What $100,000 will earn depends entirely on your bank's interest rate
The amount of interest you earn on $100,000 depends on one thing: the annual percentage yield (APY) your bank offers. APY is the percentage of your money the bank pays you each year. A bank offering 4.5% APY will pay you roughly $4,500 per year on $100,000. A bank offering 0.01% APY will pay you about $10 per year on the same amount.
Right now, savings account rates vary widely. Online banks typically offer higher rates than brick-and-mortar banks — sometimes 4% to 5% APY — while traditional banks often offer less than 1%. The difference between these two is substantial: at 4.5% you earn $4,500 yearly; at 0.5% you earn $500 yearly on the same $100,000.
Your earnings also depend on how long the money sits in the account. Banks calculate interest daily but usually pay it monthly. The longer your money stays, the more interest compounds — meaning you earn interest on your interest. Over five years at 4.5% APY, $100,000 grows to roughly $125,000. At 0.5% APY over the same period, it grows to about $102,500.
Key Takeaways
- A $100,000 balance at 4.5% APY earns about $4,500 per year, while the same amount at 0.5% APY earns about $500 per year.
- Online banks currently offer higher interest rates than traditional banks, sometimes two to four times higher for the same deposit.
- Interest compounds monthly at most banks, meaning you earn small amounts of interest on the interest you've already earned.
- Your actual earnings depend on the specific APY your bank offers, which can change over time as the Federal Reserve adjusts rates.
How banks set the rates they pay you
Banks don't choose their savings rates randomly. They're tied to the federal funds rate, which is set by the Federal Reserve (the central bank of the United States). When the Fed raises its rate, banks typically raise what they pay on savings accounts. When the Fed lowers its rate, banks lower what they pay you.
However, banks don't move in lockstep. Online banks tend to pass rate changes to customers faster than traditional banks do. This is partly because online banks have lower overhead costs — no physical branches to maintain — so they can afford to pay more. A traditional bank might offer 0.3% APY while an online bank offers 4.8% APY during the same period.
The rate your bank pays also depends on how much money you deposit and how long you agree to keep it there. A regular savings account typically pays less than a certificate of deposit (CD), where you lock your money away for a set period — three months, six months, one year, or longer — in exchange for a higher rate.
Comparing what you'd actually receive over time
The difference between rates compounds quickly over years. Here's what $100,000 grows to under different scenarios, assuming the rate stays the same:
| APY Rate | After 1 Year | After 3 Years | After 5 Years |
|---|---|---|---|
| 0.5% | $100,500 | $101,507 | $102,527 |
| 2.0% | $102,000 | $106,121 | $110,408 |
| 4.5% | $104,500 | $114,117 | $125,141 |
| 5.0% | $105,000 | $115,763 | $127,628 |
These numbers assume you don't add or withdraw money and the rate doesn't change. In reality, rates do change — sometimes monthly. If you're shopping for a bank, compare the APY different institutions offer right now, but understand that the rate you see today may be different in six months.
Why some accounts pay more than others
A savings account at a traditional bank might pay 0.01% to 0.5% APY. The same $100,000 at an online bank might earn 4% to 5% APY. The difference isn't because one bank is being generous and another stingy — it's structural.
Online banks have lower costs. They don't maintain physical locations, employ as many staff members, or spend money on branch infrastructure. Those savings get passed to customers in the form of higher interest rates. Traditional banks have higher overhead, so they keep more of the interest spread for themselves.
Some accounts also pay more because they're money market accounts, which combine features of savings and checking accounts and often pay higher rates. Others are CDs, which lock your money away and pay more because the bank knows exactly how long it can use your funds.
What happens to your interest if rates drop
If you're earning 4.5% APY today and the Federal Reserve cuts rates, your bank will likely cut what it pays you. This doesn't happen when ready — some banks wait weeks or months — but it does happen. Your $100,000 earning $4,500 per year might drop to earning $2,000 per year if rates fall significantly.
This is one reason some people lock money into CDs. If you deposit $100,000 in a one-year CD at 4.5% APY, you're may provide to earn that rate for the full year, even if rates drop to 1% after three months. The tradeoff is that you can't touch the money without paying an early withdrawal penalty.
Regular savings accounts offer flexibility — you can move your money anytime — but no rate may provide. If you think rates might drop, a CD locks in today's higher rate. If you think rates might rise, a regular savings account lets you move to a better rate later.
How to find the best rate for your $100,000
Start by checking what online banks are currently offering. Websites that compare bank rates show APY across different institutions. Look at online banks first — they almost always pay more than traditional banks for the same type of account.
Next, decide whether you need access to the money. If you might need it within the year, a regular savings account or money market account makes sense. If you won't touch it for a year or more, a CD locks in a higher rate and removes the temptation to spend it.
Check whether the bank is FDIC insured. This means the federal government guarantees your deposit up to $250,000 if the bank fails. Nearly all legitimate banks are FDIC insured, but it's worth confirming. Your $100,000 is fully protected at any FDIC-insured bank.
Finally, read the fine print on CDs. Some charge penalties if you withdraw early. A one-year CD might charge three months of interest as a penalty if you pull money out after six months. Understand this cost before you commit.
Taxes on the interest you earn
The interest your bank pays you is taxable income. If you earn $4,500 in interest, you owe federal income tax on that $4,500 (and possibly state income tax, depending on where you live). Your bank will send you a form called a 1099-INT at tax time listing all the interest you earned.
This means your real earnings are less than the interest rate suggests. If you earn $4,500 in interest and you're in the 22% federal tax bracket, you'll owe roughly $990 in federal taxes on that interest. Your net gain is about $3,510, not $4,500.
Some people open savings accounts in the names of children or dependents to take advantage of lower tax brackets, but this gets complicated quickly and requires professional tax information. For most people, the simplest approach is to understand that interest is taxable and factor that into your decision about where to keep the money.
Frequently Asked Questions
Can I earn more than the APY shown?
No. The APY is the maximum you'll earn if the rate stays the same for a full year and you don't withdraw money. In reality, you may earn slightly less because interest is calculated daily but paid monthly, and rates can change. You won't earn more than the stated APY.
What if I split $100,000 across multiple banks?
You can do this, and some people do to maximize FDIC insurance protection. Each bank insures up to $250,000 per account holder, so splitting $100,000 across two banks doesn't change your insurance coverage — you're still fully protected at each bank. The main reason to split is to chase slightly higher rates at different institutions, though the difference is usually small.
Is a CD better than a savings account for $100,000?
It depends on whether you need the money. CDs typically pay 0.5% to 1% more than savings accounts, so a one-year CD might pay 5% while a savings account pays 4%. Over one year, that's $500 more on $100,000. But if you need the money before the CD matures, you'll pay an early withdrawal penalty that could wipe out those gains.
What if interest rates go up after I open my account?
If you have a regular savings account, your bank will eventually raise your rate as market rates rise — though not always when ready. If you have a CD, your rate is locked in for the term. You could open a new CD at the higher rate, but you'd have to wait for the first CD to mature or pay an early withdrawal penalty.
How often does my bank pay interest?
Most banks calculate interest daily and pay it monthly, meaning the interest gets added to your account once a month. Some banks pay quarterly or annually. Check your account agreement to see the schedule. Monthly is most common.