Interest on a savings account is money the bank pays you for letting them use your deposits

When you put money in a savings account, the bank lends that money to other customers through mortgages, car loans, and credit cards. In exchange, the bank pays you a percentage of your balance as interest. That percentage is your interest rate, and it's expressed as an annual percentage rate (APR).

The bank calculates how much interest you earn based on three things: how much money you have in the account, what the interest rate is, and how long the money sits there. If you have $1,000 in an account earning 4% APR, you won't earn exactly $40 in a year—the actual amount depends on how often the bank compounds the interest (adds earned interest back into your balance so you earn interest on that interest too).

Interest rates on savings accounts vary widely. A traditional savings account at a large bank might pay 0.01% APR, while a high-yield savings account at an online bank might pay 4% to 5% APR. The difference between these two accounts on a $10,000 deposit is roughly $1 per year versus $400 to $500 per year.

Key Takeaways

  • Banks pay you interest because they use your deposits to make loans to other customers.
  • Your interest earnings depend on your account balance, the interest rate, and how often the bank compounds interest.
  • High-yield savings accounts typically pay 10 to 50 times more interest than traditional savings accounts at large banks.
  • Interest rates change over time and vary by bank, so comparing rates before opening an account matters.
  • You pay federal income tax on interest you earn, though the amount is usually small unless you have a large balance.

How banks calculate the interest you earn

Banks use one of two methods to calculate interest: simple interest or compound interest. Simple interest is calculated only on your original deposit. Compound interest is calculated on your original deposit plus any interest you've already earned.

Most savings accounts use daily compounding, which means the bank calculates interest every single day and adds it to your balance. That new balance then earns interest the next day. Over time, this compounds—you earn interest on your interest. The more frequently interest compounds, the more you earn, though the difference between daily and monthly compounding is usually small on a typical savings account balance.

Here's a concrete example: if you deposit $5,000 in an account earning 4% APR with daily compounding, you won't earn exactly $200 in a year. You'll earn slightly more because of compounding. The exact amount depends on the bank's specific compounding method, but you might earn around $204 to $205 instead.

Why interest rates differ between banks and account types

Large brick-and-mortar banks typically offer lower interest rates because they have higher operating costs—they maintain physical branches, employ more staff, and spend more on marketing. Online banks have lower overhead, so they pass some of those savings to customers through higher interest rates.

Money market accounts and certificates of deposit (CDs) often pay higher rates than regular savings accounts because you either keep a larger minimum balance or agree to leave the money untouched for a set period. Banks reward you for these restrictions by paying more interest.

Interest rates also move up and down based on what the Federal Reserve does. When the Fed raises its benchmark interest rate, banks typically raise the rates they pay on savings accounts. When the Fed lowers rates, bank rates usually fall too. This means the rate you see today might be different in three months.

The difference between APR and APY

APR (annual percentage rate) is the interest rate before compounding. APY (annual percentage yield) is the rate you actually earn after compounding is factored in. Banks are required to show you the APY when you open an account, because it's the more honest number—it shows what you'll actually make.

On high-yield savings accounts, the difference between APR and APY is usually small. If an account offers 4.5% APR with daily compounding, the APY might be 4.60%. On a $10,000 deposit, that's the difference between earning $450 and $460 over a year. On a traditional savings account earning 0.01% APR, the difference is negligible.

What happens to interest when you withdraw money

Most savings accounts calculate interest based on your daily balance. If you deposit $5,000 on the first of the month and withdraw $2,000 on the 15th, the bank calculates interest on $5,000 for 14 days and on $3,000 for the remaining days of the month. You earn less interest in months when you make withdrawals.

Some accounts have minimum balance requirements. If your balance drops below the minimum, you might lose the advertised interest rate or pay a monthly fee. Check your account terms before opening to understand what happens if your balance fluctuates.

Taxes on savings account interest

Interest you earn on a savings account is taxable income. The bank will send you a 1099-INT form at the end of the year if you earned $10 or more in interest, and you'll report that amount on your federal tax return. Some states also tax savings interest, though rules vary by state.

The tax impact is usually small. If you earned $200 in interest and you're in the 22% federal tax bracket, you'd owe about $44 in federal tax on that interest. But it's worth knowing that the interest isn't completely tax-free—your actual take-home earnings are slightly less than the interest amount shown in your account.

How to find accounts with higher interest rates

Comparing rates across banks takes about 15 minutes. Most online banks publish their current rates on their websites, and you can see several banks' rates side by side on financial websites that track savings rates. Look for the APY, not the APR, since APY shows what you'll actually earn.

When comparing, also check whether the rate is promotional (temporary) or standard. Some banks offer a higher rate for the first few months to attract new customers, then drop the rate significantly. Read the fine print to see when the rate changes and what the regular rate will be.

You don't need to chase the absolute highest rate if it means opening an account at a bank you don't trust or one with poor customer service. A difference of 0.5% APY on a $5,000 balance is $25 per year—worth considering, but not worth switching to a bank with bad reviews.

Frequently Asked Questions

Can I lose money in a savings account because of interest rates?

No. Interest rates can only add to your balance or stay flat—they cannot subtract from it. However, if inflation is higher than your interest rate, your money loses purchasing power over time. If you earn 1% interest but inflation is 3%, your money buys less than it did before, even though the account balance grew.

Is savings account interest the same as investment returns?

No. Savings account interest is may provide (up to FDIC insurance limits) and paid by the bank. Investment returns from stocks or bonds fluctuate and are not may provide. Savings accounts are safer but earn less over time; investments have more risk but historically earn more.

What's the highest interest rate I can find on a savings account right now?

Rates change frequently and vary by bank. As of early 2024, high-yield savings accounts at online banks typically pay between 4% and 5.5% APY, but this changes as the Federal Reserve adjusts its rates. Check current rates on financial websites that track them in real time.

Do I need a large balance to earn meaningful interest?

Interest is calculated on whatever balance you have, so even small balances earn something. A $1,000 balance at 4.5% APY earns about $45 per year. It's not life-changing, but it's better than earning $0.10 at a traditional bank. The more you save, the more interest compounds.

What happens to my interest if the bank lowers its rate?

The interest rate on your existing balance can change at any time unless you have a CD with a locked-in rate. Banks typically notify you before lowering rates, and you can move your money to another bank if the new rate is too low. This is why comparing rates periodically makes sense.