Interest is money the bank pays you for letting them use your deposits

When you put money in a savings account, the bank lends most of it out to other customers as mortgages, car loans, and business loans. 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 amount you earn depends on three things: how much money you have in the account, what interest rate the bank offers, and how long your money sits there. A higher balance, a higher rate, and a longer time period all mean more interest in your pocket.

You do not have to do anything to earn it. Once your money is in an account that pays interest, the bank calculates what you owe and deposits it automatically. The interest becomes part of your balance, and if you leave it there, you earn interest on the interest too—a process called compounding.

Key Takeaways

  • Interest rates vary by bank and by account type, so comparing rates before you open an account can mean hundreds of dollars in difference over a year.
  • Online banks typically pay higher rates than brick-and-mortar banks because they have lower overhead costs.
  • Money market accounts and certificates of deposit (CDs) usually pay more interest than regular savings accounts, but with tradeoffs in how quickly you can access your money.
  • The frequency of compounding—daily, monthly, or yearly—affects how much total interest you earn, especially on larger balances.
  • Interest rates change over time, so a rate that is high today may be lower in six months.

Where to find accounts that pay interest

Not all bank accounts pay interest. Checking accounts typically pay little to nothing. Savings accounts are the basic choice and are offered by every bank. They let you withdraw money whenever you want, but the interest rate is usually modest—often less than 1 percent per year, though this varies by bank and by the current economic environment.

Online banks (banks with no physical branches) almost always pay higher rates than traditional banks. Because they do not maintain buildings and staff, they pass the savings to customers. An online savings account might pay 4 or 5 percent annually, while a brick-and-mortar bank pays 0.5 percent for the same type of account. The tradeoff is that you manage everything by computer or phone—there is no teller to talk to in person.

Money market accounts are a hybrid. They work like savings accounts but usually pay higher interest. Some let you write checks or use a debit card, though there are limits on how many times per month you can withdraw. The catch is that money market accounts often require a larger opening balance—sometimes $2,500 or more.

Certificates of deposit (CDs) pay the highest interest rates, but with a condition: you agree to leave your money untouched for a set period, usually three months to five years. If you withdraw before that time is up, the bank charges a penalty that can wipe out all your interest and some of your principal. CDs make sense if you know you will not need the money for a while.

How interest rates are set and why they change

Banks do not choose their interest rates in a vacuum. The Federal Reserve, the central bank of the United States, sets a target interest rate that influences what banks charge borrowers and what they pay savers. When the Fed raises its rate, banks eventually raise the rates they pay on savings accounts. When the Fed lowers its rate, savings rates fall too.

This means the interest rate you see today may not be the rate you get next month. If rates are rising, it pays to lock in a CD now. If rates are falling, a regular savings account with no time commitment makes more sense because you can move your money if a better rate appears elsewhere.

Competition also matters. If one online bank starts paying 5 percent and others are paying 3 percent, customers move their money. The slower banks then raise their rates to compete. This is why checking rates across banks before you open an account is worth your time—the difference between a 2 percent account and a 4 percent account is real money.

How compounding multiplies your interest

Compounding is the reason interest-bearing accounts are worth using even when rates are low. It means the bank pays interest not just on your original deposit, but on the interest you have already earned.

Here is a concrete example. Suppose you deposit $1,000 in an account paying 4 percent annual interest, compounded daily. After one day, the bank calculates one day's worth of interest (about 11 cents) and adds it to your balance. The next day, it calculates interest on $1,000.11, not just $1,000. Over a year, this daily compounding adds up to more than if the bank calculated interest once at the end of the year.

The more frequently interest compounds, the more you earn. Daily compounding beats monthly compounding, which beats yearly compounding. Most savings accounts compound daily, which is why that detail matters when you are comparing banks.

The difference between APY and interest rate

Banks advertise two numbers: the interest rate and the APY (Annual Percentage Yield). The interest rate is the base percentage. The APY is what you actually earn in a year after compounding is factored in.

If a bank offers 4 percent interest compounded daily, the APY might be 4.08 percent because of compounding. The APY is the number that matters for comparing accounts, because it shows the real return you will get. Always look at the APY, not the interest rate alone.

How often interest is deposited to your account

Banks calculate interest on different schedules. Some compound and deposit interest daily, some monthly, and some quarterly. The frequency does not change the total amount you earn in a year—the APY accounts for that—but it does affect when you see the money in your account.

If interest is deposited monthly, you will see a credit to your account once a month. If it is deposited daily, the balance grows a tiny bit each day, though you may only see the total reflected in your statement once a month. For most people, this does not matter much. What matters is the APY.

Why some accounts pay more than others

A savings account at a large national bank might pay 0.5 percent, while an online bank pays 4.5 percent for the same type of account. The difference is not because one bank is generous and the other is stingy. It is because of how they operate.

Large banks with many branches have high costs: rent, utilities, employee salaries, security. They pass some of those costs to customers by paying lower interest. Online banks have almost no physical overhead, so they can afford to pay more. Credit unions, which are member-owned nonprofits, sometimes pay higher rates than banks because they do not have shareholders demanding profits.

The trade-off is access. An online bank cannot help you in person. A large bank with branches offers convenience but lower rates. The choice depends on whether you value higher interest or in-person service more.

Frequently Asked Questions

Do I have to pay taxes on interest I earn?

Yes. Interest is taxable income. At the end of each year, your bank sends you a Form 1099-INT showing how much interest you earned. You report this on your tax return. The amount is usually small unless you have a large balance or a very high rate, but it still counts as income.

What happens to my interest if I withdraw money before the end of the month?

For regular savings accounts and money market accounts, you still earn interest on the money you had in the account, calculated up to the day you withdrew it. For CDs, withdrawing early triggers a penalty that reduces or eliminates your interest. Always check the CD terms before you open one.

Is my interest safe if the bank fails?

Yes. The FDIC (Federal Deposit Insurance Corporation) insures deposits up to $250,000 per account holder per bank. This means if the bank fails, the government guarantees you get your money back, including any interest earned. Your interest is as safe as your principal.

Can I move my money to a different bank if I find a better interest rate?

Yes, for savings accounts and money market accounts. You can withdraw and move to another bank anytime. For CDs, you can move the money, but you will pay an early withdrawal penalty. It is worth calculating whether the higher rate at the new bank makes up for the penalty before you switch.

Why is the interest rate on my account lower than the rate advertised online?

Banks sometimes advertise a promotional rate that applies only to new accounts or to deposits above a certain amount. Your existing account may be on a different tier. Check your account terms or call the bank to confirm what rate you are actually earning.