A money market account (MMA) is a deposit account—usually at a bank or credit union—that pays interest like savings while sometimes offering limited check-writing or debit access. It is not a money market mutual fund at a brokerage. Deposit MMAs can carry FDIC or NCUA insurance; brokerage funds generally do not insure market value the same way.
MMA vs HYSA vs checking
| Feature | Checking | HYSA | Bank/CU money market account |
|---|---|---|---|
| Best for | Daily spending | Emergency fund, sinking goals | Higher balances wanting savings yield + occasional checks |
| Typical APY | Low / 0% | Competitive variable | Often competitive variable; may tier by balance |
| Access | Unlimited debit/ACH | Transfers; limited checks | Often limited check/debit plus transfers |
| Fees | Watch monthly & overdraft (Checking account fees) | Usually low if you meet rules | Watch minimum-balance fees |
| Insurance | FDIC/NCUA if deposit | FDIC/NCUA if deposit | FDIC/NCUA if deposit |
Online high-yield savings accounts from Ally, Capital One 360, Discover, and many credit unions often match or beat branch MMA yields with simpler rules. How to pick among those HYSAs: Choosing a high-yield savings account. An MMA earns its keep when your bank’s MMA APY + access features beat the HYSA you would otherwise use—or when a relationship package waives fees you already pay. Full chooser: HYSA vs money market account.
What “money market” confuses people
- Money market deposit account — bank/credit union product; insured deposit when structured that way.
- Money market mutual fund / money market fund — investment product; aims at stability but is not the same as FDIC insurance on a deposit account. Read the prospectus. Full side-by-side: Money market funds vs accounts.
- Brokerage cash sweep — may land in deposit networks or funds; trace where cash sits overnight.
If the goal is emergency cash, start with insured liquid deposits (Emergency fund basics), not fund share-price assumptions.
Worked example
Riley has $18,000 emergency + near-term tax money.
| Home | APY (illust.) | Access | Fee risk |
|---|---|---|---|
| Branch MMA, $10k minimum for top rate | 3.90% | 6 checks/mo | $12/mo if balance dips under $10k |
| Online HYSA | 4.10% | ACH in 1–3 days | $0 |
| Checking | 0.01% | Instant debit | Overdraft if thin buffer |
Riley keeps $2,000 in checking for bills, parks $16,000 in the online HYSA, and skips the branch MMA because the minimum-balance fee and lower APY lose to the HYSA. If Riley’s credit union MMA paid 4.25% with a $0 fee above $5,000 and allowed the occasional cashier’s check for a landlord, the MMA could win.
Rates, tiers, and transaction limits
MMAs often use tiered APYs (example: 0.50% under $10,000; 3.80% at $10,000+). Fund only the tier you can maintain. Federal rules no longer impose the old six-per-month savings cap the same way, but banks may still limit convenient transfers or charge excess-activity fees—read the account agreement.
Compare APY, compounding, and minimums the same way you would an HYSA. For money you will not touch until a known date, a CD may pay more; see CDs vs high-yield savings. Short Treasury bills are another dated-cash option outside the deposit-MMA category.
Fees that erase the headline APY
- Monthly maintenance if average balance slips
- Excess transactions / paper check fees
- Incoming wire fees when you “need the money today”
- Overdraft if the MMA is wrongly used like checking
Audit statements like a checking account. If you are choosing a primary bank relationship, insurance + fees + ATM access all matter (How to choose a checking account).
Checklist
- Confirm you are opening a deposit MMA (FDIC/NCUA), not a brokerage fund, unless you intend otherwise.
- Compare APY, tiers, minimums, and fees to at least one online HYSA.
- Match access needs: pure savings vs occasional checks.
- Keep true daily spending in checking; do not float rent on MMA check holds.
- Verify insurance on the legal institution name (BankFind / NCUA Locate).
- Re-check APY quarterly—MMA and HYSA rates both move.
Educational only. Not an offer of a deposit product. APYs and fees change; read the truth-in-savings disclosure for the account you open.