Interest is money your bank pays you for keeping money in your account
When you deposit money into a savings account, the bank lends that money to other customers through mortgages, car loans, and credit cards. In return, the bank pays you interest — a percentage of your balance that gets added to your account on a set schedule, usually monthly or daily.
The amount you earn depends on three things: how much money you have in the account, what interest rate the bank offers, and how often the interest compounds (gets calculated and added back in). A bank offering 4.50% annual percentage yield (APY) on $10,000 will pay you roughly $450 per year, though the actual monthly deposits will be smaller and spread throughout the year.
You do not have to do anything to earn interest once your account is open. The bank calculates and deposits it automatically on the schedule they set. You can watch your balance grow in your account statement or online banking portal.
Key Takeaways
- Interest rates vary widely between banks — from under 0.01% at some large national banks to over 5% at online banks and credit unions, so comparing rates before opening an account matters.
- APY (annual percentage yield) is the rate you will actually earn after compounding, while APR (annual percentage rate) is different and not used for savings accounts.
- Interest compounds, meaning you earn interest on your interest, so leaving money untouched for longer increases your total earnings.
- Some accounts require a minimum balance to earn interest, and dropping below it can stop interest payments or trigger fees that erase your earnings.
- High-yield savings accounts at online banks typically pay 4% to 5.35% APY, while traditional brick-and-mortar banks often pay under 0.50% APY.
How banks calculate and pay interest
Banks calculate interest using your daily balance — the amount in your account each day — rather than a single monthly snapshot. They add up all the daily balances for the month, divide by the number of days, and apply the interest rate to that average. The interest is then deposited into your account, usually on the first day of the next month.
Some banks compound interest daily, meaning they calculate it every single day and add it back to your balance immediately. Others compound monthly or quarterly. Daily compounding earns you slightly more because you start earning interest on yesterday's interest right away. The difference is small on small balances but grows as your account gets larger.
You can see the interest posted in your account statement or online banking dashboard. It will appear as a deposit labeled "Interest Paid" or "Interest Earned" on a specific date each month. If you have set up alerts, your bank may notify you when interest is posted.
Why interest rates differ between banks
Online banks typically offer higher rates than traditional banks because they have lower overhead — no physical branches, fewer employees, lower rent. They pass those savings to customers by paying more interest. A bank offering 5.25% APY online might have a branch location offering 0.15% APY for the same type of account.
Credit unions often pay higher rates than national banks because they are member-owned cooperatives rather than profit-driven corporations. They return earnings to members through better rates and lower fees. However, credit unions have membership requirements — you may need to live in a certain area, work for a specific employer, or belong to an organization to join.
Large national banks pay lower rates because they have high operating costs and can attract deposits through brand recognition and convenience rather than competitive rates. They rely on customers who value having a physical branch nearby over earning maximum interest.
Interest rates also move with the Federal Reserve's decisions. When the Fed raises its benchmark rate, banks typically raise savings rates within weeks. When the Fed cuts rates, banks cut savings rates more slowly, so it is worth checking your current rate against what new accounts are earning.
Minimum balances and account requirements
Many savings accounts require you to keep a minimum balance to earn interest. Common minimums are $500, $1,000, or $2,500. If your balance drops below the minimum, the bank stops paying interest until you bring it back up. Some banks also charge a monthly fee if you fall below the minimum, which can wipe out any interest you earned.
Online banks and credit unions often have no minimum balance requirement, which makes them better for people building savings from small amounts. You earn interest on every dollar, no matter how small your account is.
Check your account's terms before opening it. The bank's website or account agreement will state the minimum balance requirement and what happens if you fall below it. If you are unsure, call the bank or visit a branch to ask directly.
High-yield savings accounts versus regular savings accounts
High-yield savings accounts are regular savings accounts that pay significantly higher interest rates — typically 4% to 5.35% APY as of early 2024. They are offered by online banks, some credit unions, and a few traditional banks. The money is still insured by the FDIC (Federal Deposit Insurance Corporation) up to $250,000, just like a regular savings account.
The tradeoff is access. High-yield accounts often limit you to six transfers or withdrawals per month, though this rule is enforced less strictly now than it was in the past. You can still withdraw money whenever you need it — the limit just means frequent withdrawals may trigger a fee or cause the bank to close the account.
A regular savings account at a national bank might pay 0.01% to 0.50% APY. On $10,000, that earns you $1 to $50 per year. The same $10,000 in a high-yield account earning 5% earns you $500 per year — a difference of $450. For larger balances, the gap is even wider.
If you are saving money you will not need for several months or years, a high-yield account makes sense. If you need to access your money frequently or prefer the convenience of a physical branch, a regular account may be worth the lower rate.
Money market accounts and certificates of deposit
Money market accounts are a hybrid between a savings account and a checking account. They typically pay higher interest than regular savings accounts (though usually lower than high-yield savings accounts) and allow you to write checks or use a debit card. They also often require a higher minimum balance — sometimes $2,500 or more.
Certificates of deposit (CDs) are a different product. You agree to leave money in the account for a set period — three months, six months, one year, five years — and in return the bank pays you a higher interest rate. If you withdraw the money before the term ends, you pay a penalty, usually a few months of interest. CDs currently pay 4% to 5.5% APY depending on the term and bank.
CDs make sense if you have money you will not need for a specific amount of time. A one-year CD locks in today's rate for a full year, protecting you if rates drop. Money market accounts make sense if you want higher interest but also need occasional access to your money without penalty.
How to find the best interest rate for your situation
Start by checking what your current bank is paying. Log into your online banking portal or call the customer service number on your debit card. Write down the APY and any minimum balance requirement.
Then compare rates at other banks. Websites like Bankrate, DepositAccounts, and NerdWallet list current rates at hundreds of banks and credit unions, updated daily. You can filter by account type, minimum balance, and whether you want an online or local bank.
If you find a better rate, opening a new account takes 10 to 15 minutes online. You will need your Social Security number, a government ID, and a way to fund the account (a transfer from your current bank or a check deposit). Your money is insured by the FDIC up to $250,000, so moving it to a different bank does not put it at risk.
Do not worry about your credit score. Opening a savings account does not trigger a hard credit inquiry and does not affect your credit. Banks check your banking history through ChexSystems, a different system that tracks account closures and overdrafts, but a savings account inquiry will not hurt you.
Frequently Asked Questions
Do I have to pay taxes on interest I earn?
Yes. Interest income is taxable as ordinary income. Your bank will send you a Form 1099-INT at the end of the year 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 mid-month?
Interest is calculated on your daily balance for the entire month, so withdrawing money partway through reduces the amount of interest you earn that month. If you withdraw $5,000 on the 15th of a 30-day month, you earn interest on the full amount for 15 days and the reduced amount for the remaining 15 days. The interest is still posted on the normal date.
Can I move my money to a higher-paying bank without losing interest?
Yes. Interest is calculated through the last day of the month, so if you transfer money on the 20th, you still earn interest for those 20 days at your old bank. Your new bank starts paying interest the day the money arrives. There is no penalty for moving savings accounts, and your FDIC insurance follows you to the new bank.
Why is my interest rate lower than what the bank advertises?
The advertised rate usually applies only to new accounts or requires a minimum balance you may not have. Check your account agreement or call the bank to confirm what rate applies to your specific account. Rates can also vary slightly based on your state or account type.
Does keeping money in savings hurt my credit score?
No. Savings accounts do not appear on your credit report and do not affect your credit score. Only credit products like credit cards, loans, and lines of credit impact your score. Saving money has no downside to your credit.