Interest is how banks pay you to keep money with them
A savings account earns money through interest — a percentage of your balance that the bank adds to your account regularly. The bank uses your deposited money to lend to other customers, and they pay you a small share of what they earn from those loans. The more money you keep in the account and the higher the interest rate, the more you earn.
Interest is usually calculated daily but added to your account monthly or quarterly, depending on the bank. You do not have to do anything to earn it — the bank handles the math automatically. The money becomes part of your balance and earns interest itself the next period, a process called compounding.
Key Takeaways
- Interest rates on savings accounts vary widely between banks, from nearly zero at some large banks to 4% or higher at online banks, so comparing rates before opening an account matters.
- The interest you earn depends on three things: the account's rate, how much money you keep in it, and how long it stays there.
- Online banks and credit unions typically offer higher rates than traditional brick-and-mortar banks because they have lower operating costs.
- Money market accounts and certificates of deposit (CDs) are alternatives that may pay more interest if you can leave money untouched for a set period.
Interest rates differ dramatically between banks
The rate your bank offers on a savings account is not set by law — each bank chooses its own. A large national bank might offer 0.01% annual interest, meaning you earn one cent per year on every $100 in the account. An online bank might offer 4% or higher on the same $100, earning you $4 per year. The difference compounds over time, especially if you are saving larger amounts.
Rates change frequently, sometimes weekly. Banks raise rates when the Federal Reserve increases its benchmark rate, and they lower rates when the Fed cuts. You can check current rates on bank websites, comparison sites, or by calling the bank directly. If your current bank's rate drops significantly below what competitors offer, you can move your money to a higher-paying account — there is no penalty for switching banks.
How much you actually earn depends on your balance and time
The formula is straightforward: more money in the account for longer earns more interest. If you keep $1,000 in an account paying 4% annual interest, you earn about $40 per year (before any fees). If you keep $10,000 in the same account, you earn about $400 per year. If you withdraw $5,000 halfway through the year, you earn less because the interest is calculated on your daily balance.
Compounding means your interest earns interest too. If your bank adds interest monthly, that interest when ready starts earning interest the next month. Over years, this effect becomes noticeable. A $10,000 deposit at 4% annual interest, left untouched for five years, grows to about $12,167 — the extra $167 comes entirely from compounding.
Online banks and credit unions usually pay more than traditional banks
Online banks have lower costs than banks with physical branches — no building rent, fewer employees, no teller windows. They pass some of those savings to customers through higher interest rates. A traditional bank with branches in your city might offer 0.05% on savings, while an online bank offers 4.5% on the same type of account.
Credit unions, which are member-owned rather than shareholder-owned, also tend to offer competitive rates. You must be a member to open an account, but membership is often open to anyone in a certain geographic area, profession, or employer. If you work for a large employer or live in a city, there is likely a credit union you can join.
The tradeoff is convenience: online banks have no physical location, so deposits happen by mail or mobile app, and withdrawals take a few business days. If you need cash when ready, a local bank or credit union is more practical. If you are saving money you do not need to touch often, the higher rate at an online bank usually makes up for the slower access.
Money market accounts and CDs pay more if you lock money away
A money market account is a hybrid between a savings account and a checking account. It typically pays higher interest than a regular savings account but limits how many withdrawals you can make per month. If you can leave most of your money untouched, a money market account might earn you more.
A certificate of deposit (CD) is an agreement to leave money in the bank for a set time — three months, one year, five years, or longer. In exchange, the bank pays a higher interest rate than a savings account. If you withdraw the money before the term ends, you pay a penalty, usually a few months of interest. CDs work well for money you know you will not need for a specific period, like a down payment you are saving for over two years.
Fees can erase your interest earnings
Some savings accounts charge monthly maintenance fees, overdraft fees, or fees for falling below a minimum balance. A $10 monthly fee on an account earning $5 per month in interest means you are losing money. Before opening an account, check the fee schedule on the bank's website or ask directly. Many online banks and credit unions charge no monthly fees at all.
If your current account has fees that are eating into your interest, moving to a no-fee account at a higher-rate bank is usually worth the effort. The switch takes about a week — you open the new account, transfer your money, and close the old one.
Frequently Asked Questions
Is the interest I earn on a savings account taxed?
Yes. Interest income is taxable as regular income on your federal and state tax returns. Banks send you a 1099-INT form each January showing how much interest you earned the previous year. The amount is usually small unless you have a large balance or a very high rate, but you still need to report it.
What is the difference between APY and APR?
APY (annual percentage yield) includes the effect of compounding and shows what you actually earn over a year. APR (annual percentage rate) does not include compounding. Banks are required to show you the APY, which is the number that matters for savings accounts. For a savings account, always compare APY rates between banks.
Can I move my money to a higher-rate account without losing interest?
Yes. Interest accrues daily, so you earn interest right up until the day you withdraw. When you move to a new bank, you do not lose any interest you have already earned. The old bank will send you a 1099-INT at tax time showing all interest earned while your money was there.
What happens if the bank fails?
Your deposits are insured by the FDIC (Federal Deposit Insurance Corporation) up to $250,000 per account holder per bank. If the bank closes, the FDIC returns your money. Credit union deposits are insured similarly through the NCUA (National Credit Union Administration). This protection is automatic — you do not need to do anything.
Should I move my money to chase a higher rate?
If the rate difference is significant (more than 1% higher) and you have a substantial balance, moving is usually worth it. The time it takes to open an account and transfer money is minimal. However, if you have only a few hundred dollars, the extra earnings might be small. Consider your comfort level with online banking and whether you need quick access to cash.