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—for mortgages, car loans, business lines of credit. The bank keeps the difference between what it pays you and what it charges borrowers. That payment to you is called interest.

The amount you earn depends on three things: how much you deposit, how long it sits there, and the interest rate the bank offers. A higher rate means more money in your account. The rate changes based on what the Federal Reserve does with its own rates, so the same bank might offer 0.01% one year and 4.5% the next.

Interest compounds, meaning you earn money on the interest you already earned. If you deposit $1,000 at 4% annual interest, after one year you have $1,040. In year two, you earn 4% on $1,040, not just the original $1,000. Over decades, this difference becomes substantial. Over months, it is small.

Key Takeaways

  • Banks pay interest on savings accounts because they lend your deposit to other customers and keep the spread between what they pay you and what they charge borrowers.
  • The interest rate varies by bank and changes with Federal Reserve policy, so comparing rates across institutions can add hundreds of dollars to your annual earnings.
  • High-yield savings accounts at online banks typically pay 4 to 5 times more than traditional brick-and-mortar banks, though they offer no physical branches.
  • Interest compounds, so leaving money untouched for longer periods means you earn returns on your previous returns, not just your original deposit.
  • The FDIC insures deposits up to $250,000 per account type per bank, so your principal is protected even if the bank fails.

How banks decide what rate to offer you

The Federal Reserve sets a target range for the federal funds rate—the rate banks charge each other for overnight loans. When the Fed raises this rate, banks have less incentive to borrow cheaply, so they raise the rates they offer on savings accounts to attract deposits. When the Fed lowers rates, banks lower savings rates too.

Individual banks also set rates based on how much money they need. A bank flush with deposits might offer 0.50% because it does not need more money. A bank that needs to grow its deposit base might offer 4.75% to pull customers from competitors. This is why the same account type pays different rates at different institutions.

The rate you see advertised is the Annual Percentage Yield, or APY. This is the total return you would earn in one year if you made no deposits or withdrawals and the rate stayed constant. It includes the effect of compounding. Some banks show you the Annual Percentage Rate, or APR, which does not include compounding—always compare using APY.

Why online banks pay more than traditional banks

Online banks have no physical branches, no tellers, no real estate costs. They pass these savings to customers through higher interest rates. A traditional bank might pay 0.01% on a savings account. An online bank might pay 4.50% on the same type of account. Over a year, on a $10,000 deposit, that is the difference between $1 and $450.

Online banks are FDIC-insured the same way brick-and-mortar banks are, so your money is equally protected. The trade-off is that you cannot walk into a branch and speak to someone in person. You manage your account through a website or mobile app, and you contact customer service by phone or email.

Some online banks are subsidiaries of larger traditional banks—Marcus, for example, is owned by Goldman Sachs. Others are independent. All are required to meet the same regulatory standards and insurance requirements as any other bank.

Money market accounts and certificates of deposit as alternatives

A money market account is a hybrid between a checking account and a savings account. It typically pays interest higher than a regular savings account, sometimes as high as a high-yield savings account. In exchange, it may require a higher minimum balance and limit how many withdrawals you can make per month. Some money market accounts come with a debit card or checkbook, so you can access your money more easily than with a savings account.

A certificate of deposit, or CD, locks your money away for a set period—three months, one year, five years. In exchange, the bank pays a higher interest rate than it would on a savings account. If you withdraw before the term ends, you pay a penalty, usually a few months of interest. CDs make sense if you know you will not need the money for a specific period and want to lock in a rate before rates drop.

The difference between these accounts matters only if you plan to withdraw money before the term ends or need frequent access. If you are saving for something years away, a CD might pay 0.5% to 1% more than a high-yield savings account. If you might need the money in six months, a savings account is safer.

How to compare rates and find the best account for your situation

Start by listing what you need: Do you want to withdraw money regularly, or is this money you will not touch for years? Do you need a physical branch, or are you comfortable with online-only banking? How much are you depositing—does the bank have a minimum balance requirement?

Then compare rates across at least three institutions. Websites like Bankrate, DepositAccounts, and NerdWallet list current rates at major banks and update them daily. Write down the APY, any minimum balance requirement, any monthly fees, and how many withdrawals per month are allowed. A bank offering 4.75% with a $25,000 minimum is not better than one offering 4.50% with no minimum if you only have $5,000 to deposit.

Check whether the bank is FDIC-insured. Every legitimate bank displays this information on its website. If you have more than $250,000 to deposit, you can split it across multiple banks or multiple account types at the same bank—each account type is insured separately up to $250,000.

What happens to your interest if rates drop

Interest rates on savings accounts are not fixed. When the Federal Reserve lowers rates, banks lower the rates they pay on savings accounts within days or weeks. Your principal stays the same, but the amount of new interest you earn each month shrinks.

If you lock money into a CD before rates drop, you keep the higher rate for the entire term. If you keep money in a savings account, you earn the new lower rate. This is why some people move money into CDs when rates are high—they are betting rates will fall. If rates rise instead, you are stuck earning the lower CD rate until the term ends.

There is no way to predict whether rates will rise or fall. The Fed's decisions depend on inflation, employment, and economic growth. If you need the money within a year, a savings account is safer because you can move it if rates rise. If you are certain you will not need it for five years, a five-year CD locks in today's rate regardless of what happens next.

The real limits of savings account interest

Even at 4.5% APY, a $10,000 deposit earns $450 per year before taxes. After federal income tax (which applies to interest earnings), you might keep $330 to $360, depending on your tax bracket. If inflation is running at 3%, your money is only gaining real purchasing power at about 1% to 1.5% per year.

Savings accounts are for money you need to keep safe and accessible, not for building wealth. They protect you from emergencies and give you a place to park cash while you decide what to do with it. If you have money you will not need for years, other investments—stocks, bonds, real estate—historically return more over long periods, though they carry more risk.

The point of a high-yield savings account is not to get rich. It is to earn something on money that would otherwise sit in a 0.01% account, and to do so without risk. The difference between 0.01% and 4.5% on $10,000 is $440 per year. That is not wealth-building, but it is real money.

Frequently Asked Questions

Do I have to pay taxes on savings account interest?

Yes. Interest earnings are taxable income. Your bank sends you a 1099-INT form each January showing how much interest you earned the previous year. You report this on your tax return. The tax rate depends on your overall income and tax bracket. High-yield savings accounts do not change this—the interest is taxable whether you earn 0.01% or 4.5%.

What happens to my money if the bank fails?

The FDIC insures your deposit up to $250,000 per account type per bank. If the bank fails, the FDIC pays you the full amount, usually within a few business days. This protection applies to savings accounts, checking accounts, and money market accounts separately, so you could have $250,000 in each and be fully covered at one bank.

Can I move my money to a different bank if rates drop?

Yes. There is no penalty for moving money from a savings account to another bank. You can open an account at a new bank, transfer your money, and close the old account whenever you want. With CDs, you pay a penalty if you withdraw before the term ends, usually a few months of interest.

Is a high-yield savings account safe if it is online-only?

Yes, as long as it is FDIC-insured. Online banks are regulated the same way as traditional banks and must meet the same capital and safety requirements. Your money is not sitting in a server somewhere unprotected—it is held in a bank account backed by the full faith of the FDIC insurance system.

How often does interest compound?

Most banks compound interest daily, meaning they calculate and add interest to your account every day. Some compound monthly or quarterly. Daily compounding means slightly more money in your account over time, but the difference is small unless you are earning high rates on large balances. The APY already accounts for the compounding frequency, so you can compare rates directly.