A money market deposit account is a bank savings account that pays interest based on current market rates, with limits on how often you can withdraw

A money market deposit account (MMDA) sits between a regular savings account and a money market fund. Your bank holds the money, it's insured by the FDIC up to $250,000, and you earn interest that moves with the market. The catch: you can make only a limited number of withdrawals per month—usually six—before the bank charges you a fee or closes the account.

The interest rate is higher than a standard savings account because the bank uses your money to buy short-term debt like Treasury bills and commercial paper. When those rates go up, your rate goes up. When they fall, so does yours. You don't pick what the bank buys; you just benefit from the yield.

Most MMDAs require a minimum deposit to open—often $2,500 to $10,000, though some banks go lower. A few charge monthly maintenance fees if your balance drops below that minimum. Others waive fees entirely if you keep the balance high enough.

Key Takeaways

  • Money market deposit accounts earn interest tied to current rates, so your earnings change as the Federal Reserve adjusts its benchmark rate.
  • You can withdraw money only a limited number of times per month—typically six—before facing fees or account closure.
  • Your money is FDIC-insured up to $250,000, which makes MMDAs safer than money market mutual funds.
  • Minimum deposits usually range from $2,500 to $10,000, and some banks charge monthly fees if your balance falls below that threshold.
  • An MMDA works best if you have money you won't need to touch often but want to earn more than a savings account pays.

How the withdrawal limit works in practice

Federal rules allow six withdrawals per month from an MMDA. This includes transfers to another account, checks you write, and debit card transactions. Withdrawals at an ATM or in person at a branch usually don't count toward the limit, but transfers out do.

If you hit the limit, the bank can charge you a fee—typically $25 to $35 per excess withdrawal. Some banks close the account after repeated violations. A few banks have stopped enforcing the limit strictly, but don't assume yours has. Call and ask before you open the account if you think you'll need more flexibility.

The limit exists because banks use MMDA deposits to buy short-term securities. They need to know roughly how much cash will stay in the account so they can plan their purchases. Frequent withdrawals make that planning harder.

Interest rates and how they change

An MMDA's rate is not fixed. It moves when the Federal Reserve changes its benchmark rate, usually within a few weeks. When the Fed raises rates, banks raise MMDA rates to compete for deposits. When the Fed cuts rates, MMDA rates fall.

The actual rate you get depends on the bank and your balance. A large bank might pay 4.50% on balances over $100,000 and 3.75% on smaller balances. A credit union or online bank might pay 4.75% across all balances. Rates change without notice, so check your statement or log in online to see what you're earning now.

Because rates move with the market, an MMDA is not a good place to lock in a may provide return. If you want to know exactly what you'll earn, a certificate of deposit (CD) fixes the rate for a set term. An MMDA is better if you think rates will stay high or rise further.

FDIC insurance and what it covers

Money in an MMDA at a bank is insured by the FDIC up to $250,000 per depositor, per bank. If the bank fails, the FDIC pays you back in full up to that limit. This is different from a money market mutual fund, which has no government insurance—if the fund's investments lose value, your money loses value too.

The $250,000 limit applies to all deposit accounts you hold at the same bank combined. If you have a checking account with $100,000 and an MMDA with $200,000 at the same bank, only $250,000 total is insured. The other $50,000 is not protected if the bank fails.

If you have more than $250,000 to deposit, you can open accounts at different banks and each will be insured separately. Some people use a service called InvestorDepositGuard to track their FDIC coverage across multiple banks.

Minimum deposits and monthly fees

Most banks require between $2,500 and $10,000 to open an MMDA. Online banks sometimes go lower—$500 or even $0. Credit unions often have lower minimums than large national banks.

If your balance falls below the minimum, the bank may charge a monthly fee of $10 to $25. Some banks waive the fee if you maintain the minimum. Others charge the fee but don't close the account. A few have no minimum at all and no fee.

The fee matters more than it sounds. If a bank charges $15 per month and you're earning 4.50% on a $5,000 balance, the fee eats up about 4% of your annual interest. Shop around—an online bank with no minimum and a higher rate will almost always beat a traditional bank with a high minimum and a fee.

When an MMDA makes sense versus other accounts

An MMDA works best if you have $5,000 or more sitting in savings, you won't need to touch it often, and you want to earn more than a regular savings account pays. The higher rate compensates for the withdrawal limit.

Choose a CD instead if you know you won't need the money for a specific period—say, six months or a year—and you want to lock in a rate. CDs usually pay slightly more than MMDAs because you give up access for longer.

Choose a high-yield savings account if you need to withdraw money more than six times a month. Most high-yield savings accounts have no withdrawal limit and pay nearly as much as an MMDA. The trade-off is slightly lower rates, but the flexibility is worth it for many people.

Choose a money market mutual fund only if you have a large amount ($50,000 or more) and you're comfortable with the risk that the fund's value can go down. Mutual funds sometimes pay slightly more than MMDAs, but they have no FDIC insurance.

How to open an MMDA and what to watch for

To open an MMDA, you'll need a government ID, your Social Security number, and proof of address (a recent utility bill or bank statement). Most banks let you open online in 10 to 15 minutes. You'll fund the account by transferring money from another bank or mailing a check.

Before you open, confirm three things: the current interest rate, the minimum deposit, and whether the bank charges a monthly fee. Ask whether the bank enforces the six-withdrawal limit strictly or has relaxed it. Read the account agreement to see what counts as a withdrawal—some banks count transfers but not ATM withdrawals, and the rules vary.

After you open, set a calendar reminder to check your rate every three months. If your bank's rate falls significantly below competitors, move the money to a bank paying more. Banks count on inertia; switching takes 10 minutes and can earn you hundreds of dollars per year.

Frequently Asked Questions

Can I write checks on a money market deposit account?

Most banks let you write checks on an MMDA, but the checks count toward your six-withdrawal limit. Some banks limit you to three checks per month. Read your account agreement or call the bank to confirm how many checks you can write before hitting the limit.

What happens if I exceed the withdrawal limit?

The bank will charge you a fee, usually $25 to $35 per excess withdrawal. If you repeatedly exceed the limit, the bank may convert your account to a regular savings account or close it. Call your bank before you open the account if you think you'll need more than six withdrawals per month.

Is a money market deposit account the same as a money market mutual fund?

No. A money market deposit account is a bank product insured by the FDIC. A money market mutual fund is an investment that buys short-term debt securities and has no insurance. The MMDA is safer; the mutual fund sometimes pays slightly more but can lose value.

Do I pay taxes on MMDA interest?

Yes. Interest earned on an MMDA is taxable income. Your bank will send you a 1099-INT form in January showing how much interest you earned. You report this on your tax return. The interest is taxed at your ordinary income rate, not at the capital gains rate.

Can I move money between my MMDA and checking account without hitting the withdrawal limit?

Transfers between accounts at the same bank usually count as withdrawals and do count toward the limit. Some banks treat transfers differently than withdrawals, so call and ask. If you need frequent access to your money, a high-yield savings account is a better choice.