The money market rate is the interest rate your bank pays you on the balance in a money market account, and it changes based on what the Federal Reserve does with its benchmark rate.
When you open a money market account, the bank promises to pay you a percentage of your balance each month or quarter. That percentage is the money market rate. It is not fixed — it moves up and down, usually within weeks of a Federal Reserve decision, because banks use the Fed's rate as their starting point for what they offer you.
The rate you see advertised is what the bank is offering right now. If you lock in a money market account today at 4.50%, that rate will not stay at 4.50% forever. When the Fed raises rates, banks raise what they pay you. When the Fed cuts rates, your earnings shrink. This is different from a certificate of deposit (CD), where your rate is locked in for the full term.
Key Takeaways
- Money market rates are set by individual banks and move in response to Federal Reserve rate changes, not by a central authority.
- The rate you see advertised is current only at that moment — it can change weekly or monthly depending on the bank's policy.
- Higher rates are usually available at online banks and credit unions than at brick-and-mortar banks, because their overhead costs are lower.
- Your actual earnings depend on both the rate and your balance, so a 0.50% difference between banks compounds significantly over a year.
How the Federal Reserve influences what banks pay you
The Federal Reserve sets a target range for the federal funds rate — the rate banks charge each other for overnight loans. Banks do not have to follow this rate exactly, but they use it as a reference point. When the Fed raises its target range, banks raise the rates they offer on savings products, including money market accounts. When the Fed cuts its target range, banks cut what they pay you.
The lag between a Fed decision and a rate change at your bank is usually a few days to a few weeks. Some banks move faster than others. Online banks often adjust within days; traditional banks sometimes take longer. This means if you are watching rates closely and the Fed just raised its target, you might see better offers appear at online institutions before your current bank updates its rate.
Why different banks offer different money market rates
Even though all banks respond to the same Federal Reserve rate, they do not all offer the same money market rate. A bank's overhead — the cost of maintaining branches, paying tellers, running customer service — affects what it can afford to pay you. Online banks with no physical locations can offer higher rates because they spend less on operations. Credit unions, which are member-owned rather than shareholder-owned, often offer competitive rates as well.
Banks also set rates based on how much money they need to attract. If a bank has plenty of deposits and does not need more, it may offer a lower rate. If a bank is trying to grow its deposit base, it may offer a higher rate to pull in new customers. This is why you will see rates vary by 0.25% to 1% or more across different institutions on any given day.
The difference between advertised rates and the rate you actually get
The rate you see on a bank's website is the rate new customers can open an account at right now. Once you open the account, your rate is not locked in. It floats with the bank's current offering. If the bank raises its rate next month, your account does not automatically move up — you only earn the new rate on deposits you make after the change, or if the bank explicitly raises all existing accounts.
Some banks do raise rates on existing accounts when market conditions improve, but they are not required to. Read the account terms or call the bank to ask whether existing balances earn the same rate as new deposits. This matters most when rates are rising — you want to know whether you will benefit from the increase or whether you are stuck at an older, lower rate.
How to compare money market rates across banks
Comparing rates means looking at three things: the current rate, how often it changes, and what minimum balance the rate requires. A bank offering 4.75% on balances of $100,000 or more is not the same offer as 4.75% on any balance. Some banks also tier their rates — you might earn 4.50% on the first $50,000 and 4.75% on anything above that.
Check the rate at your current bank, then check rates at two or three online banks and a local credit union. Write down the rate, the minimum balance requirement, and the date you checked. Rates change frequently, so a comparison from last week is not reliable. If you find a bank offering 0.50% or more above your current rate, the difference adds up — on a $25,000 balance, 0.50% more per year is $125 in additional earnings.
What happens to your money market rate when the Fed cuts rates
When the Federal Reserve lowers its target rate, banks lower what they pay on money market accounts. This usually happens within days or weeks. Your balance does not disappear, but your monthly or quarterly earnings shrink. If you were earning $100 per quarter at 4.50%, you might earn $75 per quarter after the bank cuts the rate to 3.50%.
This is why some people move money to CDs when they expect rates to fall — a CD locks in the current rate for a set term, so you keep earning that rate even if the Fed cuts. A money market account is better if you think rates will rise or if you want to keep your money accessible without a penalty for early withdrawal.
Money market rates versus savings account rates
Money market accounts usually pay more than regular savings accounts at the same bank, often by 0.25% to 0.75%. The trade-off is that money market accounts usually require a higher minimum balance — sometimes $2,500 or $10,000 — and may limit how many withdrawals you can make per month. A regular savings account is more flexible but pays less.
If you have a small balance or need frequent access to your money, a savings account might make sense despite the lower rate. If you have $10,000 or more sitting aside and do not need to touch it regularly, a money market account will earn you more over time. The difference compounds — at 4.50% versus 3.75%, an extra $10,000 earns about $75 more per year.
Frequently Asked Questions
Can I lock in a money market rate so it does not go down?
No. Money market accounts have floating rates that change at the bank's discretion. If you want a locked-in rate, you need a certificate of deposit (CD). A CD fixes your rate for a set term — three months, one year, five years — and you earn that rate regardless of what the Fed does. The trade-off is that you cannot withdraw the money without a penalty until the term ends.
How often do money market rates change?
Rates can change weekly, monthly, or whenever the bank decides. There is no set schedule. Most banks adjust rates within days or weeks of a Federal Reserve decision, but some move faster than others. Online banks tend to adjust more frequently because they monitor the market closely and want to stay competitive. Check your bank's website or call to see how often they update rates.
Is the money market rate the same at every bank?
No. Every bank sets its own rate based on its costs, how much money it needs, and market competition. On the same day, one bank might offer 4.50% while another offers 4.75%. Online banks and credit unions often offer higher rates than traditional banks because they have lower overhead. Comparing rates across at least three institutions usually shows you the range available.
What if my bank lowers the rate on my existing account?
Your money stays in the account and continues to earn interest at the new rate. You are not penalized for a rate cut — the bank simply pays you less going forward. If you are unhappy with the new rate, you can move your money to another bank offering a higher rate. There is no penalty for closing a money market account, though some banks require you to keep a minimum balance to avoid a monthly fee.
Do I pay taxes on money market interest?
Yes. Interest earned on a money market account is taxable income. Your bank will send you a 1099-INT form at the end of the year showing how much interest you earned, and you report that on your tax return. The amount you owe in taxes depends on your tax bracket. This is one reason why the actual return on a money market account is slightly lower than the advertised rate — you keep only what remains after taxes.