What you earn depends on the rate your bank sets and how much money you keep in the account

Savings account interest is money your bank pays you for letting them hold your deposits. The amount you earn each month or year depends on two things: the interest rate the bank offers, and the balance you maintain. A bank might offer 4.5% annual interest, but that rate applies only to the money sitting in the account—if you have $1,000 deposited, you earn roughly $45 per year at that rate. If you have $10,000, you earn roughly $450.

Interest rates vary widely. Online banks often pay higher rates than brick-and-mortar banks because they have lower overhead costs. As of early 2024, online savings accounts range from under 0.01% at some traditional banks to 4.5% or higher at competitive online institutions. The Federal Reserve's decisions about interest rates affect what banks can afford to pay, so rates change over time—sometimes weekly. A rate that is competitive today may not be in six months.

Banks calculate interest in different ways. Most use daily compounding, meaning they calculate what you owe interest on each day, then add that interest to your balance so you earn interest on the interest. Some use monthly or annual compounding, which earns you less. The difference is small on modest balances but grows with larger sums and higher rates.

Key Takeaways

  • Your earnings equal the interest rate multiplied by your account balance, so a 4% rate on $5,000 earns roughly $200 per year.
  • Online banks typically offer rates two to four times higher than traditional banks because they spend less on physical branches.
  • Interest rates change frequently and are set by individual banks, not by the government, so you should check your bank's current rate rather than assume it matches what you saw last month.
  • Daily compounding earns you slightly more than monthly or annual compounding because interest gets added to your balance and then earns interest itself.
  • The Federal Reserve's benchmark rate influences what banks pay, but banks are free to offer less—some offer nearly nothing even when rates are high.

How the math works: calculating your annual earnings

The basic formula is straightforward: multiply your balance by the annual interest rate. If you have $2,000 in an account earning 4.5% annually, you earn $90 per year ($2,000 × 0.045 = $90). Divide by 12 to find the monthly amount: roughly $7.50 per month.

That calculation assumes your balance stays the same all year. In reality, most people deposit and withdraw money, so the bank calculates interest on your average daily balance or your balance on specific days. If you deposit $2,000 on January 1 and withdraw $500 on June 1, the bank tracks what you had each day and uses that to compute interest. Some banks use the lowest balance during the month, which penalizes you for dipping below a threshold. Read your account agreement to see which method your bank uses.

Compounding makes the math slightly more complex but works in your favor. With daily compounding at 4.5%, you do not earn exactly $90 on $2,000—you earn about $91.89, because the small amount of interest added each day then earns interest itself. The difference grows larger with bigger balances and higher rates, but on typical savings account balances it amounts to a few dollars per year.

Why rates differ so much between banks

The same Federal Reserve rate does not mean all banks pay the same interest. The Fed sets a benchmark rate that influences what banks charge each other for short-term loans, but banks decide independently what to pay depositors. A bank might offer 4.5% while another offers 0.01%, even when the Fed's rate is identical.

Online banks pay more because they operate with fewer expenses. They have no tellers, no branch buildings, no regional staff. That lower cost structure means they can afford to pass more of their earnings to depositors. Traditional banks with hundreds of branches have higher costs and often pay less interest, even though they may charge lower fees or offer other perks like in-person service.

Competition also matters. When many online banks offer similar high rates, they attract deposits from each other's customers. When rates are low across the board, banks have less incentive to compete on interest. The rate you see today may drop in a few months if the Fed lowers its benchmark rate or if a bank decides to reduce what it pays.

How often interest gets added to your account

Banks calculate interest daily but add it to your account on different schedules. Most add interest monthly, on the last day of the month or on a set date. Some add it quarterly or annually. Check your account agreement or ask your bank when interest posts.

The posting schedule matters if you are watching your balance closely, but it does not change your total annual earnings. Whether interest is added on the 1st or the 28th of each month, you earn the same amount over a full year. What matters more is whether the bank uses daily compounding (which earns you slightly more) or monthly compounding (which earns you slightly less).

Once interest posts, it becomes part of your balance and earns interest itself in the next period. This is why compounding accelerates your growth over time, especially if you leave the money untouched for years.

Comparing rates across banks and accounts

To find the highest rate, search for "high-yield savings account" or "savings account rates" and compare current offers. Websites like Bankrate, DepositAccounts, and NerdWallet list rates from multiple banks and update them frequently. The rates change often, so a comparison from last month may not reflect what banks offer today.

When comparing, look at the full picture, not just the rate. Some banks offer high rates only on balances above a certain threshold—say, 4.5% on balances over $100,000 but 0.01% on smaller amounts. Others offer a promotional rate for the first few months, then drop it. Read the fine print to see whether the rate applies to your balance size and whether it is permanent or temporary.

Also check whether the bank is FDIC-insured. This means the federal government guarantees your deposits up to $250,000 if the bank fails. Most legitimate banks are FDIC-insured, but it is worth confirming before you move money. A slightly lower rate at an FDIC-insured bank is safer than a higher rate at an uninsured institution.

What happens to your interest if rates drop

If the Federal Reserve lowers its benchmark rate, banks typically lower the interest they pay on savings accounts within days or weeks. Your rate is not locked in—it floats with the market. If you are earning 4.5% and rates drop to 2%, your bank will likely reduce your rate to match the new market conditions.

This is why it pays to shop around periodically. If your current bank drops its rate but competitors are still offering higher rates, you can move your money to a new bank. There is no penalty for switching savings accounts—you straightforward withdraw from one bank and deposit at another. The process takes a few business days, and your FDIC insurance follows you to the new bank.

Conversely, if rates rise, your bank may not raise your rate as quickly as competitors do. Banks are slower to increase what they pay depositors than to decrease it. If you notice your rate has not moved while other banks have raised theirs, that is a signal to consider switching.

How taxes affect what you actually keep

Interest earned in a savings account is taxable income. If you earn $500 in interest during a year, you owe federal income tax on that $500. Your bank will send you a 1099-INT form by January 31 reporting the interest you earned, and you report it on your tax return.

The tax you owe depends on your overall income and tax bracket. If you are in the 22% tax bracket and earn $500 in interest, you owe roughly $110 in federal tax on that interest. State taxes may explore as well, depending on where you live. This means your actual take-home earnings are lower than the interest rate suggests.

High-yield savings accounts still come out ahead because the interest rate is high enough that even after taxes, you earn more than you would at a traditional bank. But it is worth factoring taxes into your calculation when comparing accounts or deciding how much to keep in savings versus other investments.

Frequently Asked Questions

How much interest will I earn on $10,000 in a savings account?

At a 4.5% annual rate, you would earn roughly $450 per year, or about $37.50 per month. At a 0.01% rate, you would earn about $1 per year. The actual amount depends on the specific rate your bank offers and whether your balance stays at $10,000 or changes during the year.

Do I need a minimum balance to earn interest?

Most online banks pay interest on any balance, even $1. Some traditional banks require a minimum balance—often $500 to $2,500—to earn interest or to avoid a monthly fee. Check your account agreement or ask your bank about minimum balance requirements.

Can I lose money in a savings account?

No. A savings account cannot have a negative balance due to interest. The bank pays you interest; you do not pay the bank. You can lose purchasing power if inflation rises faster than your interest rate, but your account balance itself will not decrease from interest.

What is the difference between APY and APR on a savings account?

APY (annual percentage yield) includes the effect of compounding, while APR (annual percentage rate) does not. Banks are required to show you the APY, which is the number that matters for savings accounts. APR is used mainly for loans. Always compare APY when shopping for savings accounts.

Should I move my money if my bank lowers its rate?

If your bank's rate drops significantly below what competitors offer, moving your money can earn you hundreds of dollars per year on a large balance. The process takes a few days and has no penalty. If the rate difference is small, staying put may be simpler, but it is worth checking what other banks offer at least once a year.