Banks pay interest by calculating a percentage of your balance and depositing it into your account on a set schedule

Interest is money the bank pays you for letting them hold your deposit. The bank lends your money to other customers and businesses, keeps most of what they earn, and gives you a small cut. The amount you receive depends on three things: how much money you have in the account, the interest rate the bank offers, and how often the bank compounds the interest (calculates and adds it back to your balance).

Most savings accounts pay interest monthly, though some pay quarterly or annually. The bank calculates your interest based on your average daily balance during that period. If you have $1,000 in the account for the entire month and the bank offers 4% annual interest, you would earn roughly $3.33 that month (4% divided by 12 months). The next month, the bank calculates interest on $1,003.33 because the previous interest was added to your balance — this is called compounding.

You do not have to do anything to receive interest. Once you open a savings account that earns interest, the bank handles the calculation and deposit automatically. Your account statement or online banking portal will show each interest payment as a deposit labeled "interest paid" or "interest earned."

Key Takeaways

  • Interest rates on savings accounts vary widely by bank and account type, ranging from nearly 0% at some large banks to 4% or higher at online banks and credit unions.
  • High-yield savings accounts and money market accounts typically pay more interest than standard savings accounts at the same bank.
  • The interest rate can change at any time, so the rate you see today may be lower or higher next month.
  • Compounding means interest earns interest, so your balance grows faster the longer money sits in the account.
  • You can compare rates across banks using your bank's website or third-party rate comparison tools before opening an account.

Why interest rates differ between banks and account types

Large national banks often pay very low interest rates — sometimes 0.01% or less — because they have many customers and do not need to attract deposits with high rates. Online banks and credit unions typically pay much higher rates, sometimes 4% to 5% or more, because they have lower overhead costs and compete for deposits by offering better terms.

Within a single bank, different account types earn different rates. A standard savings account might pay 0.05%, while the same bank's high-yield savings account pays 4.50%. Money market accounts usually pay rates between regular savings and high-yield savings. Certificates of deposit (CDs) often pay the highest rates because you agree to leave your money untouched for a fixed period — three months, one year, five years, or longer.

The Federal Reserve's interest rate decisions also affect what banks offer. When the Fed raises its benchmark rate, banks typically raise the rates they pay on savings accounts within weeks or months. When the Fed cuts rates, bank rates usually fall as well. This means the rate you lock in today may not be the rate you earn next year.

How to find accounts with higher interest rates

Start by checking what your current bank pays. Log into your online banking portal or call the customer service number on the back of your debit card and ask for the current interest rate on your savings account. Write down the rate and the account type.

Then compare that rate to what other banks offer. Visit the websites of online banks like Marcus, Ally, American Express Personal Savings, or Discover Bank — these typically publish their current rates on the homepage. Credit unions often pay competitive rates too; you can search for credit unions in your area using the CO-OP Network or Alliant Credit Union's locator tools.

Use rate comparison websites like Bankrate, DepositAccounts, or DepositAccounts.com to see rates across multiple banks at once. These sites update rates frequently and let you filter by account type and minimum balance requirements. Keep in mind that the rates shown are current as of the date listed, and banks change rates regularly.

What happens when you move money to a higher-rate account

If you find an account with a better rate, you can transfer your savings without losing any money or interest already earned. The interest you have already received stays in your account. You will not owe taxes on the transfer itself — only on the interest income when you file your tax return.

To move money, you can set up an external transfer through your new bank's website (you will need your old account number and routing number), or you can withdraw the money and deposit it at the new bank. External transfers usually take three to five business days. Some banks offer a one-time wire transfer or ACH transfer for free; others charge a small fee.

Your old bank will continue to pay interest on any balance that remains until you close the account. Once you close it, no more interest accrues. If you close the account before the end of the month, you may still receive interest for that month, depending on the bank's policy.

Understanding compounding and how it affects your balance over time

Compounding is the process of earning interest on your interest. If you deposit $10,000 in an account earning 4% annual interest compounded monthly, the bank calculates one-twelfth of 4% (about 0.33%) on your balance each month. After the first month, you have $10,033.33. In the second month, the bank calculates 0.33% on $10,033.33, not just the original $10,000. Over a year, this compounds to roughly $10,408 — more than the simple 4% of $10,000 would give you.

The more frequently interest compounds, the more you earn. An account that compounds daily earns slightly more than one that compounds monthly, which earns more than one that compounds quarterly. Most savings accounts compound daily, which is why you should check whether your account does.

The longer your money stays in the account, the more compounding works in your favor. A $10,000 deposit at 4% compounded monthly grows to about $10,408 in one year, $10,833 in two years, and $11,274 in three years. This is why moving money to a higher-rate account early makes a real difference over time.

Taxes on interest income and what you need to report

Interest you earn on a savings account is taxable income. The bank will send you a Form 1099-INT at the end of the year showing how much interest you earned. You must report this amount on your federal tax return, even if the amount is small.

The tax you owe depends on your overall income and tax bracket. If you earned $100 in interest and you are in the 22% tax bracket, you would owe roughly $22 in federal income tax on that interest (though state taxes may apply as well). Some states do not tax interest income, while others do.

If you earned less than $10 in interest during the year, the bank may not send you a Form 1099-INT, but you still must report the interest on your tax return. Keep your own records of interest earned if the amount is small.

What to do if your bank lowers its interest rate

Banks can lower interest rates at any time without notice, and they often do when the Federal Reserve cuts its benchmark rate. If your bank drops its rate significantly, you have two options: stay with your current bank or move your money to a bank offering a better rate.

Check your bank's rate against competitors every few months, especially after the Fed announces a rate change. If you find a better rate elsewhere, transferring takes only a few days and costs nothing. There is no penalty for moving your savings to another bank.

Some banks offer rate guarantees for a limited time — for example, "4.50% APY for the first three months" — but these are promotional rates that drop after the period ends. Read the fine print before opening an account to understand when the rate changes.

Frequently Asked Questions

Do I have to keep a minimum balance to earn interest?

Most savings accounts have no minimum balance requirement to earn interest, but some require $500, $1,000, or more. Check your bank's account terms before opening. If you fall below the minimum, the bank may stop paying interest or charge a monthly fee. Online banks typically have no minimum balance requirements.

Can I move my money to a different bank without losing interest I already earned?

Yes. Interest you have already received stays in your account and is yours to keep. You will not owe any penalty or fee for transferring to another bank. The only tax consequence is that you must report the interest as income when you file your tax return.

What is APY and how is it different from the interest rate?

APY stands for Annual Percentage Yield. It shows what you would earn in one year if you left your money untouched and interest compounded. The interest rate is the percentage the bank uses to calculate each payment. APY accounts for compounding, so it is always equal to or higher than the stated rate. Always compare APY when shopping for accounts.

Will I lose interest if I withdraw money from my savings account?

No. You can withdraw money from a savings account at any time without losing the interest you have already earned. The bank will not charge you a penalty for withdrawals. However, some banks limit how many withdrawals you can make per month before charging a fee, so check your account terms.

How often should I check my bank's interest rate?

Check every three to six months, especially after the Federal Reserve announces a rate change. Banks often adjust their rates within weeks of a Fed decision. If your bank's rate drops significantly below what competitors offer, moving your money to a higher-rate account can add hundreds of dollars to your balance over a year.