Banks pay interest on savings accounts by lending out the money you deposit and sharing a portion of what they earn with you

When you deposit money into a savings account, the bank doesn't lock it in a vault with your name on it. Instead, the bank lends that money to other customers through mortgages, car loans, and business lines of credit. The borrowers pay the bank interest on those loans. The bank keeps most of that interest as profit, but it pays you a portion of it—your savings account interest—as compensation for letting them use your money.

The amount of interest you earn depends on three things: how much money you have in the account, the interest rate the bank offers, and how long the money sits there. Banks set their own rates based on what the Federal Reserve does with its benchmark rate, how much competition exists in your area, and how much they need deposits at that moment. When the Federal Reserve raises its rates, banks typically raise savings rates within weeks or months. When the Fed cuts rates, banks often cut savings rates faster.

Interest compounds, meaning you earn interest on your interest. If you have $1,000 earning 4% annual interest and you don't withdraw anything, after one year you'll have $1,040. In year two, you earn 4% on $1,040, not just the original $1,000. Over time, compounding makes a real difference, especially with higher rates and longer time periods.

Key Takeaways

  • Banks pay you interest because they lend out your deposits to other customers and share part of the profit with you.
  • Your interest rate depends on the Federal Reserve's rate, the bank's own decisions, and how much competition exists in your market.
  • Interest compounds regularly—usually daily or monthly—so you earn returns on money you've already earned.
  • The bank tells you the Annual Percentage Yield (APY), which accounts for compounding and shows what you'll actually earn in a year.
  • Online banks typically offer higher rates than brick-and-mortar banks because they have lower operating costs.

How the Federal Reserve's Rate Affects What Your Bank Pays You

The Federal Reserve sets a target range for the federal funds rate—the interest rate banks charge each other for overnight loans. This rate doesn't directly set your savings rate, but it acts as a ceiling and floor for what banks will offer. When the Fed raises its target range, banks have more room to raise what they pay depositors. When the Fed cuts rates, banks cut savings rates, often within days.

The relationship isn't one-to-one. If the Fed raises rates by 0.5%, your bank might raise your savings rate by 0.4% or 0.6%, depending on how much they need deposits and how much they're earning on loans. During periods when the Fed is raising rates steadily, savings rates tend to climb. During periods when the Fed is cutting, savings rates fall faster than the Fed's cuts because banks want to keep more of their profit.

You can track the Fed's current rate on the Federal Reserve's website. Knowing where rates are heading helps you understand whether your bank's rate is likely to go up or down in the coming months.

Annual Percentage Yield (APY) Versus the Stated Interest Rate

Banks must show you two numbers: the interest rate and the Annual Percentage Yield, or APY. The interest rate is what the bank pays on your balance. The APY is the real return you'll get in a year after compounding is factored in.

For example, a bank might advertise a 4.5% interest rate compounded daily. Because interest compounds daily, your actual annual return is slightly higher—maybe 4.60% APY. The difference grows larger with higher rates and more frequent compounding. Banks are required by law to show you the APY prominently, so always compare APY between banks, not the stated rate.

When you're shopping for a savings account, the APY is the number that matters. It tells you exactly what you'll earn in a year if you deposit money and leave it untouched.

How Often Banks Pay Interest and When You See It in Your Account

Banks compound interest at different intervals: daily, monthly, or quarterly. Daily compounding is most common and works in your favor because you earn interest on your interest more frequently. The bank calculates how much you've earned each day, adds it to your balance, and then calculates the next day's interest on the new, higher balance.

You typically see the interest posted to your account monthly, though some banks post it daily or quarterly. "Posted" means the interest actually appears in your balance and becomes yours to keep. Until interest is posted, it's just a calculation. Once it's posted, you own it and can withdraw it if you want.

Some banks also offer promotional rates for new accounts—higher APY for the first few months or if you meet a deposit minimum. These rates are temporary and will drop to the bank's standard rate after the promotion ends. Read the fine print to see when the promotional period ends and what the regular rate will be.

Why Different Banks Pay Different Rates on the Same Type of Account

Two banks in the same city might offer 4.0% APY and 2.5% APY on identical savings accounts. The difference comes down to business strategy and cost structure. Online banks with no physical branches have lower overhead costs, so they can afford to pay depositors more and still make a profit. They're competing for your money by offering better rates.

Large national banks with thousands of branches have higher operating costs. They often pay lower rates because they rely on brand recognition and convenience rather than rate competition. They assume many customers will stay with them even if another bank pays more.

Credit unions, which are member-owned rather than shareholder-owned, sometimes pay higher rates because they return profits to members instead of shareholders. However, credit unions have membership requirements and may have lower deposit limits.

The Federal Reserve's current rate environment also affects how aggressively banks compete. When rates are rising, banks compete harder to attract deposits because they can lend money at higher rates and make more profit. When rates are falling or stable, competition may soften and rates may stagnate.

What Happens to Your Interest If You Withdraw Money Early

Regular savings accounts have no penalty for withdrawals, so you can take money out anytime without losing interest you've already earned. The interest you've earned up to the day of withdrawal is yours. Interest stops accruing the moment you withdraw the funds.

Certificates of Deposit (CDs), which are a different product, do have early withdrawal penalties. If you withdraw from a CD before the maturity date, the bank deducts a penalty from your interest earnings or principal. The penalty amount varies by bank and CD term—a 12-month CD might have a 3-month interest penalty, meaning you lose three months' worth of interest if you withdraw early.

Money Market Accounts, another savings product, may have limits on how many withdrawals you can make per month before penalties kick in. Check your account agreement to see whether your account has withdrawal limits or penalties.

How Inflation Affects What Your Interest Actually Buys You

Interest rates and inflation are connected. If inflation is 3% and your savings account pays 4% APY, your money is growing faster than prices are rising—you're gaining purchasing power. If inflation is 5% and your account pays 4%, you're losing purchasing power even though you're earning interest. Your balance grows, but it buys less.

This matters because it affects how much your savings are actually worth over time. A 4% rate sounds good until inflation is 6%. In that scenario, you're effectively losing 2% of your purchasing power each year, even though your account balance is growing.

You can't control inflation, but you can control where you keep your money. When rates are high relative to inflation, keeping money in a savings account makes sense. When inflation is much higher than savings rates, you might explore other options like short-term CDs or money market funds, though those carry different risks and aren't insured the same way.

Frequently Asked Questions

Do I have to pay taxes on savings account interest?

Yes. Interest income is taxable as ordinary income. Banks report interest over $10 to the IRS on a 1099-INT form, and you report it on your tax return. The tax rate depends on your overall income and tax bracket. Interest earned in a regular savings account is taxed in the year it's earned, even if you don't withdraw it.

What's the difference between a savings account and a money market account?

Money market accounts often pay slightly higher interest but may require a larger minimum balance and limit how many withdrawals you can make per month. Savings accounts are more flexible—you can withdraw anytime without penalty. Both are FDIC-insured up to $250,000. Choose based on whether you need frequent access to the money.

Can I lose money in a savings account?

No, as long as the bank is FDIC-insured. Your deposits are protected up to $250,000 per account type per bank. You won't lose principal, but inflation can reduce what your money buys. Interest rates can also fall, so the rate you earn today may be lower next year.

Why did my bank lower my interest rate?

Banks lower rates when the Federal Reserve cuts its benchmark rate or when they need fewer deposits. If you're earning less than other banks offer, you can move your money to a bank with a higher rate. There's no penalty for switching banks with a regular savings account.

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

It depends on the APY and how long you keep the money in the account. At 4% APY, $10,000 earns $400 in one year. At 2% APY, it earns $200. Use the bank's interest calculator or multiply your balance by the APY to estimate your earnings. Remember that compounding means you'll earn slightly more than a straightforward multiplication suggests.