Money market accounts and certificates of deposit both offer a step up from a basic savings rate, but they trade flexibility for yield in opposite ways. Choosing between them comes down to whether you need ongoing access to the funds or can commit to leaving them untouched for a fixed term.
The core tradeoff
A money market account keeps your funds liquid, with the same kind of access as a savings account — transfers, sometimes check-writing — while typically earning a rate close to or competitive with a high-yield savings account. A CD locks your funds for a fixed term in exchange for a rate that's often, though not always, higher than what a fully liquid account offers at the same point in time.
CD rates don't move once your money is locked in, even if market rates rise during the term — this works in your favor if rates fall after you lock in, but against you if rates rise and you're stuck at the older, lower rate.
When a money market account fits better
If there's any real chance you'll need the funds before a fixed date, or if you simply value not having to think about a maturity deadline, a money market account's liquidity is worth more than a CD's typically modest rate premium. This is especially true when CD and money market rates are close to each other, which narrows the incentive to lock funds away at all.
When a CD fits better
If you have a specific savings goal with a known date — funds you won't need until a known future point, like a home down payment 18 months out — a CD with a matching term can lock in a known return with certainty, removing any worry about rate fluctuations between now and when you need the money.
- Compare current money market and CD rates directly, since the gap between them varies over time
- Match any CD term length to a genuine, known timeline for when you'll need the funds
- Choose a money market account by default if there's meaningful uncertainty about when you might need access
- Consider splitting funds between both if you have some money with a known timeline and some that needs to stay flexible
Frequently asked questions
Is a CD ever a poor choice even with a known timeline?
If the rate difference between a CD and a fully liquid account is minimal, the added restriction of a CD may not be worth it for a marginal rate gain — it's worth checking actual current rates rather than assuming a CD automatically pays more.
Can I have both a money market account and CDs at the same time?
Yes, and this is a common approach — using a money market account for funds you might need on short notice, while placing money with a known future use into one or more CDs.