Banks pay interest by calculating a percentage of your balance and adding that amount to your account on a set schedule
Interest is money the bank pays you for letting them hold your money. The bank takes deposits from customers like you, lends that money out to other customers at a higher rate, and shares a portion of what they earn with you. 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—meaning how often it calculates and adds the interest to your balance.
Most savings accounts compound interest daily, weekly, or monthly. Daily compounding is the most common and works in your favor because interest gets calculated on your growing balance, not just your original deposit. If your account compounds monthly, the bank waits until the end of the month to calculate and deposit the interest. If it compounds daily, you earn a tiny bit of interest each day, and that interest itself starts earning interest the next day.
Key Takeaways
- Interest rates on savings accounts vary by bank and change based on what the Federal Reserve does with its benchmark rate, so shopping around matters.
- Daily compounding means you earn interest on your interest, which adds up faster than monthly or weekly compounding.
- The Annual Percentage Yield (APY) is the real number to compare between banks because it shows what you'll actually earn in a year, including compounding.
- High-yield savings accounts at online banks typically pay three to five times more interest than traditional brick-and-mortar banks.
- You can see your interest earnings on your monthly statement, and the bank reports annual interest to the IRS on a 1099-INT form if you earn $10 or more.
The difference between interest rate and APY
Banks advertise two numbers: the interest rate (also called the annual percentage rate or APR) and the Annual Percentage Yield (APY). The interest rate is the percentage the bank pays on your balance. The APY is what you actually earn when compounding is included. If a bank offers 4.5% APR with daily compounding, your real earnings will be slightly higher than 4.5% because of that compounding effect.
Always compare banks using APY, not the interest rate. A bank advertising 4.5% APR with monthly compounding will pay you less than a bank offering 4.4% APY with daily compounding. The APY number already accounts for how often interest compounds, so it's the honest comparison. You'll find both numbers on the bank's website, usually near the savings account description or in the account details section.
How interest rates change and why they're different at each bank
Interest rates on savings accounts move up and down based on decisions made by the Federal Reserve, the central bank of the United States. When the Fed raises its benchmark rate, banks typically raise the interest they pay on savings accounts. When the Fed lowers rates, banks lower what they pay you. This happens because banks' own costs change, and they adjust what they offer customers to stay competitive.
Different banks pay different rates even when the Fed's benchmark is the same. Online banks—which have lower overhead costs than physical branches—usually pay higher rates than traditional banks. A large national bank might pay 0.01% APY on a basic savings account, while an online bank pays 4.5% APY on the same type of account. The difference is real money. On a $10,000 balance, 0.01% earns you $1 per year, while 4.5% earns you $450 per year.
When and how often interest gets added to your account
The bank deposits interest into your account on a schedule set by the bank. Most banks add interest monthly, meaning on the same day each month (often the last day) the bank calculates what you've earned and deposits it. Some banks compound and credit interest daily, weekly, or quarterly. Check your account details or call the bank to find out your account's schedule.
You can see the interest deposited by looking at your monthly statement or logging into your online account. Each deposit will show up as a separate transaction labeled "interest paid" or similar. If you earn $10 or more in interest during a calendar year, the bank sends you and the IRS a 1099-INT form by January 31 of the following year. You'll report this interest as income on your tax return.
How to find accounts with higher interest rates
Start by checking what your current bank pays. Log in to your account online or call customer service and ask for the APY on your savings account. Write it down. Then visit the websites of online banks like Marcus, Ally, Capital One 360, or Discover. These banks publish their current APY rates on their homepage or savings account page—no login required to see the rate.
Compare the APY numbers side by side. If an online bank's rate is significantly higher, open an account there and transfer your money. The process takes a few days. You can keep your old account open or close it; there's no penalty for moving your money to a bank that pays more. Rates change frequently, so check back every few months to see if a different bank has become more competitive.
What happens to your interest if you withdraw money
Interest is calculated on your average daily balance or your ending balance, depending on the bank's method. If you withdraw money partway through the month, the interest you earn that month will be lower because your balance was lower for part of the period. The bank doesn't penalize you for withdrawals—you simply earn less interest on the days when your balance was smaller.
Some savings accounts have withdrawal limits or require you to maintain a minimum balance to earn the advertised rate. Read the account terms before opening. Most online savings accounts have no withdrawal limits and no minimum balance requirements, so you can take money out whenever you need it without losing the interest rate.
Why some accounts pay almost no interest
Traditional savings accounts at brick-and-mortar banks often pay 0.01% to 0.05% APY. Money market accounts at the same banks might pay slightly more. These low rates exist because the bank doesn't need to compete aggressively for deposits—customers choose them for convenience (physical branches, ATM networks) rather than for interest earnings. The bank keeps most of the profit from lending out your money.
Checking accounts almost never pay interest, or pay such a small amount it rounds to zero. If you see a checking account advertising interest, read the fine print—it usually requires a very high minimum balance or direct deposit of a certain amount, and the rate is still minimal. For earning interest on money you're not spending immediately, a dedicated savings account is the right tool.
Frequently Asked Questions
Do I have to pay taxes on the interest I earn?
Yes. Interest income is taxable. If you earn $10 or more in a calendar year, the bank sends you a 1099-INT form and reports it to the IRS. You report this amount on your tax return as income. The amount you owe in taxes depends on your overall income and tax bracket.
Can I lose money if interest rates drop?
No. The interest rate on your savings account can only go down or stay the same—it cannot go negative. If rates drop, you'll earn less interest going forward, but the money you already have in the account stays there. You won't lose principal.
What's the difference between a savings account and a money market account?
Money market accounts often pay slightly higher interest than savings accounts, but they may require a higher minimum balance and limit how many withdrawals you can make per month. Savings accounts are more flexible. Both are FDIC-insured up to $250,000, so your money is protected either way.
Should I move my money to a high-yield account if rates are about to drop?
If a bank is currently offering a high rate, that rate is locked in for your account. If rates drop later, your rate drops too—the bank can change rates on savings accounts without notice. Move your money to the highest-paying account available now, because you'll earn more interest while rates are high, and you can move it again if a better option appears later.
How much interest will I actually earn on my savings?
Use this formula: (Your balance × APY) ÷ 12 = monthly interest. For example, $10,000 at 4.5% APY earns about $37.50 per month. Online calculators on bank websites can do this math for you—search "savings interest calculator" and enter your balance and the APY to see what you'd earn.