Money market accounts hold your cash and pay you interest, but they come with limits on how often you can move the money out

A money market account is a hybrid between a savings account and a checking account. You deposit money, the bank or credit union holds it, and they pay you interest on the balance. In return, you can withdraw cash or write checks, but federal rules cap how many times per month you can make certain kinds of transfers — typically six per statement cycle. The account is FDIC-insured (at banks) or NCUA-insured (at credit unions) up to $250,000, so your principal is protected even if the institution fails.

The mechanics are straightforward: you deposit money, the bank lends that money to borrowers or invests it in short-term debt instruments, and they share a portion of the interest they earn with you. The rate you receive depends on the current interest rate environment, the bank's own rates, and how much money you keep in the account — many money market accounts offer higher rates on larger balances.

Key Takeaways

  • Money market accounts pay interest on your balance and are insured by the FDIC or NCUA up to $250,000, making them safer than keeping cash at home.
  • Federal rules limit you to six transfers or withdrawals per month (not counting ATM withdrawals or in-person withdrawals), so they are not meant for frequent access.
  • Interest rates on money market accounts fluctuate with the broader economy and vary widely between banks, so shopping around can mean hundreds of dollars in annual interest.
  • Money market accounts typically require a minimum deposit to open and may charge monthly fees if your balance falls below a threshold.

How the bank uses your money and pays you interest

When you deposit money into a money market account, the bank does not lock it in a vault with your name on it. Instead, the bank uses that money — along with deposits from thousands of other customers — to make loans to businesses and individuals, or to buy short-term bonds and other debt securities. The borrowers and bond issuers pay the bank interest on those loans and securities.

The bank keeps a portion of that interest as profit and passes the rest to you as your account interest. The rate you earn is set by the bank and can change at any time, though most banks adjust rates only when the Federal Reserve changes its benchmark rate. If rates are rising, your money market rate will usually rise within weeks. If rates are falling, your rate will fall as well — sometimes faster than it rose.

The six-transfer rule and what counts against your limit

Federal Regulation D historically capped transfers and withdrawals from money market accounts at six per month. In 2020, the Federal Reserve suspended this rule, but many banks and credit unions have kept it in place or reinstated it. Before opening an account, check the institution's disclosure to see whether the limit applies and what the penalty is for exceeding it — some banks charge a fee per excess transfer, while others may close the account or convert it to a savings account.

The rule applies to transfers — moving money to another account, either at the same bank or elsewhere — and withdrawals by check, debit card, or electronic means. It does not count ATM withdrawals or in-person withdrawals at a branch. So you can withdraw cash as often as you want, but you cannot move money out electronically more than six times per month without risking a fee or account closure.

Minimum deposits and monthly fees

Most banks require a minimum opening deposit to start a money market account — this ranges from $0 at some online banks to $2,500 or more at traditional banks. Some accounts also charge a monthly maintenance fee ($5 to $15 is common) unless your balance stays above a certain threshold, often $2,500 to $10,000. A few banks waive the fee if you set up direct deposit or maintain a linked checking account.

The fee structure matters because a high fee can erase months of interest earnings. If an account pays 4.50% annual interest on a $5,000 balance but charges a $10 monthly fee, you are paying $120 per year in fees against roughly $225 in annual interest — cutting your real return nearly in half. Always compare the interest rate, minimum balance, and fee structure together, not one at a time.

How interest rates change and what affects them

Money market account rates move in response to the Federal Reserve's actions. When the Fed raises its benchmark rate, banks have more incentive to offer higher rates to attract deposits. When the Fed cuts rates, banks lower their rates to savers. The lag between a Fed move and a rate change at your bank is usually one to four weeks, though some banks move faster than others.

Beyond the Fed, competition matters. Banks in areas with many competitors or online banks with low overhead often offer higher rates than large regional banks. A bank's own funding needs also play a role — if a bank needs deposits urgently, it may raise its money market rate to attract them. This is why the same account type can pay 4.00% at one bank and 5.25% at another, even in the same month.

FDIC and NCUA insurance protection

Money market accounts at banks are insured by the Federal Deposit Insurance Corporation (FDIC) up to $250,000 per depositor, per bank. If the bank fails, the FDIC pays you back up to that limit. Money market accounts at credit unions are insured by the National Credit Union Administration (NCUA) under the same $250,000 limit.

The insurance covers the account balance as of the date the bank or credit union fails, not the interest you would have earned going forward. If you have more than $250,000 to deposit, you can split it across multiple banks to keep all of it insured — for example, $250,000 at Bank A and $250,000 at Bank B. The insurance does not cover losses from fraud or theft if someone else gains access to your account, so keep your login credentials secure.

Money market accounts versus savings accounts and CDs

Money market accounts sit between savings accounts and certificates of deposit in terms of flexibility and rate. A savings account offers unlimited deposits and withdrawals (in practice, though Regulation D technically applied there too) but usually pays a lower interest rate. A CD locks your money for a set term — three months, one year, five years — and pays a fixed rate that is usually higher than a money market account, but you pay a penalty if you withdraw early.

A money market account gives you the ability to access your money via check or debit card without a penalty, but the six-transfer limit means it is not a substitute for a checking account. If you need to move money frequently or write many checks, a checking account is the right tool. If you want the highest rate and can lock money away, a CD is usually better. A money market account works best for money you want to keep safe and earning interest but may need to access a few times per month.

Frequently Asked Questions

Can I write checks from a money market account?

Yes, most money market accounts come with check-writing privileges, though some banks limit the number of checks you can write per month. Check with your bank about whether checks count against the six-transfer limit — at some institutions they do, at others they do not.

What happens if I exceed the six-transfer limit?

The penalty varies by bank. Some charge a fee per excess transfer (typically $5 to $10), while others may close the account or convert it to a savings account. A few banks no longer enforce the limit at all. Your account disclosure will state the bank's policy.

Is a money market account safe if the bank fails?

Yes, up to $250,000. The FDIC (for banks) or NCUA (for credit unions) insures the full balance if the institution fails. If you have more than $250,000, only the first $250,000 is protected at that institution.

Why do money market rates change so often?

Banks adjust rates in response to changes in the Federal Reserve's benchmark rate and to competition from other banks. When the Fed raises rates, banks raise their money market rates to attract deposits. When the Fed cuts rates, banks lower theirs.

Can I use a money market account as my main checking account?

Not practically. The six-transfer limit and the fact that many money market accounts charge fees for frequent activity make them unsuitable for everyday spending. Use a checking account for daily expenses and a money market account for money you want to earn interest on but may need to access occasionally.