Money Market Account vs Money Market Fund: What Is the Difference?
Choosing where to keep your cash can feel like choosing between two nearly identical products. Both money market accounts and money market funds can help you earn income on money you are not ready to spend. Both may also provide relatively easy access to your funds.
But there is one important difference: one is a bank deposit, while the other is an investment. Understanding that distinction can help you decide which option better fits your savings goals.
1. What Is a Money Market Account?
A money market account (MMA) is a deposit account offered by a bank or credit union. You deposit money, earn interest and access your balance according to the account's rules.
Some accounts offer check-writing privileges, debit card access or electronic transfers, although features vary by provider. Minimum balance requirements and withdrawal conditions may also apply.
The biggest attraction is deposit protection. At an FDIC-insured bank, eligible money market account deposits are covered by the Federal Deposit Insurance Corporation (FDIC), subject to applicable limits.
Think of it as a savings account with features that may make accessing your cash more convenient.
2. What Is a Money Market Fund?
A money market fund is a type of mutual fund that pools investors' money to purchase short-term investments, such as Treasury bills, certain government securities and short-term corporate debt.
Instead of earning interest directly on a bank deposit, you own shares in a professionally managed investment fund. The fund earns income from its underlying investments and distributes income to shareholders.
US money market funds generally fall into three categories:
- Government funds: Primarily invest in cash, government securities and related repurchase agreements.
- Prime funds: Invest in short-term debt that may include corporate and financial institution obligations.
- Tax-exempt funds: Generally invest in municipal securities whose interest may receive favourable tax treatment.
The categories have different investment exposures. Check the fund's prospectus to understand what it actually holds.
According to the SEC's Investor.gov guide, money market funds generally have relatively low risk compared with many other mutual funds, but they are not risk-free.
3. Which Is Safer? Understanding FDIC Insurance
This is where the difference really matters.
The FDIC protects eligible deposits at insured banks against bank failure, up to $250,000 per depositor, per insured bank, per ownership category. Coverage depends on how accounts are owned and other applicable rules.
Money market funds do not receive FDIC deposit insurance, even when purchased through a bank or brokerage.
Why does that matter? A money market fund can lose value if its investments experience significant losses. Some funds seek to maintain a stable $1 share price, but that price is not guaranteed. Others use a floating net asset value (NAV), which changes with the value of their holdings.
A fund that loses enough value may experience what is commonly called "breaking the buck."
For official guidance, see the FDIC's deposit insurance information and the SEC's money market fund bulletin.
4. Access, Liquidity and Fees
Both products can offer convenient access to cash, but the details matter.
| Feature | Money market account | Money market fund |
|---|---|---|
| Where you open it | Bank or credit union | Fund provider or brokerage |
| Access | Transfers, withdrawals and other account features | Redemption through the fund or brokerage |
| Deposit protection | Eligible deposits may be FDIC-insured | No FDIC deposit insurance |
| Potential costs | Account fees or minimum balance charges | Expense ratio and possible transaction or redemption charges |
| Main risks | Bank failure beyond applicable protection, inflation and changing interest rates | Investment losses, liquidity risks and changing yields |
Money market accounts may charge monthly maintenance fees or require minimum balances to avoid them. Money market funds charge operating expenses, commonly expressed as an annual expense ratio. Depending on the fund and platform, additional charges may apply.
Liquidity is not the same as immediate access. Check transfer limits, business-day processing, redemption cut-off times and settlement arrangements before committing your money.
5. APY vs Fund Yield: Do Not Compare the Numbers Blindly
A bank account's annual percentage yield (APY) reflects the interest rate and the effect of compounding over a year, assuming the stated conditions apply.
A money market fund's advertised yield may use a different calculation. For example, its seven-day yield annualises recent income after fund expenses over a seven-day period. It is a snapshot, not a promise of what the fund will earn over the next year.
Suppose a bank account advertises a 4% APY and a fund reports a 4% seven-day yield. The figures look identical, but they are not necessarily directly comparable. The account's APY incorporates compounding, while the fund's yield reflects its particular calculation method.
Fund yields can change as short-term interest rates and portfolio income change. Account rates can also change, depending on the bank's terms.
Before comparing returns, check the calculation method, fees, tax treatment and period covered. Never assume an advertised yield is guaranteed.
6. Your Money Market Comparison Checklist
Before choosing either product, ask yourself:
- Protection: Is the account held at an FDIC-insured bank, and how much of my deposit is covered?
- Access: When can I withdraw or redeem my money?
- Costs: What fees, minimum balances or transaction charges apply?
- Returns: Am I comparing APY with APY, or understanding the fund's specific yield calculation?
- Risk: Can I tolerate the possibility of investment losses?
- Purpose: Is this money for emergency expenses, short-term savings or investment cash awaiting another opportunity?
One final distinction: US money market funds are not the same as Kenyan money market funds. Kenyan products operate under the applicable Kenyan regulatory framework and have their own fees, investment rules, yields and risks. US FDIC insurance does not automatically apply to a Kenyan fund. Always consult the relevant regulator and the specific product documents.
The Bottom Line
A money market account may suit someone who prioritises an eligible, insured bank deposit. A money market fund may suit someone seeking investment income from a portfolio of short-term securities and who understands the associated risks.
Neither is automatically the better choice. Compare protection, access, costs and return calculations before deciding where your cash belongs.
