Interest is money the bank pays you for letting them use your deposit

When you put money in a savings account, the bank lends that money to other customers through mortgages, car loans, and business lines of credit. The bank keeps the difference between what it pays you and what borrowers pay the bank. That difference is your interest—money the bank sends to your account on a schedule, usually monthly or daily.

The amount you earn depends on three things: how much you deposit, how long you leave it there, and the interest rate the bank offers. A higher rate means more money lands in your account. A larger balance means more interest accrues. Time matters because interest compounds—you earn interest on your interest.

You do not have to do anything to earn it. Once your account is open and funded, interest begins accruing automatically. The bank calculates it, deposits it, and you can watch your balance grow without touching the money.

Key Takeaways

  • Interest rates vary widely between banks—from under 0.01% at some large national banks to over 5% at online banks and credit unions, so shopping around can add hundreds of dollars per year to the same deposit.
  • Interest compounds, meaning you earn returns on your returns, so leaving money untouched for longer periods produces noticeably larger gains.
  • High-yield savings accounts at online banks typically pay more than traditional brick-and-mortar banks because online banks have lower overhead costs.
  • The Federal Reserve sets a benchmark rate that influences what banks offer, so rates rise and fall over time—locking in a high rate now may not be possible later.

How interest rates are set and why they change

Banks do not choose their rates in a vacuum. The Federal Reserve sets a target range for the federal funds rate—the rate at which banks lend to each other overnight. When the Fed raises this rate, banks typically raise the rates they offer on savings accounts. When the Fed lowers it, savings rates fall.

Individual banks also compete for deposits. A bank in a competitive market may offer a higher rate to attract new customers. A bank with plenty of deposits may lower its rate because it does not need more money. This is why the same deposit at Bank A might earn 4.5% while Bank B offers 1.2%.

Rates change frequently—sometimes weekly. A rate that is high today may drop in three months. If you find a rate you like, locking it in through a certificate of deposit (CD) can protect you, though CDs require you to leave the money untouched for a set period (three months to five years, typically).

The difference between regular savings accounts and high-yield accounts

A regular savings account at a large national bank typically pays between 0.01% and 0.5% annually. A high-yield savings account at an online bank or credit union typically pays between 4% and 5.5%, depending on current Fed policy. On a $10,000 deposit, the difference is roughly $400 to $500 per year.

High-yield accounts work the same way as regular savings accounts—your money is insured, you can withdraw it anytime, and interest accrues automatically. The main difference is location. Online banks have no physical branches, so they spend less on real estate and staff. They pass those savings to customers through higher rates. Credit unions are member-owned nonprofits and often offer competitive rates as well.

The trade-off is convenience. You cannot walk into a branch to deposit cash or speak to someone in person. Most online banks let you deposit checks by phone camera and transfer money electronically, which works for most people. If you need in-person service, a local credit union may offer a middle ground—rates higher than national banks but with some physical locations.

How to calculate what you will earn

Interest is calculated using a simple formula: Balance × Annual Rate ÷ 365 = Daily Interest. Banks compound this daily, meaning each day's interest gets added to your balance, and the next day's interest is calculated on the new, larger balance.

Here is a concrete example. You deposit $5,000 in a high-yield account paying 5% annually. On day one, you earn roughly $0.68 ($5,000 × 0.05 ÷ 365). On day two, your balance is $5,000.68, so you earn $0.69. By the end of the year, compounding adds up to $256.33 in interest—not $250, because you earned interest on the interest.

Most banks show you a figure called APY (Annual Percentage Yield) instead of just the interest rate. APY includes the effect of compounding, so it is the real number to compare between banks. If Bank A advertises 5% APY and Bank B advertises 5% APY, you will earn the same amount regardless of how often they compound.

Where to find the highest rates right now

Rates change constantly, so the highest rate today may not be the highest next month. To find current rates, visit the websites of online banks (Ally, Marcus, Wealthfront, Vanguard, and others), credit unions in your area, and comparison sites like Bankrate or DepositAccounts. These sites let you filter by rate and sort by APY.

When comparing, check three things: the APY, any minimum deposit requirement, and whether the rate is promotional or permanent. Some banks offer a high rate for three months to new customers, then drop it. Others maintain high rates as their standard offering. Read the fine print or call the bank to ask how long the rate is may provide.

Also confirm that your deposit is FDIC insured (for banks) or NCUA insured (for credit unions). This means the government backs your money up to $250,000 if the bank fails. Nearly all savings accounts carry this protection, but it is worth verifying.

What happens to your money if the bank fails

If a bank closes, the FDIC takes over and pays depositors up to $250,000 per account holder per bank. This means if you have $100,000 in one bank's savings account and $150,000 in another bank's savings account, both are fully protected. If you have $300,000 in one bank, only $250,000 is covered.

Bank failures are rare. The FDIC has a track record of paying out within days. Your money does not disappear—it transfers to another bank or you receive a check. This protection applies whether the bank is online or brick-and-mortar, and whether the account earns 0.01% or 5%.

Strategies to maximize your earnings

If you have a large sum to deposit, splitting it across multiple banks can increase your FDIC coverage. A $500,000 deposit split into two $250,000 accounts at two different banks means both are fully insured. This matters only if you have more than $250,000 to save.

Another strategy is laddering CDs. Instead of putting all your money in one CD that matures in five years, buy five CDs that mature in one, two, three, four, and five years. Each year, one CD matures and you can reinvest it at the current rate. This gives you some flexibility if rates rise while locking in higher rates than a savings account offers.

A third approach is moving money between accounts as rates change. If your current bank drops its rate and a competitor raises theirs, you can transfer your balance. There is no penalty for moving money between savings accounts—only CDs charge early withdrawal fees. Banks count on inertia, so shopping annually can keep you in a higher-earning account.

Frequently Asked Questions

Do I have to pay taxes on interest I earn?

Yes. Interest is taxable income. The bank sends you a 1099-INT form each January showing how much interest you earned. You report this on your tax return. The amount is usually small enough that it does not change your tax bracket, but it still counts as income.

Can I withdraw money from a savings account anytime without penalty?

Yes, from a regular savings account. You can withdraw as much as you want whenever you want. CDs are different—they charge a penalty if you withdraw before the maturity date, typically three to six months of interest. Always check the terms before opening a CD.

What is the difference between APR and APY?

APR (Annual Percentage Rate) is the interest rate without compounding. APY (Annual Percentage Yield) includes compounding. For savings accounts, APY is the number that matters because it shows what you actually earn. Banks are required to display APY prominently.

Is it worth moving my money to a high-yield account if I only have a few thousand dollars?

Yes. On a $5,000 deposit, moving from 0.01% to 5% means earning roughly $250 more per year. That is real money for doing nothing except opening an account and transferring funds once. The effort takes an hour.

What happens to my interest if I close the account?

You keep all interest that has already been deposited into your account. If you close on the 15th of the month and interest posts on the 30th, you lose that month's interest. Check with your bank about the exact timing.