What determines how much you earn

The amount you earn in a savings account depends on three things: how much money you deposit, the interest rate the bank offers, and how long you leave the money there. The bank pays you interest as a percentage of your balance each month or year. A higher interest rate means more money back to you. A larger balance means more money to earn interest on. Time matters because interest compounds — you earn interest on your interest.

The interest rate itself varies widely. Some banks offer 0.01% annual percentage yield (APY), while others offer 4% or higher. The difference between these two is enormous. On $10,000, you would earn about $1 per year at 0.01%, but $400 per year at 4%. Banks set their rates based on what the Federal Reserve does with its benchmark rate, competition with other banks, and how much they need deposits right now.

Key Takeaways

  • Interest rates on savings accounts range from under 0.01% to over 5%, and the bank you choose makes the largest difference in what you earn.
  • Your earnings are calculated as a percentage of your balance, compounded monthly or daily, so higher balances and longer time periods both increase what you make.
  • Online banks typically offer higher rates than brick-and-mortar banks because they have lower operating costs.
  • The interest you earn is taxable income, and you will receive a 1099-INT form from your bank if you earn $10 or more in a calendar year.

How interest compounds and grows your money

Compounding means you earn interest on the interest you already earned. If your account compounds daily, the bank calculates interest on your balance each day and adds it to your account. The next day, you earn interest on the new, slightly larger balance. Over months and years, this adds up.

Here is a concrete example. Suppose you deposit $5,000 in an account earning 4% APY, compounded daily. After one month, you would have roughly $5,016.67. After six months, roughly $5,100. After one year, roughly $5,204. The longer you leave the money untouched, the more the compounding effect grows. At 0.5% APY on the same $5,000, you would earn only about $25 in a year. The difference between 4% and 0.5% is $179 in your pocket over twelve months on that single deposit.

Why rates differ so much between banks

Online banks almost always offer higher rates than traditional banks with physical branches. This is because online banks have no buildings to maintain, no tellers to pay, and no branch networks to support. They pass these savings to customers through higher interest rates. A major national bank might offer 0.01% while an online bank offers 4.5% on the exact same type of account.

Rates also change when the Federal Reserve changes its benchmark rate. When the Fed raises rates, banks usually raise savings account rates within days or weeks. When the Fed cuts rates, banks cut savings rates quickly too. This means the rate you see today may not be the rate you earn six months from now. Some banks raise rates faster than others when the Fed moves, so shopping around periodically makes sense.

How to calculate what you will earn

The formula is straightforward: multiply your balance by the APY, then divide by the number of days in a year. If you have $10,000 at 4% APY, you earn roughly $10,000 × 0.04 ÷ 365 = $1.10 per day. Over a year, that is about $400. Most banks show you the projected annual earnings right on the account details page, so you do not have to do the math yourself.

Keep in mind that the interest rate shown is the APY, not the monthly rate. APY accounts for compounding, so it is the true annual return. If a bank shows 4% APY, you will earn close to 4% per year, not 4% per month. Some older accounts or promotional rates may show APR instead of APY — APR does not account for compounding, so it understates what you actually earn.

What happens to your earnings at tax time

Interest you earn in a savings account is taxable income. The bank reports it to the IRS on a 1099-INT form, which you receive by January 31 of the following year. You must report this income on your tax return, even if the amount is small. If you earned $10 or more in interest during the year, the bank is required to send you a 1099-INT.

The tax you owe on the interest depends on your overall income and tax bracket. If you are in the 22% tax bracket and earn $400 in interest, you will owe roughly $88 in federal income tax on that interest. This is why the real return on your savings is less than the stated APY — you keep only what remains after taxes. Some people use tax-advantaged accounts like IRAs to earn interest without when ready tax consequences, though those accounts have other rules and limits.

Comparing rates across different account types

High-yield savings accounts (HYSAs) offer the highest rates for everyday savings. Money market accounts sometimes offer rates close to HYSAs but may require a higher minimum balance. Traditional savings accounts at brick-and-mortar banks almost always offer lower rates. Certificates of deposit (CDs) lock your money away for a set time — three months, one year, five years — and in exchange offer a may provide rate that is usually higher than a savings account rate.

The trade-off with CDs is access. If you withdraw money before the CD matures, you pay a penalty that can wipe out months of interest. Savings accounts let you withdraw whenever you want with no penalty. Money market accounts sometimes limit how many withdrawals you can make per month. The right choice depends on whether you need the money soon or can afford to lock it away.

Why your earnings might be lower than expected

If you withdraw money during the month, you earn interest only on the balance you actually held. Banks calculate interest based on your daily balance, so pulling out $2,000 mid-month means you earn less that month than if you had left it in. Some banks use an "average daily balance" method, which smooths this out slightly, but the principle is the same: less money in the account means less interest earned.

Fees can also eat into earnings. Some savings accounts charge monthly maintenance fees, overdraft fees, or fees for falling below a minimum balance. These fees come directly out of your account and reduce your net earnings. Most online banks and many traditional banks now offer no-fee savings accounts, so paying fees is avoidable if you shop carefully.

Frequently Asked Questions

How often does the bank pay me interest?

Most banks compound and credit interest daily, meaning they calculate it every day and add it to your account. You see the full amount in your balance, but the actual deposit to your account usually happens monthly. Some banks credit interest quarterly or annually, which means you earn slightly less because compounding happens less often.

Can I lose money in a savings account?

No. Your principal — the money you deposit — is protected by FDIC insurance up to $250,000 per account holder per bank. You will never earn less than you put in. However, if inflation is higher than your interest rate, your money loses purchasing power. If you earn 1% interest but inflation is 3%, your money buys less than it did a year ago.

What is the difference between APY and APR?

APY (annual percentage yield) includes the effect of compounding, so it shows your true annual return. APR (annual percentage rate) does not account for compounding. A 4% APY is better than a 4% APR because you actually earn more. Always compare APY to APY when shopping for accounts.

Do I have to report small amounts of interest on my taxes?

Yes. Any interest you earn is taxable income. The bank reports it on a 1099-INT if you earn $10 or more, but you must report all interest, even amounts under $10. If you earned $3 in interest, you still report it on your tax return.

Will my interest rate stay the same?

No. Banks change savings account rates frequently, usually in response to Federal Reserve decisions. Your rate can go up or down. Some banks raise rates faster than others when the Fed moves, so the rate you earn today may be different in three months.