other ways to use money.

Key Takeaways

  • Your earnings equal your balance multiplied by the APY, divided by 12 if you want a monthly figure — so $1,000 at 4.5% APY earns about $3.75 per month.
  • Banks compound interest daily, weekly, or monthly, meaning you earn small amounts of interest on the interest you already earned, but the effect is usually less than 1% more per year.
  • APY varies widely between banks — from under 0.01% at some large national banks to 4% or higher at online banks — so the bank you choose matters more than the amount you deposit.
  • Interest is taxed as income, so your actual take-home earnings are lower than the APY suggests, depending on your tax bracket.
  • Savings accounts are meant to keep money safe and accessible, not to grow it quickly — if you want larger returns, you would need to accept more risk or lock money away longer.

How the math works with real numbers

Start with the simplest version: take your account balance, multiply it by the APY as a decimal, and divide by 12 to get your monthly earnings. A $5,000 balance at 4.5% APY earns $5,000 × 0.045 ÷ 12 = $18.75 per month, or about $225 per year.

This assumes your balance stays exactly the same all year. In reality, you probably add money or withdraw it, so your actual earnings will be different. Banks calculate interest on your daily balance, so deposits and withdrawals change what you earn that day forward. If you deposit $5,000 on January 1 and leave it untouched, you get the full year's interest. If you deposit it on July 1, you get roughly half.

The compounding effect — earning interest on your interest — adds a tiny bit more. If your bank compounds daily, you earn a fraction of a cent on yesterday's interest, which earns a fraction of a cent tomorrow, and so on. Over a year, this compounds to maybe 0.1% more than straightforward math would show. It is real but small.

Why the bank you choose matters far more than the amount

The difference between banks is enormous. A large national bank might offer 0.01% APY on savings, while an online bank offers 4.5% or higher on the same type of account. On a $10,000 balance, that is $1 per year versus $450 per year — a difference of $449 that has nothing to do with how much you saved.

Online banks pay higher rates because they have lower overhead costs: no physical branches, fewer employees, lower rent. They pass those savings to customers through better APY. National banks with many branches often pay less because they spend more to run those locations. Both are equally safe — the FDIC insures deposits up to $250,000 at any bank — so there is no reason to accept a lower rate for the sake of a familiar name.

APY also changes over time. When the Federal Reserve raises interest rates, banks gradually raise what they pay on savings. When rates fall, so do savings account rates. You might open an account at 4.5% and see it drop to 3.5% six months later. This is normal and affects all banks, though some move faster than others.

What happens to your interest at tax time

Interest you earn in a savings account is taxed as ordinary income. If you earned $225 in interest last year, that $225 counts as income on your tax return. The bank will send you a 1099-INT form in January showing how much you earned.

Your tax bracket determines how much of that interest you actually keep. If you are in the 22% tax bracket, you owe roughly $50 in taxes on that $225 in interest, leaving you with $175. If you are in the 12% bracket, you owe about $27, leaving you with $198. This is why the real return on a savings account is lower than the APY suggests — the APY is the gross amount before taxes.

Comparing savings accounts side by side

When you are deciding between accounts, the APY is the main number to compare. Look at the current rate each bank is advertising, not the rate they offered six months ago. Some banks show APY prominently; others bury it in small print. The Federal Deposit Insurance Corporation (FDIC) website has a tool that lets you search for current rates at banks in your area, though it does not cover every institution.

Beyond APY, check whether the account has monthly fees, minimum balance requirements, or limits on how many times you can withdraw per month. Some accounts charge $5 or $10 monthly if your balance drops below a certain level — that fee can wipe out months of interest earnings. Others limit you to six withdrawals per month, which matters if you need access to your money frequently.

Why savings accounts earn less than other options

Savings accounts are designed to be safe and accessible. You can withdraw your money anytime without penalty, and the FDIC insures it. Because of that safety and access, banks pay less interest than they would on money you agree to lock away. A certificate of deposit (CD) might pay 5% or higher because you promise not to touch the money for six months or a year. A money market account might pay slightly more than savings because you agree to keep a higher minimum balance.

If you have money you will not need for several years, a CD or other longer-term product might earn you more. But if you need the money to stay accessible — for emergencies or upcoming expenses — a savings account is the right choice, and the interest is a bonus rather than the main point.

How to find the best rate for your situation

Start by listing what you need: Do you need to withdraw money frequently, or is this money you will leave alone? Do you want a physical branch nearby, or are you comfortable with online-only banking? Do you have a large balance, or a small one? Some banks offer higher rates only on balances above $25,000, while others pay the same rate on any amount.

Once you know what you need, search for current rates at online banks, credit unions, and any national banks you already use. Write down the APY, any monthly fees, and the minimum balance requirement for each. Calculate what you would earn in a year at each rate, then subtract any fees. The account with the highest net earnings is usually the best choice, unless the difference is small and you have a strong reason to stay with your current bank.

Frequently Asked Questions

Does the interest compound monthly or daily?

Banks compound daily, meaning they calculate interest on your balance each day and add it to your account. Daily compounding earns you slightly more than monthly or yearly compounding, but the difference is usually less than 1% per year. The APY already accounts for compounding, so you do not need to do separate math.

If I move my money to a different bank, do I lose the interest I already earned?

No. Interest you earned belongs to you and stays in your account. When you transfer money to a new bank, that interest comes with it. You only lose future interest if you close the account before the month ends, depending on the bank's policy — some pay interest through the day you close, others through the end of the month.

Why do some banks advertise much higher rates than others?

Online banks and credit unions typically pay more because they have lower operating costs. National banks with many physical branches spend more money on rent, staff, and maintenance, so they pay less on savings. Both types are equally safe — FDIC insurance covers deposits up to $250,000 regardless of the bank.

Can I earn more interest by splitting my money across multiple accounts?

No. The interest rate is the same whether you have $1,000 in one account or $500 in two accounts at the same bank. Splitting money across different banks does not earn you more interest, though it can be useful if you have more than $250,000 and want to keep all of it FDIC-insured.

What if the bank lowers its APY after I open the account?

Banks can lower rates anytime, and they do when the Federal Reserve lowers rates. You have no obligation to stay — you can move your money to a bank with a higher rate whenever you want. There is no penalty for closing a savings account and moving to a competitor.