What Is a Money Market Account?
A money market account (MMA) is a hybrid between savings and checking: it pays interest like a high-yield savings account but often adds a debit card or check-writing. MMAs at banks are FDIC-insured just like savings accounts. Don't confuse them with money market funds, which are investment products held at brokerages and not FDIC-insured.
How This Money Market Interest Calculator Works
Enter your balance, the account's APY, and how long the money will sit. The calculator compounds the advertised APY over your period: Final Balance = Balance × (1 + APY)^(months ÷ 12). A $25,000 balance at 4.10% APY earns about $1,025 over 12 months, roughly $84 in the first month. Because money market rates are variable, treat the result as an estimate at today's rate rather than a guarantee — that's the fundamental difference from a CD.
MMA vs Savings vs CD
- MMA: variable rate, liquid, sometimes check access; may require a higher minimum balance for the best rate.
- High-yield savings: variable rate, liquid, usually no minimums; rates are often nearly identical to MMAs.
- CD: fixed, locked rate — usually the highest of the three, in exchange for giving up access. Compare the same deposit both ways with our CD vs savings calculator.
Understanding Money Market Rates
Money market rates follow the same market forces as savings rates: when the Federal Reserve moves its benchmark rate, MMA yields follow within weeks — in both directions. Two practical consequences: first, an attractive rate today can quietly shrink next quarter, so re-shop your account once or twice a year. Second, many MMAs use balance tiers — the headline rate may apply only above $10,000 or $25,000, with a much lower rate underneath. When comparing accounts, always check the rate at your balance, not the advertised maximum.
Getting the Most From an MMA
Use an MMA for money that needs to stay reachable but should still work: an emergency fund (size yours with the Emergency Fund Calculator), a house down payment in motion, or business cash reserves. For money with a known future date, a CD's locked rate usually wins — and for spare cash you'll hold over a year, compare a CD ladder against your MMA's floating rate.
Frequently Asked Questions
How is interest calculated on a money market account?
Banks typically calculate interest daily on your balance and credit it monthly. The APY they advertise already includes that compounding, which is why this calculator only needs your balance, APY, and time period to estimate earnings accurately.
How much does a money market account pay monthly?
Multiply your balance by (1 + APY)^(1/12) − 1. At 4.10% APY, $25,000 pays about $84 per month, $50,000 about $168, and $100,000 about $335. The calculator above shows your first-month figure automatically.
Is money market interest taxable?
Yes — MMA interest is ordinary taxable income in the year it's credited, exactly like savings account or CD interest. Your bank issues a 1099-INT if you earn more than $10.
Is a money market account the same as an MMA calculator's "money market fund"?
No. A money market account is a bank deposit with FDIC insurance. A money market fund is a brokerage investment that holds short-term debt; it's low-risk but not insured. This calculator is designed for bank money market accounts.