Interest is paid as a percentage of your balance, added to your account on a schedule set by your bank

When you keep money in a savings account, the bank pays you interest — a small percentage of what you have on deposit. The bank uses your money to lend to other customers and invest, so they share a portion of what they earn with you. The amount you receive depends on three things: how much money sits in your account, the interest rate your bank offers, and how often the bank adds interest to your balance.

Interest is not paid as a lump sum at the end of the year. Instead, most banks calculate and deposit it monthly or daily, though the frequency varies by institution. Some banks compound interest — meaning they calculate interest on your original balance plus any interest already added — which causes your money to grow slightly faster over time.

Key Takeaways

  • Banks pay interest as a percentage of your account balance, typically ranging from 0.01% to 5% annually depending on the account type and current market conditions.
  • Interest is usually added monthly or daily, and compounding means you earn interest on interest already deposited into your account.
  • The actual dollar amount you receive depends on your balance, the rate offered, and how often compounding occurs — a higher balance or rate produces more interest.
  • Banks are required to disclose the Annual Percentage Yield (APY) before you open an account, which shows the true rate including compounding effects.
  • Your interest earnings are reported to the IRS on a Form 1099-INT if you earn $10 or more in a calendar year, and you owe federal income tax on that amount.

How the interest rate and your balance determine what you earn

The dollar amount of interest you receive is calculated by multiplying your account balance by the interest rate, then dividing by the number of times interest is compounded in a year. For example, if you have $10,000 in an account earning 4% APY compounded monthly, the bank divides 4% by 12 months to get roughly 0.33% per month. That 0.33% is applied to your $10,000 balance, earning you about $33 that month. The next month, interest is calculated on $10,033 (your original balance plus the interest just added), so you earn slightly more.

The interest rate itself changes based on what the Federal Reserve does with its benchmark rate. When the Fed raises rates, banks typically raise the rates they offer on savings accounts within weeks or months. When the Fed cuts rates, savings account rates usually fall as well. This means the rate you see today may not be the rate you earn six months from now — banks can change rates at any time, though they must notify you before doing so.

Your balance matters enormously. If you keep $1,000 in the account instead of $10,000, you earn one-tenth as much interest, even at the same rate. This is why moving money into savings only when you need it, rather than keeping a large balance sitting idle, costs you real dollars in foregone interest.

The difference between APY and the stated interest rate

Banks must show you the Annual Percentage Yield (APY) before you open an account. This is different from the interest rate itself. The APY includes the effect of compounding — it shows what you actually earn in a year if you leave the money untouched. The stated interest rate alone does not account for compounding, so it understates your true earnings.

For example, a bank might advertise a 4.50% interest rate compounded daily. The APY might be 4.60% because daily compounding adds a small amount of extra interest throughout the year. When comparing accounts at different banks, always compare APY to APY, not rate to rate. The APY is the honest number that lets you see which account actually pays more.

When and how often interest is deposited into your account

Most banks add interest to your account monthly, though some do it daily, quarterly, or annually. Daily compounding is generally better for you because interest is calculated more frequently, meaning you earn interest on interest more often. Monthly compounding is standard at most large banks. Annual compounding is rare in savings accounts but common in certificates of deposit (CDs).

The date interest is added varies by bank. Some add it on the last day of the month, others on the first day of the next month. Check your account statements to see when your bank deposits interest — it will appear as a small credit to your balance. If you withdraw money before interest is added, you do not lose the interest already earned, but you will earn less interest going forward because your balance is lower.

How interest is taxed and reported to the IRS

Interest you earn on a savings account is taxable income. If you earn $10 or more in interest during a calendar year, your bank must send you a Form 1099-INT by January 31 of the following year. You report this amount on your federal income tax return, and you owe income tax on it at your ordinary tax rate — the same rate you pay on wages or salary.

State income tax also applies to interest earnings in most states. Some states exempt interest income for residents over a certain age, but this is rare. The tax you owe is based on your total income for the year, not just the interest. If you are in a higher tax bracket, you owe more tax on the same interest amount than someone in a lower bracket.

You do not pay tax when the interest is added to your account — you pay it when you file your tax return. This means if you earn $50 in interest but do not withdraw it, you still owe income tax on that $50 even though the money remains in the bank.

Why some accounts pay more interest than others

High-yield savings accounts pay significantly more interest than traditional savings accounts at the same bank. A traditional savings account at a large bank might pay 0.01% APY, while a high-yield account at the same bank pays 4% or more. The difference is not because the bank is being generous — it is because high-yield accounts are designed to attract deposits from people who shop around for rates.

Online banks typically pay higher rates than brick-and-mortar banks because they have lower overhead costs. They do not maintain physical branches, so they pass some of those savings to customers in the form of higher interest rates. Money market accounts and CDs often pay more than savings accounts because you agree to keep the money in the account for a set period or accept restrictions on withdrawals.

The bank's own financial situation also matters. During periods when the Fed keeps rates high, banks have more money to lend at profitable rates, so they can afford to pay depositors more. When rates are low, banks earn less from lending, so they pay less on deposits.

What happens to interest if you close your account or move your money

Interest you have already earned belongs to you, even if you close the account. If your bank adds interest on the last day of the month and you close the account on the 15th, you still receive the interest when it is added on the 30th — the bank will either deposit it into the account before closing it, or send it to you separately.

If you move money to a different bank, you stop earning interest at the old bank once the money leaves. You begin earning interest at the new bank as soon as the deposit clears. There is no gap in earnings, but there is also no overlap — the money earns interest at one place or the other, not both. The timing of when interest is added at each bank matters if you are moving money mid-month, so check both banks' schedules if the timing is tight.

Frequently Asked Questions

Can I earn interest on money I just deposited?

Yes, but only after the deposit clears. If you deposit a check or transfer money from another bank, the funds must be available in your account before interest is calculated on them. This usually takes one to three business days. Once the money is in your account, interest accrues from that point forward.

What if I withdraw money before interest is added?

You do not lose interest you have already earned. Interest that has been added to your account is yours to keep. You will straightforward earn less interest going forward because your balance is lower. Some banks calculate interest based on your lowest balance during the month, so withdrawing money early can reduce that month's interest payment.

Does interest compound if I never withdraw the money?

Yes. If you leave your account untouched, interest is added regularly (usually monthly), and the next interest calculation includes that newly added interest. Over time, this compounding effect causes your balance to grow faster than if interest were only calculated on your original deposit.

Why did my interest rate drop even though I did nothing?

Banks change interest rates based on Federal Reserve decisions and market conditions. They are required to notify you before lowering your rate, usually by email or mail. You can shop for a higher rate at a different bank and move your money if you wish — there is no penalty for switching banks.

Is interest the same as a bonus for opening an account?

No. Interest is ongoing earnings on your balance. A bonus is a one-time payment some banks offer when you meet certain conditions, like depositing a minimum amount or keeping the account open for a set period. Bonuses are separate from interest and are also taxable income.