Savings interest is money your bank pays you for keeping money in your account

When you deposit money into a savings account, the bank lends that money to other customers through mortgages, car loans, and business lines of credit. In exchange for the use of your money, the bank pays you interest—a percentage of your balance, calculated and added to your account on a regular schedule. The amount you earn depends on three things: how much money you have in the account, how long it stays there, and the interest rate the bank is offering.

Interest rates vary widely. A high-yield savings account at an online bank might pay 4% to 5% annually, while a traditional brick-and-mortar bank might pay 0.01% or less. The difference between these two rates is real money: on a $10,000 balance, 4.5% earns you $450 per year, while 0.01% earns you $1. Where you keep your money matters.

Key Takeaways

  • Banks pay you interest as a percentage of your account balance, usually expressed as an annual rate even if interest is added monthly or daily.
  • The interest rate you receive depends on the bank, the type of account, and current market conditions—not on how long you have been a customer.
  • Interest is calculated on your average daily balance or your ending balance, depending on the bank's method, so the exact amount varies month to month.
  • High-yield savings accounts at online banks typically pay significantly more than traditional savings accounts at large national banks.

How banks calculate the interest you earn

Banks use one of two methods to calculate interest: average daily balance or ending balance. With average daily balance, the bank adds up your balance at the end of each day during the month, divides by the number of days, and pays interest on that average. With ending balance, the bank straightforward looks at what you have on the last day of the month and pays interest on that amount. Average daily balance is more common and usually more favorable to you, because deposits early in the month count toward your interest even if you withdraw the money later.

The actual interest rate quoted by banks is called the Annual Percentage Yield (APY). This is the rate you will earn over a full year, including the effect of compounding—meaning interest earned on your interest. If a bank quotes 4.5% APY, that is the total you will earn in a year if you leave the money untouched. Interest is usually added to your account monthly, though some banks add it daily or quarterly. The more frequently interest compounds, the slightly more you earn, but the difference is small unless the rate is very high.

Why interest rates change and what affects yours

Banks set their savings rates based on what the Federal Reserve does with its benchmark interest rate, which it adjusts several times per year. When the Fed raises rates, banks eventually raise what they pay on savings accounts. When the Fed cuts rates, banks cut savings rates too—sometimes when ready, sometimes after a delay. This is why the rate you see today might be different from the rate you saw three months ago.

Your personal rate also depends on the type of account. A money market account might pay more than a regular savings account at the same bank. A certificate of deposit (CD) locks your money away for a set period—three months, one year, five years—and usually pays more than a savings account because the bank knows it can use your money for longer. A high-yield savings account has no lock-in period but pays significantly more than a traditional savings account because online banks have lower overhead costs.

The size of your balance does not affect your rate. A bank will not pay you 5% on $100,000 and 2% on $1,000. Everyone at the same bank with the same account type gets the same rate. However, some banks do offer tiered rates where larger balances earn slightly more, though this is less common than it used to be.

The difference between savings accounts and other interest-bearing accounts

A regular savings account is the most flexible option: you can deposit and withdraw money whenever you want without penalty. The tradeoff is a lower interest rate. A money market account is a hybrid—it pays more interest than a savings account but limits how many withdrawals you can make per month (usually six). A certificate of deposit (CD) locks your money for a fixed term and pays the highest rate, but you cannot touch the money without paying an early withdrawal penalty, typically equal to a few months of interest.

High-yield savings accounts sit between regular savings and money market accounts in terms of flexibility. They have no withdrawal limits, no lock-in period, and no minimum balance requirement at most banks. The main reason they pay more is that online banks do not maintain physical branches, so they pass the savings on to customers. If you want to earn the most interest without locking your money away, a high-yield savings account is usually the best choice.

What happens to your interest if you withdraw money early

Withdrawing money from a savings account or money market account does not trigger a penalty. Your interest is calculated on whatever balance you have, so if you withdraw $5,000 midway through the month, next month's interest will be lower. You do not lose the interest you already earned—it stays in your account.

CDs are different. If you withdraw money before the maturity date, the bank charges an early withdrawal penalty. This penalty varies by bank and by the CD's term: a three-month CD might charge 10 days of interest, while a five-year CD might charge 150 days of interest. The penalty is deducted from your principal, so you could end up with less money than you started with if you withdraw very early. Always check the penalty terms before you open a CD.

How to compare interest rates between banks

The simplest way to compare is to look at the APY each bank is currently offering for the account type you want. Websites like Bankrate, DepositAccounts, and the FDIC's BankFind tool let you search by account type and see rates from multiple banks side by side. Because rates change frequently, check the date the rate was last updated—a rate quoted two weeks ago may no longer be accurate.

When you compare, make sure you are looking at the same account type at each bank. A high-yield savings account at Bank A might pay 4.5%, while a regular savings account at Bank B pays 0.05%—the difference is not because Bank B is worse, but because you are looking at different products. Also check whether the bank has a minimum balance requirement or monthly fees that could eat into your interest earnings. A bank paying 4.5% with a $25 monthly fee is worse than a bank paying 4.0% with no fees, depending on your balance.

How FDIC insurance protects your interest earnings

The Federal Deposit Insurance Corporation (FDIC) insures deposits at member banks up to $250,000 per depositor, per bank, per account type. This means if the bank fails, you get your money back—including any interest that has been added to your account. Interest that has been credited to your account is covered by FDIC insurance. Interest that has been earned but not yet credited is also covered, as long as it was earned before the bank failed.

If you have more than $250,000 to save, you can open accounts at multiple banks to keep everything insured. For example, you could put $250,000 in a savings account at Bank A and $250,000 in a savings account at Bank B, and both amounts would be fully insured. Money market accounts and CDs are also FDIC insured up to $250,000 each, and they count as separate categories, so you could have $250,000 in a savings account and $250,000 in a CD at the same bank and both would be covered.

Frequently Asked Questions

Do I have to pay taxes on savings interest?

Yes. Interest earned on savings accounts is taxable income. Banks send you a Form 1099-INT at the end of the year if you earned $10 or more in interest. You report this on your tax return. The amount of tax you owe depends on your tax bracket, so the same $100 in interest might cost you $12 in taxes if you are in the 12% bracket or $24 if you are in the 24% bracket.

Why is my interest rate lower than what the bank advertised?

The advertised rate is the APY, which assumes your money stays in the account for a full year. If you withdraw money partway through the month, your interest for that month is calculated on a lower average balance. Also, if the bank recently lowered its rate and you opened your account before the change, you might be grandfathered in at the old rate. Check your account statements to see what rate is actually being applied.

Can I move my money to a different bank if the interest rate drops?

Yes. There is no penalty for closing a savings account and moving your money to another bank. You do not lose any interest you have already earned. If you move money out of a CD before maturity, you will pay an early withdrawal penalty, but you can move the remaining balance to another bank's CD if you want.

What is the difference between APY and APR?

APY (Annual Percentage Yield) is what banks use for savings accounts and CDs—it includes the effect of compounding. APR (Annual Percentage Rate) is what lenders use for loans and credit cards—it does not include compounding. For savings, always look at APY, not APR.