Interest is money the bank pays you for letting them use your deposit
When you put money in a savings account, the bank lends that money to other customers through mortgages, car loans, and business lines of credit. In exchange for the use of your money, the bank pays you interest—a percentage of your balance, calculated and added to your account on a schedule the bank sets. The rate varies by bank, by account type, and by how much money you have on deposit. You earn nothing if your account pays 0% interest, and you earn more if the rate is higher.
The bank publishes its interest rate in the account disclosure documents you receive when you open the account, and you can see the current rate on the bank's website or by calling. The rate can change at any time—banks lower rates when the Federal Reserve cuts rates, and raise them when the Fed raises rates. You do not have to do anything to earn the interest; it accumulates automatically as long as your money stays in the account.
Key Takeaways
- Interest is calculated as a percentage of your account balance and paid on a schedule set by your bank—usually monthly or daily.
- The interest rate your bank offers depends on the type of account, the current Federal Reserve rate, and how competitive that bank wants to be.
- High-yield savings accounts typically pay 4% to 5% annual interest, while traditional savings accounts often pay less than 1%.
- Interest is taxable income, and your bank will send you a 1099-INT form at the end of the year if you earned $10 or more.
- Moving money in and out of your account does not affect how interest is calculated, but some banks charge fees that reduce your earnings.
How the interest rate is set and why it changes
Banks set their savings rates based on what the Federal Reserve does with its benchmark interest rate. When the Fed raises its rate, banks have more incentive to offer higher savings rates to attract deposits. When the Fed cuts its rate, banks lower their savings rates because they can afford to pay less. The Fed's rate changes roughly every six weeks during meetings, though it can stay the same for months or years.
Beyond the Fed's influence, each bank decides its own rate based on how much money it needs to attract and how much competition it faces. A bank with plenty of deposits might offer a low rate. A newer online bank trying to grow fast might offer a much higher rate to pull customers away from traditional banks. This is why the same type of account can pay 0.01% at one bank and 4.5% at another.
Your rate is locked in when you open the account, but the bank can change it at any time with notice. Most banks notify you by email or mail before the change takes effect. You are not locked into a rate for a year or any set period—you can move your money to a different bank if a competitor offers better terms.
The difference between APY and interest rate
Banks advertise their savings rates using APY, which stands for Annual Percentage Yield. APY is the total amount you will earn in one year if you leave your money untouched, including the effect of compounding—the process of earning interest on your interest.
Here is how compounding works: if your account pays 4% APY and you have $1,000, the bank calculates interest on $1,000 and adds it to your account. The next time interest is calculated, it calculates on the new, larger balance—which now includes the interest you just earned. Over a year, this compounds and produces slightly more money than 4% of $1,000 would suggest.
The frequency of compounding matters. Some banks compound interest daily, some monthly, some quarterly. Daily compounding produces more money than monthly compounding at the same APY, because you earn interest on your interest more often. Most high-yield savings accounts compound daily, which is why they are worth comparing even when the advertised rates look similar.
How often interest is paid and when you see it in your account
Banks calculate and deposit interest on different schedules. Some banks pay interest monthly—on the first day of each month, or on the same date you opened the account. Others pay daily, meaning interest accrues every single day but is deposited into your account monthly or quarterly. A few banks pay quarterly or annually, though this is less common for savings accounts.
You can see how often your bank pays interest in your account disclosure or by logging into your online banking portal. The disclosure will say something like "interest is compounded daily and paid monthly" or "interest is compounded and paid quarterly." If you do not see this information, call the bank's customer service line and ask for the interest payment schedule.
The amount you earn each month or quarter depends on your average balance during that period. If you have $10,000 in the account for the entire month, you earn interest on $10,000. If you withdraw $5,000 halfway through the month, the bank calculates interest on an average of $10,000 and $5,000 for that period. Some banks use the lowest balance during the period instead of the average, which means withdrawals can reduce your earnings more sharply.
Why high-yield savings accounts earn more than traditional accounts
A high-yield savings account is straightforward a savings account at a bank that chooses to pay a higher interest rate. There is no special requirement to open one—you deposit money the same way you would at any other bank. The difference is the rate: high-yield accounts typically pay 4% to 5% APY, while traditional savings accounts at large national banks often pay 0.01% to 0.5%.
Online banks and credit unions tend to offer higher rates because they have lower overhead costs than brick-and-mortar banks. They do not pay for physical branches, so they can pass savings to customers through higher interest rates. Some traditional banks also offer high-yield savings accounts to compete with online banks, though the rates are usually lower than what pure online banks offer.
The trade-off is convenience. An online bank might not have a branch you can walk into, and transfers between accounts can take one to three business days instead of being when ready. For most people saving money rather than spending it frequently, this trade-off is worth it—earning 4.5% instead of 0.5% on $10,000 means $400 more per year.
Interest earned is taxable income you must report
The interest your bank pays you is taxable income. You must report it on your federal tax return, and depending on your state, you may owe state income tax on it as well. If you earned $10 or more in interest during the year, your bank will send you a 1099-INT form by January 31 of the following year. You use this form to report the interest on your tax return.
If you earned less than $10, the bank does not send a 1099-INT, but you still owe tax on the interest if your total income requires you to file a return. Keep your own records of interest earned if the amount is small.
The tax you owe depends on your tax bracket. If you are in the 22% federal tax bracket and earn $500 in interest, you owe roughly $110 in federal tax on that interest (plus any state tax). This is why the interest rate matters more than it might seem—a higher rate means more money in your pocket after taxes.
Fees that reduce or eliminate your interest earnings
Some savings accounts charge monthly maintenance fees, overdraft fees, or fees for falling below a minimum balance. These fees are subtracted from your account balance and directly reduce the interest you earn. A $10 monthly maintenance fee on a $1,000 balance earning 4% APY means you lose $120 per year in fees—more than the $40 you would earn in interest.
Before opening a savings account, check the fee schedule in the disclosure document. Look for monthly maintenance fees, minimum balance requirements, and what happens if you fall below the minimum. Most high-yield savings accounts and online banks charge no monthly fees, which is one reason they are competitive even when rates are similar to traditional banks.
If your current account charges fees that eat into your interest, moving to a no-fee account at a different bank can increase your net earnings significantly. The interest you earn minus the fees you pay is what actually matters to your savings growth.
Frequently Asked Questions
Can I lose money if the interest rate goes down?
No. Your account balance stays the same when rates change. You straightforward earn less interest going forward. If you have $5,000 and the rate drops from 4% to 2%, you still have $5,000—you just earn less money on top of it each month.
What happens to my interest if I withdraw money mid-month?
Most banks calculate interest on your average balance during the month, so withdrawals reduce the interest you earn that period. Some banks use the lowest balance instead, which penalizes withdrawals more heavily. Check your account disclosure to see which method your bank uses.
Do I have to do anything to earn interest, or does it happen automatically?
It happens automatically. As long as your money is in the account, the bank calculates and deposits interest on its schedule. You do not have to take any action or meet any conditions beyond keeping the account open.
Is the interest rate may provide to stay the same?
No. Banks can change rates at any time with notice, usually by email or mail. Your rate is not locked in for any set period. If a competitor offers a better rate, you can move your money to that bank.
How much interest will I earn on my specific balance?
Multiply your balance by the APY and divide by 12 for a rough monthly estimate. A $10,000 balance at 4% APY earns roughly $33 per month. Use your bank's interest calculator on its website for a more precise number based on your exact balance and compounding schedule.