MMAs typically offer check-writing, debit cards, and ATM access for convenient spending Money market funds are redeemed through your brokerage, usually settling in one business day Some brokerages offer check-writing on money market fund shares for added convenience Both options provide high liquidity, but MMAs offer more direct spending features Neither is designed for frequent transactions — consider a checking account for daily use

Choose an MMA when FDIC insurance and direct spending access are your top priorities Choose a money market fund when you want competitive yields within a brokerage account Government and Treasury funds add a layer of safety and potential state tax benefits Neither option is a long-term investment — both are best for cash reserves and short-term needs Review yields, fees, and minimum balances regularly as rates and offerings change

Money Market Accounts vs Money Market Funds

Curated by: Rubric Advisors

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What Is a Money Market Account?

A money market account (MMA) is a deposit account at a bank or credit union
It typically pays a higher interest rate than a regular savings account
MMAs are FDIC-insured up to $250,000 per depositor per institution
Many MMAs come with check-writing and debit card access for easy withdrawals
Rates are variable and can change at the bank's discretion at any time

What Is a Money Market Fund?

A money market fund is a mutual fund that invests in short-term, high-quality debt securities
It aims to maintain a stable net asset value (NAV) of $1.00 per share
Money market funds are not FDIC-insured but are covered by SIPC if the brokerage fails
They invest in Treasury bills, commercial paper, repurchase agreements, and similar instruments
Yields fluctuate daily based on the underlying portfolio and current short-term rates

Government vs Prime Funds

Government money market funds invest at least 99.5% in government securities and repos
Prime funds can hold corporate debt like commercial paper, typically offering slightly higher yields
Government funds are considered safer and may have fewer liquidity restrictions
Prime funds may impose liquidity fees or redemption gates during periods of market stress
Treasury-only funds offer state tax exemption on interest, a benefit for high-tax-state residents

Insurance and Safety Differences

MMAs carry FDIC insurance protecting your principal up to the coverage limit
Money market funds have no government guarantee — the $1.00 NAV is a target, not a promise
In 2008, one prominent fund "broke the buck" when its NAV fell below $1.00
SEC reforms since 2014 have strengthened money market fund liquidity requirements
For amounts above FDIC limits, spreading across institutions or using a sweep network helps

Yield and Cost Comparison

Money market funds often yield more than bank MMAs, especially at large brokerages
Banks may offer promotional MMA rates that revert to lower levels after an introductory period
Money market funds charge a small expense ratio, typically 0.10% to 0.40% annually
MMAs generally have no explicit fees but may require minimum balances to earn the top rate
Compare the net yield after fees and any minimum balance requirements before choosing

Liquidity and Access

MMAs typically offer check-writing, debit cards, and ATM access for convenient spending
Money market funds are redeemed through your brokerage, usually settling in one business day
Some brokerages offer check-writing on money market fund shares for added convenience
Both options provide high liquidity, but MMAs offer more direct spending features
Neither is designed for frequent transactions — consider a checking account for daily use

Key Takeaways

Choose an MMA when FDIC insurance and direct spending access are your top priorities
Choose a money market fund when you want competitive yields within a brokerage account
Government and Treasury funds add a layer of safety and potential state tax benefits
Neither option is a long-term investment — both are best for cash reserves and short-term needs
Review yields, fees, and minimum balances regularly as rates and offerings change

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What Is a Money Market Account?

What Is a Money Market Fund?

Government vs Prime Funds

Insurance and Safety Differences

Yield and Cost Comparison

Liquidity and Access

Key Takeaways

Related Topics

Certificates of Deposit (CDs): Safety, Rates, and Laddering

High-Yield Savings and Cash Management: Making Idle Money Work

Emergency Fund Strategies for High Earners

What Is a Money Market Account?

What Is a Money Market Fund?

Government vs Prime Funds

Insurance and Safety Differences

Yield and Cost Comparison

Liquidity and Access

Key Takeaways

Related Topics

Certificates of Deposit (CDs): Safety, Rates, and Laddering

High-Yield Savings and Cash Management: Making Idle Money Work

Emergency Fund Strategies for High Earners