CD vs. Money Market Account: Comparing Safe Savings Options
- 到期时
- US$10,450.00
- 利息
- US$450.00
存期
US$10,000.00 for 1 year, compounded daily. Runs in your browser.
A money market account is not a money market fund
Money market account and money market fund sound alike and get confused constantly, but they are different products with different protections. A money market account (MMA) is a deposit account at a bank or credit union, works much like a high-yield savings account, and carries the same federal deposit insurance as a CD. A money market fund is a mutual fund that invests in short-term debt, is sold through a brokerage, and carries no FDIC or NCUA insurance — its share price is designed to stay steady but is not guaranteed to.
This guide is about the deposit account. If a product description mentions a brokerage, a prospectus, or a fund company rather than a bank, you are looking at the other one, and the comparison below does not apply to it.
How the rate behaves on each side
A CD's rate is set once, at opening, and does not move for the length of the term regardless of what happens to broader rates afterward. An MMA's rate is variable and can change at the bank's discretion, often within days of a broader shift in rates. That single difference explains almost every other difference between the two products.
When rates are falling, the CD you already hold keeps paying its original, now above-market rate, while the MMA reprices down under you. When rates are rising, the MMA catches up quickly and can pass a CD you locked in months earlier, and there is no penalty-free way to capture the increase on the CD side.
| Certificate of deposit | Money market account | |
|---|---|---|
| Rate certainty | Fixed for the whole term | Variable, and often tiered by balance |
| Access to funds | Penalty before maturity | Withdrawals allowed, sometimes limited |
| Cheques or debit card | No | Frequently included |
| Rate depends on balance | Rarely | Commonly — tiers set the rate you get |
| Insurance | FDIC or NCUA, $250,000 per category | FDIC or NCUA, $250,000 per category |
| Minimum to earn top rate | Usually just the opening minimum | Often a high tier threshold |
| Best for | A known date you will not touch it | A cash buffer you want to earn on |
What liquidity actually means in an MMA
An MMA is liquid in the sense that matters for a CD comparison: no penalty, no maturity date, and the balance is available whenever you want it. What it is not is unlimited-transaction liquid. Many money market accounts still cap the number of certain transfers or withdrawals you can make in a statement cycle, commonly around six, a limit some banks kept as their own policy even as the federal rule behind it eased over time.
- A CD gives you zero access before maturity without paying a penalty.
- An MMA typically allows a handful of withdrawals or transfers a month before extra fees or account changes apply.
- Neither is built for the several transactions a week a full checking account handles.
Minimum balances change what rate you actually earn
CD rates are usually flat across the deposit — the rate advertised is the rate you get once you clear the opening minimum. MMAs are frequently tiered instead: a stated top rate applies only above a balance threshold, and everything below it earns less, sometimes far less. A rate sheet advertising a headline APY on a money market account may mean that rate only above a specific balance, with a noticeably lower rate underneath it. Read the tier table before assuming the headline rate is yours.
Worked example: the same $10,000, two structures
Put $10,000 into a 12-month CD at 4.50% APY, compounded daily. Because APY already reflects compounding, the one-year maturity value is simply principal times (1 + APY): $10,000 × 1.045 = $10,450.00, all of it earned regardless of what rates do for the rest of the year.
Now put the same $10,000 into an MMA opening at 4.25% APY. Suppose the bank trims it to 3.75% mid-year as broader rates ease — a realistic path, not a guarantee. Averaged over the year that is close to 4.00%, which works out to roughly $400 in interest, landing near $10,400. The CD finishes about $50 ahead. That gap, small as it looks, is the price of a rate the MMA could not guarantee and the CD could.
Insurance coverage is identical
Both accounts are protected by the same federal insurance at the same limit: $250,000 per depositor, per insured bank, per ownership category, whether the money sits in a CD or an MMA. A credit union's money market share account carries the equivalent NCUA coverage. There is no safety argument for choosing one over the other — the decision is entirely about rate and access.
The decision rule
If you know when you will need the money and that date is not tomorrow, a CD's fixed rate is close to a free option — you are paid for giving up access you were not planning to use anyway. If you are not sure when you will need it, or you expect to draw on it more than a few times a month, an MMA earns most of a CD's yield while keeping the door open.
- Known deadline, money you will not touch before it: choose the CD.
- Uncertain deadline, or several withdrawals a month: choose the MMA.
- Emergency fund: MMA or high-yield savings, never a CD — the point of an emergency fund is that you cannot predict when you need it.
Running both accounts together
Most savers do not need to pick one. Keep three to six months of expenses in an MMA where it stays liquid and still earns a competitive rate, then move money with an actual deadline attached — a tax bill, a house deposit, a known expense next year — into CDs matched to that date. The MMA absorbs whatever you cannot predict; the CDs handle whatever you can.
常见问题
No. A money market account is a deposit account at a bank or credit union, insured by the FDIC or NCUA up to $250,000 per depositor, per institution, per ownership category, and it behaves much like a high-yield savings account. A money market fund is a different structure entirely: a mutual fund sold through a brokerage, holding short-term debt instruments, carrying no federal deposit insurance at all — its share price is designed to hold steady at $1.00 but is not guaranteed to. Put $10,000 into an FDIC-insured money market account at 4.00% APY for 12 months and it grows safely to $10,400.00, with the full $10,000 principal protected the entire time. Put the same $10,000 into a money market fund instead and the return depends entirely on what the fund holds, with no bank standing behind the balance if those holdings lose value. The two products share a name and a purpose, but only one of them is actually a bank deposit.
资料来源
上文所述的规则与限额均直接取自发布机构，而非二手转述。