Money Market Account vs Money Market Fund: Insurance and Access

Money market account vs money market fund describes a bank deposit compared with a mutual fund investment. An eligible deposit at an FDIC-insured bank receives deposit insurance within the coverage limits. A money market fund receives no FDIC insurance, even when you access it through a bank or use it for brokerage cash. SIPC protection at a member brokerage addresses missing customer assets when the firm fails; it does not reimburse investment losses.

Start with the product's legal name, then check the protection and the route to your spending account. A similar yield or a check-writing feature does not make these products equivalent. This guide covers U.S. accounts and funds; it does not quote current rates or recommend a provider.

Money market account vs money market fund at a glance

Question	Money market deposit account	Money market mutual fund
What do you hold?	A deposit at a bank or credit union	Shares in a mutual fund
How do you earn income?	Interest under the account's terms	Distributions from the fund's short-term investments
What protection applies?	FDIC at an insured bank; NCUA coverage at a federally insured credit union, within limits	No FDIC coverage; SIPC may protect custody at a member brokerage, within limits
Can the investment value fall?	Deposit insurance covers eligible balances within limits if the institution fails	Yes; a stable share-price target is not a guarantee
How do you access it?	Withdrawals or transfers under the institution's rules	Share redemption or a brokerage cash feature, followed by any needed transfer
What rate might you see?	APY	Seven-day yield, with an as-of date

The CFPB explains the deposit-account and mutual-fund distinction. Read the account disclosure or fund prospectus rather than relying on the words “money market” in an app menu.

Are money market funds FDIC insured?

No. A money market fund invests in short-term debt, cash, and cash equivalents. Fund managers pay distributions from that income. The SEC's money market fund bulletin explains that government, prime, and tax-exempt funds hold different types of securities and follow different rules.

Most retail and government money market funds seek a stable $1 share price. That target can fail, a loss known as “breaking the buck.” Some institutional funds use a floating share price. The SEC also describes liquidity fees and circumstances in which a fund may suspend redemptions to liquidate. Check the specific fund's prospectus for risks and redemption terms.

A government fund's holdings do not turn its shares into an insured bank deposit. Nor does buying a fund through a bank give it FDIC coverage.

FDIC vs SIPC: what each protection covers

The FDIC's standard coverage is $250,000 per depositor, per insured bank, for each ownership category. It combines deposits in the same category at the same bank, including different account products. The FDIC's coverage guide lists eligible deposits and ownership categories.

Suppose you have a hypothetical $180,000 savings account and a $90,000 money market deposit account. Both belong to you alone, without named beneficiaries, at the same insured bank. The combined single-account balance is $270,000. The standard $250,000 limit leaves $20,000 above coverage, before considering accrued interest. Opening a second account did not create a second coverage limit. Different ownership categories have their own requirements.

SIPC works on a different problem: restoring missing customer cash and securities during the liquidation of a failed member brokerage. SIPC states a $500,000 protection limit, including a $250,000 limit for cash. It treats money market mutual funds as securities, rather than cash, for this purpose. The limits do not create separate protection for each fund you own.

If a fund's value falls, SIPC does not make up that decline. Verify brokerage membership and the account's coverage details; the phrase “SIPC protected” does not promise a stable investment value.

Identify what your brokerage does with uninvested cash

A brokerage can display several different products under “cash.” The SEC's cash-sweep bulletin describes three common arrangements:

A bank sweep moves cash to deposit accounts at participating banks. FDIC limits apply at each insured bank, taking account of other deposits you hold there in the same ownership category.
A money market fund sweep invests the cash in fund shares. Those shares have no FDIC coverage.
A free credit balance leaves cash at the brokerage. The firm may pay interest or none; eligible brokerage cash may receive SIPC protection.

Look at your statement and sweep agreement. Record the fund name or receiving bank, rate, fees, and available withdrawal features. A cash-management account's brand name or debit card does not identify the underlying product.

Compare access before comparing yield

For a bill due on Monday, the useful question is when money can reach the account that pays it. A money market deposit account may offer checks or a debit card, but the institution can impose minimum balances, fees, or transaction limits. External transfers can add another step.

For a fund, check the redemption cutoff, when proceeds become available, whether the brokerage sells eligible fund shares to cover payments, and how long an external bank transfer takes. Do not assume a check-writing feature gives every fund the same access schedule. Ask how weekends, holidays, deposit holds, and large withdrawals affect the route.

This access question adds detail to emergency fund vs. investing. That guide explains the purpose of a reserve; the account agreement tells you whether you can reach this particular balance when a bill arrives.

Seven-day yield vs APY: read the date and definition

A bank's APY includes compounding under its disclosed assumptions. Our APY vs. interest rate guide shows the arithmetic. A variable deposit rate can change after you open the account.

A fund's seven-day yield annualizes income from a recent seven-day period. For example, Fidelity defines its quoted fund yield as income after expenses over the past seven days, annualized. Read the provider's yield definition, including whether it assumes reinvestment.

A hypothetical 4% seven-day yield does not mean you earned 4% in one week or will earn 4% over the next year. It describes the recent income rate on an annual scale. Record the as-of date, expense treatment, and any fee waivers before comparing it with an APY. Neither percentage alone tells you the dollar income on a balance that changes during the year.

Keep cash outside the stock-replay denominator

A cash balance matters when you evaluate a portfolio over time. Suppose you set aside $8,000 in cash and examine $12,000 in stocks. The stock portion represents 60% of the combined $20,000, with cash at 40%.

If you enter only those stocks in Equity Replay, their weights must total 100% of the stock portion. You cannot treat that chart as the result for the combined cash-and-stock balance.

Consider a hypothetical 25% decline in the stock portion. The $12,000 becomes $9,000. If cash stays at $8,000, the combined balance becomes $17,000, a 15% decline. This arithmetic assumes no cash interest, fund distributions, fees, taxes, or transfers. It illustrates the denominator; it does not recommend a cash allocation or model an account.

Use Build a portfolio to inspect a defined stock or ETF mix across available historical closing prices. Equity Replay applies weights once at the start and excludes cash-account interest, dividends, fees, taxes, deposits, withdrawals, and rebalancing. A flat price line cannot reproduce a money market fund's income distributions. Read price return vs. total return before comparing an income-paying fund with a price-only chart.

Equity Replay is an educational historical simulator, not investment advice, a bank, a broker, or a record of trades. It cannot verify deposit coverage, reproduce a brokerage cash sweep, or tell you which cash product to choose. The replay methodology explains the calculation's scope.