How a Money Market Account Works
A money market account is a deposit account, not an investment. When you open one at a bank or credit union, your money earns interest at a rate the institution sets, and your balance grows over time through compounding. The key features that distinguish MMAs from standard savings accounts are the higher typical interest rate, the higher minimum balance requirement, and the limited access to funds through checks or a debit card.
Most banks and credit unions pay tiered rates on money market accounts — meaning the more you deposit, the higher the rate you earn. This is different from a standard savings account, which typically applies a single rate to any balance. You can see how current rates compare across hundreds of institutions on our money market rate tables, updated daily.
Your money in an MMA is not locked up. There is no fixed term and no penalty for withdrawals, unlike a certificate of deposit. However, most institutions limit the number of convenient transfers or withdrawals you can make per month — more on that below.
FDIC and NCUA Insurance: Your Money Is Protected
Money market accounts at banks are insured by the Federal Deposit Insurance Corporation (FDIC) up to $250,000 per depositor, per insured bank, per account ownership category. At credit unions, the equivalent protection is provided by the National Credit Union Administration (NCUA) through the National Credit Union Share Insurance Fund. The coverage limits and structure are identical — $250,000 per member, per insured credit union, per ownership category.
Account ownership categories matter for maximizing coverage. Individual accounts, joint accounts, retirement accounts (IRAs), and certain trust accounts are each counted separately. A married couple, for example, can protect $500,000 at a single bank — $250,000 each in individual accounts — and more if they also hold joint accounts.
What Federal Insurance Does Not Cover: FDIC and NCUA deposit insurance applies only to deposit accounts — checking, savings, money market deposit accounts, and CDs. It does not cover money market mutual funds, stocks, bonds, or annuities, even if purchased through a bank or credit union. If your institution offers investment products alongside deposit accounts, those investments are held separately and are not insured.
Money Market Account vs. Money Market Mutual Fund
The names are confusingly similar, but these are fundamentally different products. A money market account is a bank or credit union deposit account insured by the federal government. A money market mutual fund is an investment product sold by brokerage firms that is regulated by the SEC under the Investment Company Act of 1940.
| Feature | Money Market Account | Money Market Mutual Fund |
|---|---|---|
| Where offered | Banks & credit unions | Brokerage firms & fund companies |
| Federal insurance | FDIC / NCUA up to $250,000 | Not insured (SIPC coverage for brokerage failure only) |
| Risk level | No investment risk | Subject to market risk (though typically low) |
| Regulation | Banking regulators (FDIC, NCUA) | SEC & Investment Company Act |
| Check writing | Sometimes available | Sometimes available |
| Best for | Safe cash storage | Yield-seeking investors comfortable with minimal risk |
For most consumers focused on keeping cash safe while earning a competitive return, the money market deposit account at a bank or credit union is the right choice. The federal insurance removes the risk that mutual funds carry, even if that risk is small.
Minimum Balance Requirements
Most money market accounts require a minimum balance to open the account and, in many cases, a minimum balance to earn the advertised rate or avoid monthly fees. These minimums are higher than what standard savings accounts require:
- Opening minimum: Commonly $1,000 to $2,500, though some online banks offer MMAs with no minimum or lower thresholds
- Rate-qualifying minimum: Some institutions require $10,000 or more to earn the top advertised rate; lower balances earn a reduced rate
- Fee-waiver minimum: Monthly maintenance fees (typically $10 to $25) are often waived by maintaining a minimum daily balance
- Jumbo tier: Some institutions offer premium rates on balances above $100,000 — these are called jumbo money market accounts
Always confirm both the opening minimum and the ongoing minimum required to earn the rate you see advertised. These are sometimes different numbers.
Accessing Your Money: Withdrawals and Limits
Money market accounts offer more access to your money than a CD but less than a checking account. The key distinction is between convenient and non-convenient withdrawals:
- Unlimited withdrawals: In person at a branch, by ATM, by mail, or by telephone
- Limited withdrawals (historically): Transfers, online payments, debit card purchases, and similar transactions were historically capped at six per month under Federal Reserve Regulation D
In April 2020, the Federal Reserve amended Regulation D to remove the six-per-month limit as a regulatory requirement. However, many banks and credit unions continue to enforce their own transaction limits and may charge fees or convert your account if you exceed them. Check your account's terms before assuming the limit no longer applies to you.
Fee Trap to Watch For: Exceeding an institution's monthly withdrawal limit can trigger per-transaction fees of $5 to $15 each, or the bank may automatically convert your money market account to a checking account that pays little or no interest. Monitor your transaction count if your institution still enforces a limit.
What Kind of Rates Can You Expect?
Money market account rates vary significantly between institutions. Large national brick-and-mortar banks typically offer rates near the national average, which can lag far behind what online banks and credit unions pay. The spread between the highest and lowest MMA rates at any given time can be 2% APY or more.
Online banks consistently lead the rate rankings because they operate without a physical branch network. Those cost savings are passed to depositors as higher rates. High-yield money market accounts at online banks and credit unions are where the most competitive rates are found.
Rates on money market accounts are variable, not fixed — the institution can change your rate at any time. If you want a guaranteed rate for a fixed period, a CD is the appropriate alternative. For money you need to keep liquid while still earning a competitive return, an MMA is generally the better fit.
Who Should Use a Money Market Account?
A money market account is a good fit when you have a larger balance of cash that you want to keep safe and accessible while earning more than a standard savings account would pay. Common use cases:
- Emergency fund: If you have 3 to 6 months of expenses saved, an MMA lets that money earn a competitive rate while staying accessible without penalty
- Large short-term savings: Saving for a home down payment, a business expense, or another near-term goal where the money needs to be liquid
- Business operating reserves: Businesses with fluctuating cash flow benefit from MMAs — see business money market accounts for business-specific options
- Higher-balance savers: If you consistently maintain a balance above $10,000, the tiered rates on an MMA may substantially outperform a standard savings account
If your balance is typically below the minimum threshold, a high-yield savings account may offer similar or better rates without the minimum balance pressure. If your balance is large and stable, a CD ladder can offer higher rates than either, at the cost of liquidity.
