Yes, money increases in a savings account through interest
Your savings account balance grows when the bank pays you interest — a percentage of the money you keep deposited. The bank uses your money to lend to other customers and invests it; in return, they share a portion of what they earn with you. The amount you earn depends on the interest rate the bank offers, how much you have saved, and how long the money sits in the account.
The rate varies widely. Some savings accounts pay 4% to 5% annually right now, while others pay less than 0.01%. The difference between a high-rate account and a low-rate one can mean hundreds of dollars per year on the same balance. Banks change their rates frequently, especially when the Federal Reserve adjusts its benchmark rate, so the rate you see today may not be the rate you earn next month.
Interest compounds, meaning you earn money on the interest you already earned. If your account compounds daily, you gain interest on your balance every single day, and that interest gets added to your balance so the next day's interest is calculated on a slightly larger amount. Over months and years, compounding makes a real difference in how much your money grows.
Key Takeaways
- Banks pay interest on savings account balances, and the rate varies from under 0.01% to 5% or higher depending on the bank and current market conditions.
- Interest compounds, usually daily, so you earn money on your interest as well as your original deposit.
- A high-yield savings account typically pays 4% to 5% annually, while traditional bank savings accounts often pay under 0.5%.
- Your total earnings depend on three things: the interest rate, your account balance, and how long the money stays in the account.
- Banks lower rates when the Federal Reserve cuts rates and raise them when the Fed raises rates, so your earnings can change several times per year.
How interest rates are set and why they change
Banks set their own savings rates based on what the Federal Reserve does and what competitors are offering. When the Federal Reserve raises its benchmark rate, banks have more room to pay higher interest on deposits because they can charge more when they lend money out. When the Fed lowers rates, banks typically lower what they pay you.
Competition also drives rates. When many banks offer high rates, other banks have to match them or lose customers. During periods when rates are low across the industry, even the best savings accounts may pay less than 1%. During periods when rates are high, you can find accounts paying 4% or 5% or more.
The rate you lock in is not permanent. Banks can change the rate on your savings account at any time, usually with a few days' notice. Some accounts have promotional rates that are high for a limited time, then drop to a lower standard rate. Read the fine print when you open an account so you know whether the rate is may provide or promotional.
The difference between simple and compound interest
Simple interest means the bank pays you a percentage of your original deposit once per year, and that payment does not earn interest itself. If you deposit $10,000 at 5% simple interest, you earn $500 per year, every year, regardless of how much interest has accumulated.
Compound interest means interest gets added to your balance, and then the next interest payment is calculated on the new, larger balance. Most savings accounts compound daily, which means the bank calculates and adds interest to your account every day. Daily compounding is better for you because you earn interest on your interest more frequently.
The difference grows over time. On a $10,000 deposit at 5% annual interest, simple interest earns you $500 per year. Compound interest (compounded daily) earns you about $512 per year because you are earning interest on the interest that was added earlier in the year. Over five years, compound interest puts several hundred dollars more in your account than simple interest would.
How to calculate what you will earn
Banks use a formula called APY, or Annual Percentage Yield, to show you what you will earn in one year including the effect of compounding. The APY is the number you should compare when choosing between accounts — it is more accurate than the interest rate alone because it accounts for how often interest compounds.
If a bank advertises 5% APY on a savings account, that means if you deposit $1,000 and leave it untouched for one year, you will have about $1,050 at the end of the year. If you deposit $10,000, you will have about $10,500. The math works the same way for any amount.
For longer periods, the growth accelerates. A $10,000 deposit at 5% APY grows to about $12,763 after five years, and about $16,289 after ten years, assuming the rate stays the same and you do not add or withdraw money. Most banks have a calculator on their website where you can enter your deposit amount, the APY, and the time period to see what you will earn.
Why some accounts earn more than others
High-yield savings accounts pay significantly more than traditional savings accounts at the same bank. A traditional savings account at a major bank might pay 0.01% to 0.5% APY, while a high-yield account at the same bank or an online bank might pay 4% to 5% APY. The difference is real money: on a $10,000 balance, you earn $1 to $50 per year in a traditional account, or $400 to $500 per year in a high-yield account.
Online banks and credit unions often pay higher rates than large brick-and-mortar banks because they have lower overhead costs and compete aggressively for deposits. Money market accounts sometimes pay slightly more than savings accounts, though they may require a higher minimum balance or limit how many withdrawals you can make per month.
Certificates of Deposit (CDs) typically pay more than savings accounts, but you have to lock your money away for a set period — usually three months to five years. If you withdraw before the term ends, you pay a penalty. The longer the term, the higher the rate usually is.
What happens to your interest if you withdraw money
Interest accrues daily, but you only receive it if the money stays in the account. If you deposit $10,000 on January 1 and withdraw $5,000 on January 15, you earn interest only on the $10,000 for the first 14 days and on the $5,000 for the rest of the month. The interest is calculated based on your daily balance.
Some accounts charge a penalty if you make too many withdrawals in a month, though federal rules changed in 2020 and most banks no longer enforce withdrawal limits on savings accounts. Check your account terms to see whether there are any restrictions.
If you need the money soon, a savings account is still the right place for it because you earn interest while you wait and can access the money quickly. The interest you earn is a bonus, not the main reason to keep money in savings.
How interest is taxed
Interest you earn on a savings account is taxable income. The bank will send you a 1099-INT form at the end of the year if you earned $10 or more in interest, and you have to report that income on your tax return. The amount you owe in taxes depends on your tax bracket — if you are in the 22% bracket, you owe about 22% of the interest you earned in federal taxes.
This means the real return on your savings is less than the APY. If you earn $500 in interest and owe $110 in taxes, your actual gain is $390. High-yield savings accounts still come out ahead because even after taxes, 4% or 5% interest is much better than the 0.01% you might earn elsewhere.
Some people use tax-advantaged accounts like IRAs or 529 plans to save money and earn interest without paying taxes on the interest each year, though these accounts have rules about when you can withdraw the money. A regular savings account has no withdrawal restrictions, so it is better for money you might need soon.
Frequently Asked Questions
Does money in a savings account grow automatically?
Yes. Interest is calculated and added to your account automatically, usually daily. You do not have to do anything — just keep the money in the account and it will grow. The growth is small each day but adds up over weeks and months.
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. APY is always equal to or higher than APR. When comparing savings accounts, use APY because it shows what you will actually earn.
Can I lose money in a savings account?
No. Your balance will never go down because of the account itself. Interest only adds to your balance. You can only lose money if you withdraw it or if the bank fails, though deposits up to $250,000 are protected by FDIC insurance at most banks.
How often does interest get added to my account?
Interest is calculated daily at most banks, but it is usually deposited into your account monthly. Some banks deposit it quarterly or annually. Check your account statement or the bank's website to see how often interest is credited to your account.
Will my interest rate stay the same forever?
No. Banks can change the rate on your savings account at any time, usually with a few days' notice. Rates tend to go up when the Federal Reserve raises rates and down when the Fed lowers rates. Check your bank's website or statements to see if your rate has changed.