What $100,000 earns depends entirely on the interest rate your bank offers
A $100,000 deposit in a savings account will earn between roughly $500 and $5,000 per year, depending on which bank you choose and what type of account you open. The difference comes down to the annual percentage yield (APY) — the rate the bank pays you for keeping money there. A bank offering 0.5% APY will pay you $500 per year. A bank offering 5% APY will pay you $5,000 per year. The same deposit, the same time frame, completely different money in your pocket.
The rate you get is not set by law or by how much you deposit. It is set by the individual bank, and it changes. Banks that offer higher rates are usually online-only institutions with lower overhead costs. Banks with physical branches in your neighborhood typically offer lower rates. Your job is to shop around, because the difference between a 0.5% account and a 5% account is $4,500 per year on $100,000 — money you simply leave on the table if you do not look.
Key Takeaways
- Interest earned on $100,000 ranges from roughly $500 to $5,000 per year depending on the APY the bank offers, and rates change frequently.
- Online banks typically offer higher APY than traditional banks with physical branches, sometimes 10 times higher for the same deposit.
- Interest compounds daily at most banks, meaning you earn money on the interest you already earned, but the effect is small on shorter timescales.
- The rate you see today may not be the rate you get next month, so checking current rates before you deposit is the only way to know what you will actually earn.
- Certificates of deposit (CDs) lock your money away for a set time but often pay higher rates than regular savings accounts.
How the math works: APY, compounding, and what you actually receive
Banks express their interest rate as an annual percentage yield, or APY. This is the percentage of your balance the bank will pay you over one year. If your APY is 4%, you earn 4% of $100,000, which is $4,000. If your APY is 0.5%, you earn 0.5% of $100,000, which is $500.
Most banks compound interest daily, meaning they calculate what you owe you once per day and add it to your balance. On a $100,000 deposit at 4% APY, that works out to roughly $10.96 per day. The next day, you earn interest on $100,010.96, not just the original $100,000. Over a full year, daily compounding adds a small amount more than simple interest would — but on a one-year timeline, the difference is negligible. Over five years or ten years, it becomes more noticeable.
The bank deposits the interest into your account automatically, usually monthly or daily depending on the bank. You do not have to do anything to receive it. You can withdraw it, leave it there to compound, or move it to another account.
Why rates vary so widely between banks
The Federal Reserve sets a target interest rate that influences what banks pay, but it does not dictate the exact rate any individual bank offers. Banks decide their own APY based on how much they need to attract deposits and how much it costs them to operate.
Online banks like Marcus, Ally, and American Express Personal Savings typically offer rates 5 to 10 times higher than brick-and-mortar banks. They have no physical branches, no tellers, and no rent on a downtown office building. Those savings get passed to you as higher interest rates. A traditional bank with branches in your city might offer 0.01% to 0.5% APY. An online bank might offer 4% to 5.35% APY on the exact same type of account.
Banks also change their rates frequently — sometimes weekly. When the Federal Reserve raises rates, banks usually raise their savings rates within days or weeks. When the Fed cuts rates, banks cut theirs more slowly, because they want to keep your deposits. If you see a rate you like, moving your money quickly matters, because that rate may not be there next week.
Comparing savings accounts versus money market accounts versus CDs
A regular savings account is the simplest option: you deposit money, it earns interest at whatever rate the bank offers, and you can withdraw it anytime without penalty. On $100,000 at 4.5% APY, you earn $4,500 per year and can access your money whenever you need it.
A money market account is a hybrid. It works like a savings account but often pays a slightly higher rate — sometimes 0.25% to 0.5% more. The trade-off is that most money market accounts limit how many withdrawals you can make per month (usually six). If you need to access your money frequently, a regular savings account is simpler.
A certificate of deposit (CD) locks your money away for a set period — typically three months, six months, one year, or five years. In exchange, the bank pays you a higher rate. A one-year CD might pay 5.0% APY while a regular savings account at the same bank pays 4.5%. On $100,000, that extra 0.5% is $500 per year. The catch: if you withdraw the money before the CD matures, you pay a penalty, usually equal to several months of interest. CDs make sense if you know you will not need the money for that period.
| Account Type | Typical APY Range | Access to Money | Best For |
|---|---|---|---|
| Regular Savings Account | 0.01% to 5.35% | Anytime, no penalty | Money you might need soon |
| Money Market Account | 0.5% to 5.5% | Limited withdrawals per month | Money you access occasionally |
| Certificate of Deposit (CD) | 4.5% to 5.5% | Locked for set term; penalty if withdrawn early | Money you will not need for months or years |
How to find the current best rate for your $100,000
The best rate today is not the best rate next month, so checking before you move your money matters. Start by visiting the websites of online banks directly — Marcus, Ally, American Express Personal Savings, Discover, and Capital One 360 all publish their current rates on their home pages. Write down the APY and the account type (savings, money market, or CD).
Then check a rate comparison site like Bankrate, DepositAccounts, or DepositRate. These sites list rates from dozens of banks and update them frequently. You can filter by account type and sort by APY. The highest rate listed is usually from a smaller online bank you may not have heard of — that is normal. Smaller banks often pay more to attract deposits.
Before you deposit, verify the rate on the bank's own website. Comparison sites are usually accurate but can lag by a day or two. Also check whether the bank is FDIC-insured — this means your deposit is protected up to $250,000 if the bank fails. Every bank mentioned here is FDIC-insured, but it is worth confirming.
What happens to your interest if rates drop or rise
If you have money in a regular savings account and the bank lowers its rate, your interest earnings drop immediately. The bank does not have to notify you in advance. Your APY simply changes, and the next day you earn less. This is why shopping around matters — if your current bank drops its rate to 0.5% and another bank is offering 4.5%, moving your $100,000 costs you nothing and gains you $4,000 per year.
If rates rise and your bank does not raise its rate to match, you are losing money by staying there. Banks do not automatically match competitor rates. You have to move your money yourself. The process is simple: open an account at the new bank, transfer your $100,000 from the old bank, and close the old account. Most banks can initiate the transfer for you, and it usually takes three to five business days.
If you have money locked in a CD and rates rise, you are stuck at the lower rate until the CD matures. This is the main downside of CDs. If you have money in a savings account and rates rise, you benefit immediately — the bank's new, higher rate applies to your balance right away.
Taxes on the interest you earn
Interest you earn on a savings account is taxable income. If you earn $4,000 in interest over a year, you owe federal income tax on that $4,000. Your tax bracket determines how much you owe — if you are in the 24% bracket, you owe roughly $960 in federal tax on $4,000 of interest.
The bank will send you a Form 1099-INT in January showing how much interest you earned the previous year. You report this on your tax return. Some states also tax interest income, so check your state's rules.
This is why the after-tax return matters. A 5% APY sounds great until you realize that after taxes, you are keeping maybe 3.5% to 4% depending on your tax bracket. This does not change what you should do — you still want the highest rate available — but it is worth understanding that some of your earnings go to taxes.
Frequently Asked Questions
Will my $100,000 earn more in a CD or a savings account?
A CD usually pays 0.25% to 0.75% more than a savings account at the same bank. On $100,000, that is $250 to $750 per year. The trade-off is that you cannot withdraw the money without paying a penalty. If you will not need the money for at least one year, a CD is worth considering.
How often does the interest get added to my account?
Most banks add interest daily or monthly. Daily compounding means you earn interest on your interest more frequently, but the difference is small on a one-year timeline. Check your bank's disclosure to see whether it compounds daily or monthly.
Can I move my money to a different bank if the rate drops?
Yes, and there is no penalty for moving money from a regular savings account. The process takes three to five business days. If your money is in a CD, you will pay an early withdrawal penalty if you move it before the CD matures — usually equal to several months of interest.
What if the bank goes out of business?
Your deposit is protected up to $250,000 by FDIC insurance. If the bank fails, the FDIC pays you the full amount of your deposit plus any interest earned up to that point. This protection applies to all the banks mentioned in this guide.
Is there a minimum deposit to get the highest rate?
Most banks offer the same APY regardless of deposit size — a $100,000 deposit earns the same rate as a $1,000 deposit. Some banks offer slightly higher rates for larger deposits, but this is uncommon. Check the bank's website to confirm there is no minimum deposit requirement.