How a money market savings account actually works
A money market savings account holds your cash and pays you interest, but the money does not sit idle. Your bank takes the deposits from all its account holders and lends that money out—to other customers for mortgages, to businesses for equipment, to governments for bonds. The interest you earn is a share of what the bank makes on those loans, minus what it costs the bank to run the account. The more money you keep in the account and the longer you keep it there, the more interest compounds.
The account is FDIC insured up to $250,000 per depositor per bank, which means if the bank fails, the government covers your balance. That protection is automatic; you do not need to do anything to activate it. The tradeoff for that safety and the interest you earn is that your money is not instantly available—most accounts let you make three to six withdrawals per month before fees kick in, though that limit has loosened in recent years.
Interest rates on money market accounts change based on what the Federal Reserve does with its benchmark rate. When the Fed raises rates, banks raise the rates they offer on savings accounts. When the Fed cuts rates, your interest rate falls. The rate your specific bank offers also depends on how much competition exists in your area and how much money the bank needs to attract right now.
Key Takeaways
- Your bank lends out the money you deposit and pays you a portion of the interest it earns, with your balance protected by FDIC insurance up to $250,000.
- Interest rates fluctuate with Federal Reserve policy and vary by bank, so comparing rates across institutions before opening an account matters.
- Most accounts limit you to three to six withdrawals per month; exceeding that limit usually triggers a fee of $10 to $35 per extra withdrawal.
- Money market accounts require a minimum deposit to open, which ranges from $0 to $25,000 depending on the bank and account tier.
- Interest compounds daily or monthly depending on the bank's terms, meaning you earn interest on your interest as well as your principal.
How interest accrues and compounds in your account
Interest does not arrive as a lump sum once a year. Instead, the bank calculates what you owe based on your daily balance and adds a small amount to your account on a set schedule—usually monthly or quarterly. That added amount is your accrued interest. The next time interest is calculated, you earn interest on the original balance plus the interest that was already added. That is compounding, and it is why the longer money sits in the account, the faster it grows.
The actual amount you earn depends on the annual percentage yield, or APY. This is the rate the bank advertises and the one you should compare across banks. APY already accounts for compounding, so a 4.50% APY means you will earn roughly 4.50% over a full year if you make no deposits or withdrawals. If you withdraw money mid-month, the interest calculation for that month is based on the lower balance, so timing matters when you are moving large sums.
Some banks offer tiered rates: higher APY if you maintain a larger balance. For example, balances under $10,000 might earn 4.00% APY, while balances over $100,000 earn 4.75% APY. Read the fine print to see whether your bank uses tiering and what the thresholds are.
Withdrawal limits and what happens when you exceed them
Federal rules used to cap withdrawals at six per month, but that rule was suspended in 2020 and has not been reinstated. However, most banks still impose their own limits—typically three to six withdrawals per month—and charge a fee if you go over. That fee is usually $10 to $35 per excess withdrawal. Some banks waive the fee for the first overage in a calendar year, but do not count on it.
The limit applies to withdrawals, not deposits. You can deposit money as often as you want without penalty. Transfers to another account at the same bank usually count as a withdrawal, but transfers to an external account (like a checking account at a different bank) always do. Debit card transactions and ATM withdrawals count as withdrawals too. Checks written against the account, if the bank allows them, also count.
If you regularly need to move money in and out, a money market account is not the right tool. A regular savings account or a checking account with interest is more flexible, though the interest rate will likely be lower. If you want the higher rate but need more access, ask your bank whether they offer a money market account with no withdrawal limits—some do, though the rate may be slightly lower to compensate.
Minimum deposits and account opening requirements
Most banks require a minimum deposit to open a money market account, ranging from $0 to $25,000. Online banks tend to have lower or no minimums because they have fewer physical branches and lower overhead. Traditional banks with brick-and-mortar locations often require $2,500 to $10,000 to open. Some banks waive the minimum if you set up automatic monthly deposits or maintain a linked checking account.
To open an account, you will need to provide your Social Security number, proof of identity (a driver's license or passport), and proof of address (a recent utility bill or bank statement). The bank will run a background check through ChexSystems, a database that tracks banking history. If you have unpaid overdrafts or fraud flags at other banks, you may be denied. You can request your ChexSystems report for free at www.chexsystems.com.
Some banks also require a minimum balance to keep the account open and earning the advertised rate. If your balance falls below that threshold, the rate drops to a lower tier or the account is closed. Check the account terms before you open to see what the maintenance requirement is.
How rates compare to other savings vehicles
Money market accounts typically offer higher interest than regular savings accounts at the same bank, but lower rates than certificates of deposit (CDs). A regular savings account at a major bank might pay 0.01% APY, while a money market account at the same bank might pay 4.50% APY. A one-year CD at that bank might pay 5.00% APY, but your money is locked in for the full year—if you withdraw early, you pay a penalty.
Money market accounts also pay less than money market funds, which are investment products sold through brokerages. Money market funds are not FDIC insured and carry a small amount of risk, but they often pay slightly higher rates because they invest in short-term government and corporate debt rather than holding cash. For most people saving for an emergency fund or a near-term goal, the FDIC protection of a money market savings account is worth the slightly lower rate.
High-yield savings accounts, offered by online banks, often match or beat money market account rates and offer more withdrawal flexibility. The tradeoff is that high-yield savings accounts do not come with a debit card or checkbook, so moving money out takes longer. If you need quick access to cash, a money market account is more convenient. If you are parking money for six months or longer and do not need to touch it, a high-yield savings account or a CD may pay more.
What happens to your money when interest rates change
When the Federal Reserve raises its benchmark rate, banks compete to attract deposits by raising the APY they offer on savings accounts. If you have a money market account, your rate will increase within days or weeks, though the bank is not required to pass along the full increase. When the Fed cuts rates, banks lower their APY on savings accounts, and your earnings shrink. You do not have to do anything—the rate change is automatic.
The lag between a Fed rate change and a bank rate change varies. Some online banks adjust within 24 hours. Traditional banks may take a week or two. During periods of rapid Fed rate changes, it pays to shop around and move your money to a bank offering a higher rate, though you will lose the interest accrued at your old bank if you close the account early (most banks do not penalize you for closing, but they do not pay out accrued interest that has not yet been credited).
If you lock in a rate by opening a CD instead, you are protected from rate cuts but you also miss out if rates rise. Money market accounts give you the flexibility to benefit from rising rates without locking your money away, which is why they are popular during periods of uncertainty about where rates are headed.
Fees and charges that reduce your earnings
The most common fee is the excess withdrawal fee, charged when you exceed your bank's monthly withdrawal limit. Other fees include a monthly maintenance fee (usually $5 to $15, though many banks waive it if you maintain a minimum balance), an overdraft fee if you somehow overdraw the account, and an inactivity fee if you do not make any transactions for a set period (usually 12 months). Some banks charge a fee to close the account within a certain timeframe, typically 90 days to one year after opening.
Read the fee schedule before you open an account. Many online banks advertise zero monthly fees and no minimum balance, which is a real advantage if you are comparing to a traditional bank. If a bank charges a $10 monthly maintenance fee and you earn $15 in interest per month, you are only netting $5. Over a year, that fee eats into your returns significantly.
Some banks waive fees for customers who maintain a linked checking account, set up direct deposit, or keep a minimum balance. If you already bank somewhere, ask whether they offer fee waivers for money market account holders. It may be worth opening at your existing bank even if the rate is slightly lower, because the fee savings could offset the difference.
Frequently Asked Questions
Can I use a debit card to withdraw money from a money market account?
Most banks issue a debit card with money market accounts, but each debit card transaction counts as a withdrawal against your monthly limit. If your bank allows six withdrawals per month and you use the debit card four times, you have two withdrawals left before fees apply. Some banks do not issue debit cards for money market accounts at all—check before you open.
What happens if I need to withdraw all my money at once?
You can withdraw your entire balance, but if you exceed the monthly withdrawal limit, you will pay a fee for each excess withdrawal. The fee is usually $10 to $35 per transaction. The money itself is yours and will be transferred within one to three business days. The fee is the only penalty; the bank cannot refuse to let you withdraw your own money.
Is a money market account safer than keeping cash at home?
Yes. Your balance is insured by the FDIC up to $250,000, so even if the bank fails, you are protected. Cash at home is not insured against theft, fire, or loss. The only downside is that you cannot access the money instantly—transfers take one to three business days—but for money you do not need immediately, a money market account is far safer.
How do I know if a money market account is better than a high-yield savings account?
Compare the APY first—if they are the same, the money market account wins because it includes a debit card and checkbook for faster access. If the high-yield savings account pays more, calculate whether the extra interest over a year outweighs the inconvenience of slower withdrawals. For most people, the difference is small enough that convenience matters more than an extra 0.25% APY.
Can I move money between my money market account and checking account without it counting as a withdrawal?
Transfers between accounts at the same bank usually count as a withdrawal. Transfers to an external account (a different bank) always count. If you need frequent access to your money, ask your bank whether they offer a money market account with unlimited transfers or no withdrawal limits—some do, though the rate may be lower.