Banks lend out the money you deposit, and they share a portion of what they earn

When you put money into a savings account, the bank does not lock it in a vault with your name on it. Instead, the bank uses your deposit to make loans to other customers — mortgages, car loans, business loans, credit cards. The bank charges those borrowers interest. Your savings account interest is the bank's way of paying you for the right to use your money while you are not using it.

The bank keeps most of what it earns from lending. If a borrower pays the bank 6% interest on a mortgage, the bank might pay you 0.5% interest on your savings account. The difference — 5.5% — is the bank's profit on that transaction, minus their costs to run branches, pay employees, and cover loan defaults. Interest rates vary based on how much the bank needs deposits and what the Federal Reserve has set as its benchmark rate.

This arrangement benefits both sides. You earn money on savings you were not using anyway. The bank gets the capital it needs to lend. Without this system, banks would have no way to fund loans, and savers would have no way to earn returns on cash they keep safe.

Key Takeaways

  • Banks pay you interest because they lend out your deposits to other customers and share a portion of the interest those borrowers pay.
  • The interest rate you receive depends on the Federal Reserve's benchmark rate, how much the bank needs deposits, and the type of account you hold.
  • Banks keep most of the interest they collect from borrowers; your rate is typically much lower than what borrowers pay.
  • Interest rates on savings accounts change over time and vary between banks, so comparing rates before opening an account can increase your earnings.

How the Federal Reserve influences what banks pay you

The Federal Reserve sets a target federal funds rate — the interest rate at which banks lend money to each other overnight. This rate acts as a floor for all other interest rates in the economy. When the Fed raises its rate, banks have more incentive to pay higher rates on savings accounts to attract deposits. When the Fed lowers its rate, banks lower the rates they offer you.

The connection is not one-to-one. If the Fed raises its rate by 0.5%, your savings account rate might rise by 0.25% or not at all, depending on the bank's strategy. Banks that are desperate for deposits raise rates faster. Banks with plenty of deposits move slowly. This is why two banks can offer very different rates on the same day.

The Fed does not set your savings account rate directly — it influences the environment in which banks decide what to offer. Understanding this relationship helps explain why your rate changes without warning and why shopping around for a better rate is worth doing.

Why some accounts pay more interest than others

A high-yield savings account at an online bank might pay 4% to 5% annual interest, while a traditional bank down the street pays 0.01%. The difference comes down to overhead and competition. Online banks have no physical branches, no tellers, and lower staff costs. They can afford to pass more of their lending profits to depositors. Traditional banks with hundreds of branches have higher expenses and less pressure to compete on rate.

Account type also matters. Money market accounts sometimes pay higher rates than standard savings accounts because you agree to keep money in the account longer or accept limits on how often you can withdraw. Certificates of deposit (CDs) pay the highest rates because you lock your money away for a fixed term — three months, one year, five years — and the bank knows exactly how long it can lend that money out.

The trade-off is always the same: the longer you commit to leaving money untouched, or the fewer times you can access it, the higher the rate. Banks reward you for giving them stability and predictability.

How interest compounds and grows your balance

Interest does not just sit on top of your balance. Most savings accounts use compound interest, meaning the bank calculates interest on your original deposit plus all the interest you have already earned. If you deposit $1,000 at 4% annual interest compounded monthly, after one month you earn about $3.33. The next month, you earn interest on $1,003.33, not just the original $1,000.

Over time, this effect accelerates. After one year at 4% compounded monthly, your $1,000 grows to about $1,040.74 — slightly more than simple 4% would give you. After five years, the difference becomes more noticeable. After ten years, compound interest has added hundreds of dollars to an account that started with just $1,000.

The frequency of compounding matters. Daily compounding grows your money faster than monthly compounding, which grows faster than annual compounding. Most online banks compound daily. Some traditional banks compound quarterly or annually. Check the account details before opening to see how often interest is calculated.

What happens to interest rates during economic changes

Interest rates move in response to inflation and economic conditions. When prices are rising fast (inflation), the Federal Reserve typically raises its benchmark rate to cool down the economy. This usually means higher rates for savers. When the economy slows and inflation falls, the Fed lowers rates, and savings account rates drop with them.

During the period from 2020 to 2022, savings account rates were near zero because the Fed kept rates low to support the economy during the pandemic. Starting in 2023, the Fed raised rates aggressively to fight inflation, and savings account rates jumped to 4% and higher at competitive banks. By 2024, rates had stabilized but remained higher than the decade before.

These swings are normal and unpredictable. You cannot time the market to lock in the best rate. What you can do is monitor your current rate and move your money if a better option appears. Many savers keep some money in a high-yield savings account specifically because rates can change and they want to benefit when rates rise.

The difference between savings account interest and investment returns

Savings account interest is may provide (up to the FDIC insurance limit of $250,000 per account). You know exactly what you will earn. If your account pays 4% annually, you will earn 4% on your balance, assuming rates do not change. This safety comes at a cost: the return is modest compared to stocks, bonds, or other investments.

Investments like stocks or mutual funds can earn much higher returns — 8%, 10%, or more in good years — but they can also lose value. A savings account will never lose money due to market conditions. This is why savings accounts are for money you need to keep safe and accessible, while investments are for money you can afford to risk and do not need for years.

The interest you earn on a savings account is also taxable income. If you earn $100 in interest, you owe federal income tax on that $100 (and possibly state income tax, depending on where you live). This reduces your real return slightly, though the amount is usually small unless you have a very large balance or a very high rate.

How to find and compare savings account rates

Rates change frequently, so the best way to find current options is to check financial websites that track savings rates across banks — sites like Bankrate, DepositAccounts, or the Federal Reserve's own resources. These sites let you filter by account type, sort by rate, and see which banks are currently offering the best terms.

When comparing, look at three things: the annual percentage yield (APY), the compounding frequency, and any minimum balance requirements. APY already includes the effect of compounding, so it is the number to compare directly between banks. A $0 minimum is better than a $25,000 minimum if you have less to deposit. Some banks waive minimums if you set up automatic transfers.

Once you open an account, set a reminder to check rates every few months. If your current bank's rate falls significantly behind competitors, moving your money takes minutes. Most online banks can transfer funds from your old account automatically, and the FDIC insurance follows your money to the new bank.

Frequently Asked Questions

Do I have to pay taxes on savings account interest?

Yes. Interest earned on a savings account is taxable income at both the federal and state level (in most states). The bank will send you a 1099-INT form in January if you earned $10 or more in interest during the year. You report this on your tax return. The tax owed depends on your overall income and tax bracket.

Can a bank lower my interest rate without warning?

Yes. Banks can change savings account rates at any time without notice. Most do notify customers, but they are not required to. If your rate drops significantly, you can move your money to a different bank. There is no penalty for closing a savings account and opening one elsewhere.

What is the difference between APY and interest rate?

The interest rate is the percentage the bank pays on your balance. APY (annual percentage yield) is the interest rate plus the effect of compounding over one year. If compounding happens daily, APY will be slightly higher than the stated rate. Always compare APY when looking at different accounts.

Is my interest may provide if rates drop?

No. Savings account rates are variable, meaning they can change at any time. If you want a may provide rate, you need a certificate of deposit (CD), where the rate is locked in for the entire term. The trade-off is that you cannot access the money without a penalty.

How much interest will I earn on $10,000?

It depends on the rate and how long you keep the money in the account. At 4% APY compounded daily, $10,000 earns about $408 in one year. At 0.5% APY, it earns about $50. The difference between banks can be hundreds of dollars per year on the same balance, which is why comparing rates matters.