A savings account holds your money at a bank or credit union and pays you interest on the balance

When you deposit money into a savings account, the bank takes that cash and lends it out to other customers as mortgages, car loans, and business credit. In exchange, the bank pays you interest — a percentage of your balance, calculated and added to your account on a schedule set by the bank. That interest is how the bank shares some of its profit with you for letting them use your money.

The amount of interest you earn depends on two things: how much money sits in the account and what interest rate the bank offers. A bank offering 4.5% annual interest will pay you more than one offering 0.01%, even if the balance is identical. The rate changes based on what the Federal Reserve does with its own interest rates, so the rate your bank offers today may be different three months from now.

Your money stays yours. You can withdraw it whenever you want, and the bank cannot use it without your permission. The Federal Deposit Insurance Corporation (FDIC) insures deposits up to $250,000 per account holder per bank, which means if the bank fails, the government covers your balance up to that limit.

Key Takeaways

  • A savings account lets you deposit money that the bank lends out, and the bank pays you interest as a share of the profit from those loans.
  • Interest rates vary by bank and change over time, so comparing rates across banks can mean earning significantly more on the same balance.
  • You can withdraw your money at any time without penalty, though some accounts limit how many withdrawals you can make per month.
  • The FDIC insures balances up to $250,000 per account holder per bank, protecting your money if the bank fails.
  • Interest is usually calculated daily but added to your account monthly, quarterly, or annually depending on the bank's schedule.

How interest gets calculated and added to your account

Banks calculate interest using a formula based on your balance, the interest rate, and the time period. Most banks use daily compounding, which means they calculate how much interest you earned each day, then add that interest to your balance. The next day, they calculate interest on the new, slightly higher balance — so you earn interest on the interest you just received. This is called compound interest.

The schedule for when interest actually appears in your account varies. Some banks add interest monthly, others quarterly (every three months), and some annually. The bank's disclosure documents will state this schedule. Even if interest is calculated daily, you will not see it in your account until the bank's posting date arrives.

For example: if you have $10,000 in an account earning 4% annual interest with daily compounding and monthly posting, the bank calculates roughly $0.33 per day (4% ÷ 365 days), but you will not see that money appear until the first day of the next month. At that point, roughly $10 in interest posts to your account at once.

The difference between savings accounts and checking accounts

A checking account is designed for money you spend regularly. It comes with a debit card and checks, lets you make unlimited withdrawals and transfers, and typically pays little to no interest. A savings account is designed for money you want to keep and grow. It usually has fewer withdrawal options, may limit how many times per month you can move money out, and pays interest.

Banks impose withdrawal limits because of a Federal Reserve rule that once limited savings account withdrawals to six per month. That rule was suspended in 2020, but many banks kept the limits anyway because they help distinguish savings from checking. Some banks charge a fee if you exceed the limit; others straightforward refuse the withdrawal. Check your bank's terms to know what applies to your account.

The practical difference: use checking for bills and everyday spending, and use savings for money you want to set aside and earn interest on. Some people keep both at the same bank for convenience.

What happens when you deposit or withdraw money

When you deposit cash or a check at a branch, the teller counts it, records it in the system, and the money appears in your account when ready (for cash) or within one to two business days (for checks, while the bank verifies the check is good). If you deposit through an ATM, the money is usually available the next business day.

When you withdraw cash from an ATM or teller, the money leaves your account right away. If you transfer money to another bank account, the timing depends on the method. A transfer within the same bank usually completes in minutes. A transfer to a different bank takes one to three business days because the banks have to coordinate through the Federal Reserve or a private clearing network.

Your account balance shown online reflects pending transactions — deposits that have not yet cleared and withdrawals that have not yet posted. The actual available balance may be slightly different. If you withdraw more than you have, the bank may cover it as an overdraft (and charge a fee) or refuse the transaction.

Why interest rates vary between banks

Banks set their own interest rates based on what they can earn by lending out deposits, what they pay to attract customers, and how much competition exists in their market. Online banks typically offer higher rates than brick-and-mortar banks because they have lower overhead costs — no branch buildings, fewer employees, lower rent. A bank in a competitive market with many rivals may offer higher rates to attract deposits.

The Federal Reserve's interest rate (the rate at which banks lend to each other) is the foundation. When the Fed raises its rate, banks eventually raise the rates they offer on savings accounts. When the Fed cuts its rate, banks cut savings rates. The lag between a Fed move and a bank's response can be weeks or months.

Rate shopping matters. If one bank offers 4.5% and another offers 0.01%, the difference on a $10,000 balance is roughly $450 per year. Over five years, that gap compounds significantly. Websites that compare savings rates across banks can help you see what is available in your area or online.

Fees and account minimums

Some banks charge a monthly maintenance fee ($5 to $15 is common) unless you keep a minimum balance or set up direct deposit. Others charge no monthly fee at all. Banks may also charge fees for exceeding withdrawal limits, overdrafts, or requesting a paper statement.

Minimum balance requirements vary. Some banks require $100 to $500 to open an account. Others require $5,000 or more to earn the advertised interest rate — if your balance falls below that, you earn a lower rate or no interest at all. A few banks have no minimum at all. Read the account disclosure before opening to know what applies.

The best account for you depends on how much you plan to keep in savings and how often you need to access it. If you have a small balance and make frequent withdrawals, a no-fee, no-minimum account makes sense. If you have a large balance and rarely touch it, a high-rate account with a minimum balance requirement may earn you more interest than the fees cost.

How banks use your deposits

When you deposit $5,000, the bank does not lock that money in a vault with your name on it. Instead, the bank adds $5,000 to its pool of deposits and lends portions of that pool to other customers. A mortgage borrower might receive $300,000, a small business might borrow $50,000, and a car buyer might borrow $25,000 — all funded partly by deposits like yours.

The bank charges the borrower an interest rate higher than what it pays you. If the bank pays you 4% on savings but charges a mortgage borrower 6.5%, the bank keeps the 2.5% difference as profit (minus its operating costs). This spread — the gap between what the bank pays depositors and what it charges borrowers — is how banks make money.

You do not need to know which specific borrower is using your money. The bank manages the flow of deposits and loans. Your account balance and interest are may provide regardless of whether the bank's loans perform well or poorly. The FDIC insurance backs that may provide.

Frequently Asked Questions

Can I lose money in a savings account?

No. Your balance cannot go down because of market performance or bank decisions. It can only decrease if you withdraw money or the bank charges fees. The FDIC insures your balance up to $250,000, so even if the bank fails, you keep your money.

How often should I check my savings account balance?

Check it whenever you need to know how much you have. Some people check weekly, others monthly. Checking does not affect the account or the interest you earn. Online banking lets you check anytime without visiting a branch.

What is the difference between APY and interest rate?

The interest rate is the percentage the bank pays per year. APY (Annual Percentage Yield) is the rate after accounting for compound interest. If a bank compounds interest daily, the APY will be slightly higher than the stated rate. Banks must disclose the APY so you can compare accounts fairly.

Do I have to pay taxes on savings account interest?

Yes. Interest earned 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 that amount on your tax return. The interest is taxed as ordinary income at your regular tax rate.

Can a bank lower my interest rate without warning?

Yes. Banks can change rates at any time. They usually notify you before the change takes effect, but the notification may come via email or your online account statement. Read your account disclosures to understand what the bank can change and how much notice it must give.