Your interest depends on the bank's rate and how much money you have in the account

The amount of interest you earn from a savings account is determined by two things: the annual percentage yield (APY) the bank offers and your account balance. A bank paying 4.5% APY on $10,000 will pay you roughly $450 per year in interest. The same bank paying 0.01% APY on that same $10,000 will pay you about $1 per year. The difference between these two scenarios is real money in your pocket—or money left on the table.

Interest compounds, meaning you earn interest on the interest you've already earned. Most savings accounts compound daily or monthly, so your balance grows slightly faster than a straightforward calculation would suggest. However, the compounding effect is small unless you're leaving money untouched for years.

Banks set their own rates based on what the Federal Reserve does with its benchmark rate. When the Fed raises rates, banks typically raise savings rates within weeks or months. When the Fed cuts rates, banks cut savings rates faster than they raise them. This means the rate you see today may not be the rate you see in six months.

Key Takeaways

  • Your interest earnings equal your account balance multiplied by the APY, divided by 12 for a monthly estimate or by 365 for a daily estimate.
  • High-yield savings accounts at online banks currently pay between 4% and 5.3% APY, while traditional brick-and-mortar banks often pay 0.01% to 0.05%.
  • Interest compounds daily or monthly depending on the bank, so you earn small amounts of interest on your interest.
  • Banks change their rates without notice, so the APY you see when you open an account may drop within months if the Federal Reserve cuts rates.

How to calculate what you'll earn

The formula is straightforward: multiply your balance by the APY, then divide by the number of times interest compounds per year. If your bank compounds daily (which most do), divide by 365. If it compounds monthly, divide by 12.

Example: You have $5,000 in an account earning 4.5% APY, compounded daily. Multiply $5,000 by 0.045 to get $225 per year. Divide $225 by 365 to get $0.62 per day in interest. Your bank adds that amount to your account each day, so after 30 days you've earned roughly $18.60.

This calculation assumes your balance stays the same. If you deposit more money, you'll earn interest on the new balance going forward. If you withdraw money, your interest earnings drop when ready.

Why rates vary so much between banks

Online banks pay higher rates than traditional banks because they have lower overhead costs—no physical branches, fewer employees, cheaper buildings. They pass those savings to customers in the form of higher APY. A bank like Ally or Marcus can afford to pay 4.5% APY because they don't maintain a network of branches. A regional bank with 200 locations cannot offer the same rate and stay profitable.

Some banks also use savings rates as a marketing tool to attract new customers. They'll offer a promotional rate for the first few months, then drop it to a lower standard rate. Always read the fine print to see whether the rate you're seeing is temporary.

Banks also set rates based on how much money they need to borrow from customers. During periods when banks have plenty of deposits, they lower rates because they don't need to attract more money. During tight periods, they raise rates to compete for deposits.

What happens when the Federal Reserve changes rates

The Federal Reserve sets a target range for the federal funds rate, which is the rate banks charge each other for overnight loans. This rate influences—but does not directly control—the rates banks offer to customers. When the Fed raises its rate, banks typically raise savings rates within two to four weeks. When the Fed cuts rates, banks cut savings rates much faster, sometimes within days.

This asymmetry means you benefit quickly when rates rise but lose ground quickly when rates fall. If you're shopping for a savings account, check whether the bank has a history of raising rates when the Fed raises rates. Some banks are faster to move than others.

The Fed's rate decisions happen roughly every six weeks. You can find the current target range on the Federal Reserve's website, which also publishes a calendar of upcoming meetings.

The difference between APY and APR

APY (annual percentage yield) includes the effect of compounding. APR (annual percentage rate) does not. For savings accounts, always look at the APY, because that's what you'll actually earn. APR is used for loans and credit cards, not for savings.

If a bank advertises an APY of 4.5%, that 4.5% already accounts for daily or monthly compounding. You don't need to do any additional math. The APY is the real number.

How to find the highest rate for your situation

High-yield savings accounts at online banks currently pay between 4.0% and 5.3% APY, depending on the bank and the current rate environment. Traditional banks and credit unions typically pay between 0.01% and 0.5% APY. The difference between a high-yield account and a traditional account on a $10,000 balance is roughly $400 to $500 per year.

Some banks offer tiered rates, meaning you earn a higher APY on larger balances. For example, a bank might pay 4.0% on balances up to $25,000 and 4.5% on balances above that. Read the rate sheet carefully to understand how much you'll earn at your specific balance.

Money market accounts sometimes pay slightly higher rates than savings accounts at the same bank, but they usually require a higher minimum balance and limit how many withdrawals you can make per month. Compare the rate, the minimum balance requirement, and the withdrawal limits before choosing.

What reduces your interest earnings

Monthly maintenance fees eat directly into your interest. If you earn $5 per month in interest but pay a $10 monthly fee, you're losing money. Most online banks charge no monthly fee, but some traditional banks do. Always ask whether there's a monthly maintenance fee before opening an account.

Minimum balance requirements can also cost you. Some banks require you to maintain a certain balance to earn the advertised rate. If you fall below that balance, your rate drops to a much lower tier. Read the account agreement to see what balance you need to maintain.

Withdrawal limits don't directly reduce interest, but they can prevent you from moving money to a higher-paying account. Some savings accounts limit you to six withdrawals per month. If you need more flexibility, look for an account with no withdrawal limits or choose a money market account instead.

Frequently Asked Questions

Do I pay taxes on savings account interest?

Yes. Interest income is taxable as ordinary income. Your bank will send you a 1099-INT form at the end of the year if you earned $10 or more in interest. You report this on your tax return. The higher your APY and balance, the more you'll owe in taxes on the interest.

Can a bank lower my rate without telling me?

Yes. Banks can change savings rates at any time without notice. They're required to notify you of changes, but the notification can come via email or a notice in your online account—not a phone call or letter. Check your account statements and emails regularly to catch rate changes.

What's the difference between a savings account and a money market account?

Money market accounts often pay slightly higher rates but require a larger minimum balance and limit your withdrawals. Savings accounts are more flexible but pay lower rates. If you need to access your money frequently, a savings account is usually the better choice.

Is my interest safe if the bank fails?

Yes. The FDIC insures deposits up to $250,000 per depositor per bank. Your interest earnings are covered by this insurance. If a bank fails, you'll receive your balance plus all earned interest up to the $250,000 limit.

Should I move my money to a higher-paying bank?

If your current bank pays 0.01% and you have $10,000, moving to a bank paying 4.5% would earn you roughly $450 more per year. The move takes about a week and involves no cost. If the rate difference is significant and you have a substantial balance, the move usually makes financial sense.