Quick answer: a money market deposit account (MMDA) is a bank deposit account; credit unions can offer similar insured share accounts. A money market mutual fund is a mutual fund. Federal deposit/share insurance does not turn a mutual fund into an insured deposit.
What is a money market deposit account?
An MMDA is a savings-type deposit account that may offer interest and transaction-access features. Rates, minimums, fees and access rules vary by institution.
What is a money market mutual fund?
A money market fund is an investment product, not a bank savings account. The FDIC does not insure mutual funds, and NCUA share insurance does not cover mutual funds merely because they are sold through a credit union or affiliated provider.
Why the distinction matters
If your goal is an emergency fund or short-term cash reserve, you should know whether you are opening an insured deposit/share account or buying an investment. Look beyond the words “money market” and identify the actual product and institution.
Money market account vs. HYSA
Both can be used for cash savings. Compare APY, fees, minimums, transfer speed, transaction features, and insurance. A HYSA is not automatically better, and a money market deposit account is not automatically better.
Money market account vs. CD
A money market deposit account generally keeps funds accessible under the institution's rules. A CD uses a defined term and can impose an early-withdrawal penalty. That makes the timing of your goal important.
What to verify
- Is this a deposit/share account or a mutual fund?
- Is the bank FDIC-insured or credit union federally insured?
- What APY, minimum-balance and fee rules apply?
- How quickly can you access the money?
Reviewed September 20, 2026. Sources: FDIC deposit insurance and NCUA share insurance guidance. General financial education.