How banks pay you interest on savings

Banks pay you interest as a percentage of the money you keep in your savings account. The bank uses your deposits to make loans and investments, and they share a portion of what they earn by paying you interest on your balance. The amount you earn depends on three things: how much money sits in the account, the interest rate the bank offers, and how often the bank compounds the interest (adds earned interest back into your account so you earn interest on that too).

Interest rates vary widely between banks and account types. A traditional savings account at a large national bank might pay 0.01% annually, while an online bank's high-yield savings account might pay 4.5% or higher. The difference between these rates is real money—on a $10,000 balance, 0.01% earns $1 per year, while 4.5% earns $450 per year. Banks set their rates based on what the Federal Reserve does with interest rates, so rates change over time and differ from bank to bank.

Key Takeaways

  • Interest rates on savings accounts range from under 0.01% at large national banks to 4.5% or higher at online banks, and the difference adds up quickly on larger balances.
  • Compounding means the bank adds your earned interest back into your account, so you earn interest on that interest—daily compounding earns more than monthly or annual compounding.
  • Your interest rate can change at any time because banks adjust rates based on Federal Reserve decisions, so a rate that is high today may drop in six months.
  • Money market accounts and certificates of deposit (CDs) often pay higher rates than regular savings accounts, but money market accounts may limit withdrawals and CDs lock your money away for a set time.

How compounding frequency affects what you earn

Compounding is how often the bank calculates interest and adds it back to your account. If a bank compounds daily, it calculates one day's worth of interest and adds it to your balance every single day. If it compounds monthly, it does this calculation once a month. The more often compounding happens, the more interest you earn, because you are earning interest on the interest that was already added.

The difference is small on low balances but grows with larger amounts and higher rates. On $50,000 at 4.5% annual interest, daily compounding earns about $2,296 per year, while annual compounding (interest calculated and added once per year) earns $2,250. That $46 difference happens because with daily compounding, you earn interest on the interest that accumulated the day before. Most online banks compound daily, while some traditional banks compound monthly or quarterly.

Where to find the interest rate and terms

Your bank publishes the current interest rate and compounding frequency in the account disclosure document, usually called a Truth in Savings disclosure or account agreement. You can find this on the bank's website, often in a section labeled "Disclosures" or "Account Terms." The disclosure also states whether the rate is fixed (stays the same) or variable (can change), and when the bank can change it.

Before opening an account, compare the annual percentage yield (APY) across banks, not just the interest rate. APY includes the effect of compounding, so it shows you the real amount you will earn in a year. A bank advertising "4.5% interest" and another advertising "4.5% APY" are not the same thing—the APY number is what matters. You can compare rates across banks on financial websites, but always verify the current rate on the bank's own website before opening an account, because rates change frequently.

Why rates change and how to monitor yours

Banks change savings account rates based on what the Federal Reserve does with its benchmark interest rate. When the Fed raises rates, banks typically raise savings rates within days or weeks. When the Fed cuts rates, banks often cut savings rates just as quickly. This means a rate that is competitive today may not be in three months. Your bank is not required to notify you before lowering your rate on an existing account, though many do send an email or letter.

Check your account's current rate every few months by logging into your bank's website or calling customer service. If your rate has dropped significantly and other banks are offering much higher rates, moving your money to a different bank is straightforward—you open a new account at the higher-rate bank and transfer your balance. There is no penalty for switching banks, and you do not lose any interest you have already earned. Some people keep savings at multiple banks to take advantage of different rates for different purposes.

High-yield savings accounts versus regular savings accounts

A high-yield savings account is simply a savings account at a bank that pays a higher interest rate than traditional banks. Most high-yield accounts are offered by online banks that have lower overhead costs than brick-and-mortar banks, so they can pass higher rates to customers. High-yield accounts are FDIC insured the same way regular savings accounts are, meaning your money is protected up to $250,000 if the bank fails.

The trade-off is usually convenience. Online banks have no physical branches, so you cannot walk in to deposit cash or speak to someone in person. Most online banks let you deposit checks by phone camera or transfer money from another bank account, but cash deposits require mailing a check or using an ATM network (which may charge fees). If you need to deposit cash regularly, a high-yield account at a bank with branches or ATMs may be worth a slightly lower rate.

Money market accounts and CDs as alternatives

A money market account is a hybrid between a checking account and a savings account. It typically pays a higher interest rate than a regular savings account but lower than a high-yield savings account. In exchange, it usually comes with a debit card and check-writing privileges, though banks often limit how many withdrawals you can make per month (usually six). Money market accounts are FDIC insured and work well if you want some of the benefits of checking while earning interest.

A certificate of deposit (CD) locks your money away for a set time—typically three months to five years—in exchange for a higher interest rate. If you withdraw the money before the CD matures, you pay an early withdrawal penalty, usually equal to a few months of interest. CDs make sense if you know you will not need the money for a specific period and want to lock in a higher rate. A CD ladder—opening multiple CDs that mature at different times—lets you access some of your money regularly while keeping rates higher than a savings account.

What happens to interest if you withdraw money

Interest accrues (builds up) daily but is usually credited to your account monthly. If you withdraw money before the interest is credited, you lose the interest that has accrued since the last credit date. For example, if your bank credits interest on the first of each month and you withdraw money on the 15th, you lose the interest that built up from the 1st to the 15th. This is why keeping money in the account for full months maximizes what you earn.

Some banks calculate interest on the lowest balance during the month, meaning if you had $10,000 for 29 days and $5,000 for one day, they calculate interest on $5,000 for the whole month. Others use the average daily balance method, which is fairer—they average your balance across all days in the month. Check your account agreement to see which method your bank uses, because it affects how much you earn if your balance fluctuates.

Frequently Asked Questions

Can I lose money in a savings account?

No, you cannot lose the principal (the money you deposited) in an FDIC-insured savings account. The bank guarantees your balance up to $250,000. Interest rates can go down, so you might earn less than you expected, but your original deposit is safe. If the bank fails, the FDIC pays you back.

Is the interest rate I see online may provide?

No. Banks can change rates at any time, and the rate you see advertised may be different by the time you open an account. Rates change daily based on market conditions. Always check the rate on the bank's website immediately before opening an account, and confirm the rate in writing when you complete the application.

Do I have to pay taxes on savings account interest?

Yes. Interest earned on a savings account is taxable income. Your bank sends you a 1099-INT form each January if you earned $10 or more in interest during the year. You report this on your tax return. The interest is taxed at your regular income tax rate, not as capital gains.

What is the difference between APR and APY?

APR (annual percentage rate) is the interest rate without compounding. APY (annual percentage yield) includes the effect of compounding. For savings accounts, always compare APY, because it shows the real amount you will earn. A bank might advertise 4.5% APR, but if it compounds daily, the APY could be 4.6% or higher.

Can I move my savings to a different bank without losing interest?

Yes. You keep all interest you have already earned. When you transfer money to a new bank, you do not lose any of the interest that was credited to your account. You only lose future interest if you close the account before the next interest credit date, which is usually the first of the month.