Money Market Account vs Money Market Fund
A money market deposit account is a bank or credit-union deposit that can qualify for federal deposit insurance, while a money market fund is a mutual fund whose shares can lose value and are not FDIC-insured.
Timeline
- Identify the product: Confirm whether the disclosure says deposit account or mutual fund and identify the bank, credit union or fund issuer.
- Verify protection: Check FDIC or NCUA eligibility and aggregated balances for a deposit; read the prospectus and understand investment risk for a fund.
- Test access: Review withdrawal limits, settlement, check or debit features, minimums, fees and the time needed to reach a spending account.
A money market deposit account, often abbreviated MMDA, is a deposit product offered by a bank or credit union. A money market fund is a mutual fund that invests in short-term debt instruments. Both may seek to provide income and convenient access to cash, but the shared words do not make them the same product. The account agreement or fund prospectus should state clearly which structure is being offered. [1][2]
Eligible MMDAs at an FDIC-insured bank receive deposit insurance together with the customer's other deposits in the same ownership category. The standard coverage limit is $250,000 per depositor, per insured bank, for each ownership category; opening several account types at one bank does not create a separate limit for each. Federally insured credit unions provide comparable NCUA share insurance under their rules. Verify the institution and ownership arrangement rather than relying on an app's logo. [1][3]
A money market fund is an investment, not an insured deposit. Many funds seek a stable $1 net asset value, while some use a floating value, but a stable target is not a guarantee. A fund can lose value or, in rare cases, 'break the buck.' FDIC insurance does not cover mutual-fund losses. Brokerage-custody protections, where applicable, also do not insure an investor against a decline in the fund's market value. [2][4]
Access varies by provider. An MMDA may offer checks, a debit card or electronic transfers, yet a bank can impose withdrawal limits or excessive-use fees under its account terms. A money market fund is bought and redeemed as fund shares; cash may require a redemption and settlement step before it can be spent, even when a brokerage supplies check-writing or a debit feature. Cutoff times, weekends and intermediary transfers can matter in an emergency. [1][2][5]
Yields on both products generally move with short-term rates and can change. For a deposit, compare annual percentage yield, balance tiers, maintenance fees and promotional conditions. For a fund, review its current yield using the stated method, expense ratio, portfolio, share class and any liquidity fee or redemption provision described in the prospectus. Two percentages calculated under different conventions should not be assumed to represent identical returns. [2][5][6]
Risk also extends beyond the headline promise. An MMDA balance above its applicable insurance limit depends on the bank's creditworthiness. A fund owns securities whose prices, liquidity and income can change, and inflation can exceed either product's yield. Government money market funds, prime funds and tax-exempt funds can hold different assets and follow different valuation or liquidity rules, so the category name alone is incomplete. [2][3]
For cash needed immediately, start with protection and access rather than whichever product advertises the highest recent yield. Verify how quickly funds reach the bill-paying account, keep insured deposits within applicable limits and read a fund's prospectus before investing. Recheck features after a provider changes rates or fees. This U.S.-focused comparison does not replace local rules in other countries or individualized tax and investment advice. [1][2][3][6]
Sources
- FDIC — Deposit Accounts
- Investor.gov — Money Market Funds: Investor Bulletin
- FDIC — Deposit Insurance
- FDIC — Financial Institution Employee's Guide to Deposit Insurance
- Consumer Financial Protection Bureau — Savings Account Transaction Fees
- Consumer Financial Protection Bureau — Truth in Savings Regulation DD