Banks lend out your deposit and share a portion of what they earn

A high yield savings account makes money the same way any savings account does: the bank takes the money you deposit, lends it to other customers as mortgages, car loans, and business credit lines, and then pays you a fraction of the interest those borrowers pay back. The difference is that high yield accounts pay you a larger fraction—currently between 4% and 5.35% annually, depending on the bank and the exact day you check—while traditional savings accounts at big banks often pay less than 0.01%.

The bank keeps the spread. If a borrower pays the bank 7% interest on a mortgage and you earn 5% on your savings account, the bank pockets roughly 2%. That gap is how banks cover their operating costs, pay employees, and generate profit. When interest rates rise (set by the Federal Reserve), banks can charge borrowers more, which means they can afford to pay depositors more without shrinking their margin. When rates fall, banks lower what they pay you.

You do not need to do anything to earn this interest. The bank calculates it daily based on your balance and deposits it into your account monthly, though some banks compound it more frequently. The interest is taxable income—you will receive a 1099-INT form at the end of the year if you earn $10 or more.

Key Takeaways

  • Banks pay you interest because they lend out your deposit to other customers and share part of what those borrowers pay them.
  • High yield savings accounts currently pay between 4% and 5.35% annually, while traditional bank savings accounts typically pay under 0.01%.
  • The bank keeps the difference between what it charges borrowers and what it pays you, which covers its costs and profit.
  • Interest is calculated daily and deposited monthly, and you owe federal income tax on any interest you earn.
  • When the Federal Reserve raises rates, banks can afford to pay you more; when rates fall, banks lower your rate.

Why high yield accounts pay more than traditional savings

High yield savings accounts are almost always offered by online banks or credit unions, not by the large brick-and-mortar banks you see on Main Street. Online banks have lower overhead—no branch buildings, fewer employees, no teller windows—so they can afford to pass more of their lending profit to depositors. A bank like Ally or Marcus operates from a handful of data centers and a small corporate office, whereas Chase or Bank of America maintains thousands of physical locations.

Competition also matters. Online banks compete almost entirely on interest rate because they cannot offer you a physical location or a relationship manager. If one online bank raises its rate to 5.2%, others follow within days or lose customers. Traditional banks compete on convenience and brand recognition, so they have less pressure to raise rates on savings accounts.

The Federal Reserve's benchmark interest rate—the rate at which banks lend to each other overnight—also sets the ceiling for what banks can afford to pay you. When that rate is high, banks earn more on their lending and can pay depositors more. When it is low, they cannot. The Fed raised rates aggressively from 2022 through 2023, which is why high yield accounts jumped from paying under 1% to paying over 5%. If the Fed cuts rates in the future, high yield rates will fall with them.

How your balance grows month to month

Interest on a high yield savings account compounds, meaning you earn interest on your interest. If you deposit $10,000 at 5% annual percentage yield (APY), the bank calculates your interest daily. On day one, you earn roughly $0.14 (5% divided by 365 days). That $0.14 is added to your balance. On day two, you earn interest on $10,000.14, not just $10,000. Over a month, this compounds into roughly $41.67 in interest. Over a year, it reaches $500.

The exact amount depends on the APY the bank is currently offering and whether you deposit or withdraw money during the month. If you deposit an additional $5,000 on day 15, you earn interest on the full $15,000 for the remaining 16 days of the month. If you withdraw $2,000, your interest calculation drops for the days after the withdrawal.

Most banks calculate interest daily but deposit it monthly. Some deposit it more frequently—weekly or even daily—which means your money starts earning interest on the interest sooner. The difference is small (usually a few dollars per year on a $10,000 balance), but it adds up over time and across larger balances.

The relationship between Federal Reserve rates and what you earn

The Federal Reserve does not set the exact rate your bank pays you. Instead, it sets the federal funds rate, which is the interest rate at which banks lend reserve balances to each other overnight. This rate influences all other interest rates in the economy, including what banks charge borrowers and what they pay savers.

When the Fed raises the federal funds rate, banks can charge borrowers more for mortgages and loans. This means banks earn more on their lending portfolio, so they can afford to pay depositors higher rates without cutting into profit. When the Fed cuts the federal funds rate, the opposite happens: banks earn less on lending, so they lower what they pay savers.

The lag between a Fed rate change and a change to your account's rate is usually one to three weeks. Some banks move faster to attract new deposits; others move slower to keep costs down. If you are shopping for a high yield account, check the current rate at multiple banks before depositing, because rates can differ by 0.5% or more, and that difference compounds significantly over time.

What happens to your interest if rates fall

High yield savings accounts have no rate floor, meaning the bank can lower your rate to nearly zero if the Fed cuts rates and keeps them low for years. This happened after 2008, when the federal funds rate stayed near zero for seven years. High yield accounts that had paid 3% to 4% dropped to 0.01% or lower, and many savers moved their money to CDs or money market funds to lock in higher rates before they disappeared.

You have no contractual right to a specific rate on a savings account. The bank can change your rate at any time with notice (usually 30 days, though some banks give less). You are not locked in the way you would be with a certificate of deposit (CD), where the rate is fixed for the entire term.

If rates fall and your high yield account rate drops, you can move your money to a different bank offering a higher rate, or you can move it into a CD to lock in the current rate for a set period (usually three months to five years). Some savers keep part of their emergency fund in a high yield savings account for liquidity and move the rest into CDs at different maturity dates to hedge against falling rates.

FDIC insurance and how it affects what banks can pay

Every deposit you hold at an FDIC-insured bank is protected up to $250,000 per depositor, per bank, per account type. This insurance is funded by banks themselves, not by taxpayers. Because the FDIC guarantees your money, banks can borrow from depositors at lower rates than they could if deposits were uninsured. This safety net is part of why banks can afford to pay you interest at all—they know you will not panic and withdraw your money during a market downturn.

The FDIC insurance limit affects how much you should deposit at any single bank. If you have $500,000 in savings, you could deposit $250,000 at one bank and $250,000 at another to stay fully insured. Some savers use multiple banks specifically to maximize FDIC coverage while earning high yields across several accounts.

The cost of FDIC insurance is built into the bank's operating expenses, so it indirectly affects the rate the bank can afford to pay you. A bank with higher insurance costs (because it has riskier lending practices or a higher failure risk) may pay slightly less than a bank with lower costs. In practice, this difference is small and invisible to you—the bank absorbs it rather than passing it to depositors.

Frequently Asked Questions

Do I have to pay taxes on the interest I earn?

Yes. Interest from a savings account is taxable income at your ordinary income tax rate. If you earn $500 in interest and you are in the 24% tax bracket, you owe roughly $120 in federal tax on that interest. The bank will send you a 1099-INT form in January if you earned $10 or more during the year. You report this on your tax return.

Can a bank lower my interest rate without warning?

A bank can lower your rate with notice, usually 30 days. You will receive a notice by mail or email before the change takes effect. You are not locked into a rate the way you are with a CD. If your rate drops and you do not like it, you can move your money to another bank.

What is the difference between APY and interest rate?

APY (annual percentage yield) includes the effect of compounding, while the interest rate does not. A bank might quote you a 5% interest rate that compounds daily, which equals roughly 5.13% APY. Banks are required to show you the APY so you can compare accounts fairly across different compounding schedules.

If rates fall to zero, will I lose money?

No. Your balance will never shrink because of interest rates. At worst, your rate will drop to 0.01% or lower, and you will earn almost nothing. Your principal—the money you deposited—is always yours and is protected by FDIC insurance. You only lose money if you withdraw it or if the bank fails (which is extremely rare for FDIC-insured banks).

Why do some banks pay more than others if they all use the same Federal Reserve rate?

Banks have different operating costs, different lending strategies, and different competitive pressures. An online bank with low overhead can afford to pay more than a large traditional bank. A bank trying to grow deposits quickly may pay more than a bank that is not actively recruiting new customers. Shop around—the difference between 4.5% and 5.3% is significant over time.