Interest is how banks pay you to hold money with them

When you deposit money into a savings account, the bank lends that money to other customers—for mortgages, car loans, credit cards. The bank charges those borrowers interest. A portion of what the bank collects goes back to you as interest, calculated as a percentage of your balance. That percentage is your annual percentage yield, or APY.

The bank sets the APY, and it changes based on what the Federal Reserve does with its benchmark interest rate. When the Fed raises rates, banks typically raise savings APYs. When the Fed cuts rates, APYs fall. Your money sits in the account and earns this interest automatically—you do not have to do anything after you deposit it.

The amount you earn depends on three things: how much money you have in the account, what APY the bank offers, and how long the money stays there. A $10,000 balance at 4.50% APY earns roughly $450 per year. The same $10,000 at 0.01% APY earns $1 per year. The difference between banks is real and worth checking before you open an account.

Key Takeaways

  • Interest rates on savings accounts vary widely between banks—from under 0.01% at some large national banks to over 5% at online banks, so comparing rates before you deposit matters.
  • High-yield savings accounts at online banks typically offer the highest APY because they have lower overhead costs than brick-and-mortar branches.
  • Money market accounts and certificates of deposit (CDs) offer higher rates than regular savings accounts, but CDs lock your money away for a set period.
  • Interest compounds, meaning you earn interest on the interest you already earned, so leaving money untouched for longer increases your total return.
  • The Federal Reserve's interest rate decisions flow down to what banks offer, so rates you see today will not stay the same forever.

High-yield savings accounts pay significantly more than standard savings accounts

A high-yield savings account is a regular savings account with a much higher APY. Online banks like Marcus, Ally, and American Express Personal Savings typically offer rates between 4% and 5.35%, depending on the current rate environment. Traditional banks with physical branches—Chase, Bank of America, Wells Fargo—usually offer rates under 0.50% on their standard savings products.

The difference comes down to cost. Online banks have no branch network to maintain, no tellers to pay, no real estate to lease. They pass those savings to customers through higher interest rates. You access your money through a website or app instead of walking into a building. The tradeoff is worth it if you are comparing rates: $10,000 earning 4.50% at an online bank generates $450 per year, while the same $10,000 at a traditional bank earning 0.10% generates $10 per year.

High-yield savings accounts are still savings accounts—your money is liquid, meaning you can withdraw it whenever you need it. There is no penalty for taking money out early, unlike a CD. The rate can change, and banks do lower rates when the Fed cuts its benchmark rate, but your principal (the money you deposited) is always yours to access.

Certificates of deposit lock your money in exchange for a may provide higher rate

A certificate of deposit, or CD, is a product where you agree to leave money with the bank for a set period—typically three months, six months, one year, or five years. In return, the bank guarantees you a fixed APY for that entire period, and that rate is almost always higher than what a savings account offers. A one-year CD might pay 5.00% while a high-yield savings account pays 4.50%.

The catch is that your money is locked. If you withdraw before the term ends, you pay an early withdrawal penalty. The penalty amount varies by bank and by CD term—a three-month CD might charge 10 days of interest, while a five-year CD might charge 150 days of interest. You lose that interest as a penalty, which can mean withdrawing less than you deposited if rates have fallen since you bought the CD.

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 fall. If you might need the money sooner, the penalty risk makes a high-yield savings account safer. Some banks offer "no-penalty CDs" with slightly lower rates but no early withdrawal fee—these split the difference between flexibility and may provide return.

Money market accounts combine features of savings accounts and checking accounts

A money market account is a hybrid product. It works like a savings account—your money earns interest, and the rate is typically higher than a standard savings account but sometimes lower than a high-yield savings account. It also includes a debit card and check-writing privileges, like a checking account, though most banks limit how many checks you can write per month.

Money market accounts are useful if you want to earn interest on money you might need to access quickly, and you want the option to write checks or use a debit card without moving money to a separate checking account. The APY is usually competitive with high-yield savings accounts at online banks, though it varies. The tradeoff is that some banks charge monthly fees if your balance falls below a minimum, or charge per check if you exceed the monthly limit.

Read the fine print on any money market account before you open it. Some banks advertise a high APY but only pay that rate on balances above a certain threshold—say, $25,000. Below that, the rate drops significantly. Others charge $10 per check after you write more than a few per month. These details change the real return on your money.

How interest compounds and why time in the account matters

Interest does not just sit on top of your principal. Each time interest is credited to your account—usually daily or monthly—that interest itself starts earning interest. This is called compounding. Over time, compounding increases your total return more than straightforward interest would.

Here is a concrete example. You deposit $5,000 in a high-yield savings account earning 4.50% APY, compounded daily. After one year, you have $5,225.63. That extra $25.63 beyond the straightforward $225 came from interest earning interest on itself. After five years at the same rate, you have $6,197.20—the compounding effect grows larger the longer the money sits.

This is why leaving money untouched matters. Every withdrawal resets the compounding clock on that portion of your balance. If you deposit $5,000 and withdraw $2,000 after six months, the remaining $3,000 continues to compound, but you lost the compounding benefit on the $2,000 you removed. For money you know you will not need, a CD locks in the rate and forces you to leave it alone, maximizing the compounding effect.

Federal Reserve rate changes flow down to what banks offer you

The Federal Reserve sets a benchmark interest rate that influences what banks charge borrowers and what they pay savers. When the Fed raises its rate, banks typically raise the APY on savings accounts and CDs within weeks. When the Fed cuts its rate, banks cut savings rates too, though sometimes more slowly.

This means the 4.50% APY you see today might be 3.75% in six months if the Fed cuts rates. It also means if you locked money into a CD at 5.00% for one year, you are protected—that rate does not change even if the Fed cuts and savings accounts fall to 2.00%. That is the value of the CD may provide: you know exactly what you will earn, regardless of what happens in the broader economy.

Checking current rates before you deposit is important because the difference between banks is real money. Comparing three or four banks takes 15 minutes and can mean hundreds of dollars per year in additional interest on a large balance. Sites like Bankrate and DepositAccounts list current rates across many banks, updated daily.

Tax on interest income and how it affects your real return

Interest you earn on savings is taxable income. The bank will send you a 1099-INT form at the end of the year showing how much interest you earned, and you report that on your tax return. The interest is taxed at your ordinary income tax rate, not at a lower capital gains rate.

This means if you earn $450 in interest and your tax bracket is 22%, you owe roughly $99 in federal tax on that interest. Your real after-tax return is $351, not $450. This matters more on larger balances. A $100,000 balance earning 4.50% generates $4,500 in interest, but if you owe 22% tax, your after-tax gain is $3,510.

High-yield savings accounts still make sense even after tax because the rates are so much higher than traditional banks. But it is worth doing the math on your own situation. If you are in a high tax bracket and have a large balance, the after-tax return is lower than the advertised APY suggests. Some people keep emergency funds in high-yield savings and longer-term money in tax-advantaged retirement accounts where interest is not taxed annually.

Frequently Asked Questions

Can I lose money in a savings account or CD?

No. Savings accounts and CDs are insured by the Federal Deposit Insurance Corporation (FDIC) up to $250,000 per depositor per bank. Your principal is protected even if the bank fails. You can only lose money on a CD if you withdraw early and the early withdrawal penalty exceeds the interest you earned, which happens when rates have fallen sharply since you opened the CD.

What is the difference between APY and APR?

APY (annual percentage yield) includes the effect of compounding and shows what you actually earn. APR (annual percentage rate) does not include compounding and is used for loans and credit cards. For savings, always look at APY, not APR, because APY is the real number.

Should I put all my money in a CD or high-yield savings account?

It depends on when you might need the money. If you have an emergency fund, keep it in a high-yield savings account so you can access it without penalty. If you have money you will not touch for a year or more, a CD locks in a higher rate. Many people split the difference: emergency fund in high-yield savings, longer-term savings in CDs.

Do I have to pay fees on a high-yield savings account?

Most online banks do not charge monthly maintenance fees on high-yield savings accounts. Some traditional banks do charge fees if your balance falls below a minimum. Read the fee schedule before you open an account—a high APY does not matter if a $10 monthly fee eats into your interest earnings.

What happens to my interest rate if the Fed cuts rates?

Banks typically lower savings account and money market APYs within weeks of a Fed rate cut. CDs are protected—your rate stays the same for the full term. This is why CDs are valuable when rates are high and you expect them to fall, but less valuable when rates are already low.