What your savings account earns depends on the interest rate, how much you have in it, and how long the money sits there
A savings account earns money through interest—a percentage of your balance that the bank pays you for letting them use your money. The amount you earn is not fixed. It changes based on three things: the interest rate the bank offers, your account balance, and how long your money stays in the account.
Right now, savings account rates range widely. Some banks offer less than 0.01% annual interest, while others offer 4% to 5% or higher. The difference between a 0.01% account and a 5% account is enormous—on $10,000, you might earn $1 per year at the low end or $500 per year at the high end. The rate your bank pays you is called the Annual Percentage Yield (APY), and it's the number you need to find before you open an account.
Banks change their rates frequently, especially when the Federal Reserve changes its benchmark interest rate. If you opened a savings account two years ago at 0.01% APY, that rate is likely much lower than what new accounts earn today. You are not locked into your original rate—you can move your money to a different bank whenever you want.
Key Takeaways
- Your earnings depend on three factors: the interest rate (APY), your account balance, and how long the money stays deposited.
- Interest rates vary dramatically between banks—from under 0.01% to 5% or higher—so comparing rates before opening an account matters.
- Banks recalculate and credit interest monthly or daily, depending on the account, but the annual rate is what you use to estimate your earnings.
- Online banks typically offer higher rates than brick-and-mortar banks because they have lower overhead costs.
- Your earnings are taxable income, and the bank will send you a 1099-INT form if you earn $10 or more in a year.
How to calculate what you will earn
The basic formula is straightforward: multiply your balance by the APY, then divide by 12 to get your monthly earnings. If you have $5,000 in an account paying 4.5% APY, you earn roughly $187.50 per year, or about $15.63 per month.
The catch is that most banks use daily compounding, which means they calculate interest on your balance every single day, and then add that interest back into your account. When interest is added, the next day's calculation includes that interest, so you earn interest on your interest. This compounds over time, but the effect is small in the first few months.
You do not need to do this math yourself. When you look at an account online, the bank will show you the APY clearly. Some banks also show you an "interest calculator" tool where you enter your balance and it shows you estimated earnings over one year or five years. These calculators are accurate enough for planning purposes.
Why rates differ so much between banks
Online banks pay higher rates than traditional banks because they do not have the cost of physical branches, tellers, or as many employees. They pass those savings to customers through better rates. A bank with 500 branches nationwide might pay 0.01% APY, while an online-only bank pays 4.75% APY on the same type of account.
Banks also adjust their rates based on what the Federal Reserve does. When the Fed raises its benchmark rate, banks eventually raise what they pay on savings accounts. When the Fed cuts rates, banks cut what they pay you. The lag between a Fed move and a bank's response can be weeks or months.
Credit unions sometimes offer competitive rates too, though not always. If you belong to a credit union, check their savings rate against online banks before deciding where to put your money.
When interest is added to your account
Banks calculate interest daily but credit it to your account monthly, quarterly, or annually depending on the account. Most common savings accounts credit interest monthly. This means on the first day of each month, the bank adds that month's earned interest to your balance.
Some high-yield savings accounts credit interest daily, which sounds better but makes almost no practical difference. The total amount you earn over a year is the same whether interest is credited daily or monthly—the timing just shifts slightly.
You can see your interest earnings in your account statement or online banking portal. The statement will show a line item like "Interest Earned" with the dollar amount. This is also the number you will need when you file taxes.
How taxes affect your savings earnings
Interest earned in a savings account 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 too. The bank will send you a Form 1099-INT if you earned $10 or more in interest during the year. You receive this form by January 31 of the following year.
If you earned less than $10, the bank does not send a form, but you still owe tax on the interest. You can find your earnings in your account statement and report them yourself.
The tax you owe depends on your overall income and tax bracket. If you are in the 22% tax bracket and earn $500 in interest, you will owe roughly $110 in federal tax on that interest. This is why the difference between a 0.01% account and a 5% account matters—you keep more of what you earn at the higher rate, even after taxes.
Comparing rates across banks
The best way to find the highest rate is to check comparison sites that list current APY rates from multiple banks. These sites update frequently because rates change. You can also visit individual bank websites directly, though you will have to check several to compare.
When comparing, look for these details: the APY (not just "interest rate"), any minimum balance required to earn that rate, and whether the rate applies to new customers only or to all customers. Some banks offer a promotional rate for the first few months, then drop it significantly. Read the fine print.
Also check whether the bank charges monthly fees. A $10 monthly maintenance fee on a savings account earning $15 per month wipes out most of your gains. Most online banks have no monthly fees, but some traditional banks do.
What happens if you withdraw money before the end of the year
Savings accounts have no penalty for withdrawals—you can take your money out anytime without losing interest. Interest is calculated based on your balance each day, so if you withdraw $2,000 midway through the month, the next month's interest will be lower because your balance is lower.
This is different from a Certificate of Deposit (CD), which does penalize early withdrawal. In a savings account, you are free to move money in and out without consequence. This makes savings accounts useful for emergency funds or money you might need soon.
Frequently Asked Questions
Can I move my money to a higher-rate bank without losing interest I already earned?
Yes. Interest you have already earned belongs to you. When you transfer to a new bank, you take that interest with you. You only lose future interest if you close the account before the month ends, depending on the bank's policy—most credit interest on the last day of the month, so timing matters slightly.
What is the difference between APY and APR?
APY (Annual Percentage Yield) includes the effect of compounding and is what you use for savings accounts. APR (Annual Percentage Rate) does not include compounding and is used for loans and credit cards. Always look for APY when comparing savings accounts.
Do I have to report interest earnings under $10?
The bank does not send you a form, but you still owe tax on it. Report the interest on your tax return using your account statement as proof. The IRS expects you to report all income, regardless of whether you receive a form.
Will my interest rate stay the same forever?
No. Banks change rates whenever they choose, usually in response to Federal Reserve moves. Your rate can go up or down. If it drops significantly, you can move your money to a different bank with a higher rate.
Is a savings account a good place to keep money I will not need for years?
For money you will not touch for several years, a CD or money market account might earn more because they lock in a higher rate. Savings accounts are best for money you might need within a year or two, or for emergency funds you want to access quickly.