What you earn depends on the bank's rate and how much you have saved

The amount of interest a savings account pays you depends on two things: the annual percentage yield (APY) the bank offers, and how much money sits in your account. A bank paying 4.5% APY will pay you more interest than one paying 0.01% APY — but only if you leave your money there long enough for the interest to add up.

The interest compounds, which means you earn interest on your interest. If you deposit $1,000 and never touch it, the bank calculates interest on $1,000 the first month. The next month, it calculates interest on $1,000 plus whatever interest you earned — so you earn slightly more. This compounds monthly, daily, or yearly depending on the bank's rules.

Right now, savings account rates vary widely. Some banks offer rates between 4% and 5% APY, while others offer less than 0.1% APY. The difference matters: on $10,000, a 4.5% rate earns roughly $450 per year, while a 0.01% rate earns about $1 per year.

Key Takeaways

  • Your interest earnings equal the bank's APY multiplied by your account balance, though the exact amount depends on how often the bank compounds interest.
  • Banks that advertise higher APY rates — typically online banks — currently pay more than traditional brick-and-mortar banks, though rates change regularly.
  • Interest compounds, meaning you earn interest on the interest you already earned, so leaving money untouched longer increases your total earnings.
  • The bank must disclose its APY and compounding frequency in writing before you open the account, so you can compare offers side by side.

How the math works: calculating your interest

To estimate what you'll earn, multiply your account balance by the APY and divide by 12 if you want a monthly estimate. A $5,000 balance at 4.5% APY earns roughly $187.50 per year, or about $15.63 per month before compounding is factored in.

The actual amount will be slightly higher because of compounding. If the bank compounds daily, you earn interest on a slightly larger balance each day. If it compounds monthly, the effect is smaller. The bank's disclosure document — called the Truth in Savings Act form — will tell you exactly how often it compounds.

You don't have to do this math yourself. Most banks show you an estimate when you open the account, and your online banking dashboard usually displays how much interest you've earned so far in the current month or year.

Why rates differ so much between banks

Online banks typically offer higher APY rates than banks with physical branches. This is because online banks have lower overhead costs — they don't pay for buildings, tellers, or as many staff members. They pass some of those savings to customers through higher interest rates.

Traditional banks with branches often offer lower rates because they have more expenses. They also may not need to compete as aggressively for deposits because customers value the ability to walk in and speak to someone in person.

Rates also change based on what the Federal Reserve does. When the Fed raises its benchmark interest rate, banks tend to raise savings account rates. When the Fed lowers rates, banks usually lower their rates too. This means the APY you see today may be different in three months.

How to find the current rates banks are offering

You can compare rates by visiting banks' websites directly or using rate comparison sites. Look for the APY figure, not just the "interest rate" — APY includes the effect of compounding and is the true number to compare.

When you find a rate you want, read the fine print. Some banks offer a high rate only on balances above a certain amount, or only for the first few months. Others offer the advertised rate to all customers on all balances. The disclosure form will spell out any conditions.

Remember that rates change. A bank offering 4.8% today might drop to 4.2% next month. If you want to lock in a higher rate, you may want to open the account sooner rather than later, but don't rush into a bank that doesn't meet your other needs just for a slightly higher rate.

What happens to your interest if you withdraw money early

If you withdraw money before the end of the month or year, the bank calculates interest only on the balance you kept in the account. For example, if you deposit $5,000 on January 1 and withdraw $3,000 on January 15, the bank calculates interest for January on roughly $4,000 (the average balance), not $5,000.

Some savings accounts have no withdrawal limits and no penalties for taking money out. Others limit you to a certain number of withdrawals per month. Check the account rules before you open it if you think you might need to access the money frequently.

The difference between savings accounts and money market accounts

Money market accounts often pay slightly higher interest than savings accounts, but they usually require a larger minimum balance and limit your withdrawals. If you have a large sum and won't need to touch it often, a money market account might earn you more.

Certificates of deposit (CDs) lock your money away for a set time — three months, one year, five years — and pay a fixed rate for that entire period. CDs usually pay more than savings accounts because the bank knows it can use your money for longer. But if you withdraw before the CD matures, you pay a penalty.

For most people starting out, a regular savings account with no withdrawal limits and a competitive APY is the simplest choice. You can move to a money market account or CD later if your situation changes.

Frequently Asked Questions

Is the interest I earn taxable?

Yes. Interest earned in a savings account is considered income by the IRS. At the end of the year, the bank sends you a Form 1099-INT showing how much interest you earned, and you report it on your tax return. The amount is usually small unless you have a large balance or a very high APY.

Can a bank lower my interest rate after I open the account?

Yes. Banks can change savings account rates at any time. They must notify you before the change takes effect, usually by email or mail. If you don't like the new rate, you can move your money to a different bank.

What if I add money to my savings account during the year?

The bank calculates interest on whatever balance you have each day. If you deposit $2,000 in January and $3,000 in June, you earn interest on $2,000 for those first five months, then on $5,000 for the rest of the year. The more you have saved, the more interest you earn.

Do I need a minimum balance to earn interest?

It depends on the bank. Some banks pay interest on any balance, no matter how small. Others require a minimum balance — often $500 or $1,000 — and pay no interest if your balance falls below that. Check the account rules before you open it.