HYSA vs. CD vs. Money Market: Where to Keep Your Cash

Where you keep cash should depend on one thing above all: when you'll need it. The right home for an emergency fund is the wrong home for money you won't touch for three years — and both beat leaving it in a big-bank savings account earning almost nothing. This guide compares the four main places to park cash and shows how to match each to a goal.

The four main homes for cash

Each trades some mix of yield, access, and simplicity. None is 'best' — they're built for different jobs:

• High-yield savings (HYSA): online-bank savings paying near the top of the market, fully liquid, FDIC-insured. The default home for an emergency fund or a near-term goal.
• Certificate of deposit (CD): locks a fixed rate for a set term — three months to five years — in exchange for an early-withdrawal penalty. Best for a lump sum with a known date.
• Money market account (MMA): a savings/checking hybrid with a competitive yield and limited check-writing, also FDIC-insured. Handy for larger balances you dip into occasionally.
• Checking and Treasury bills: checking holds spending cash (little to no yield); short-term Treasurys pay a competitive, state-tax-free yield on larger sums, backed by the U.S. government.

The core tradeoff: liquidity vs. yield

As a rule, the more you're willing to lock money up, the more you get paid for it. A HYSA stays fully liquid, so its rate floats with the market. A CD pays you to commit for a fixed term — but pulling out early forfeits some interest. The mistake to avoid is chasing a slightly higher CD rate with money you might actually need, then paying a penalty to get it back.

Safety: is your cash insured?

At banks, deposits are FDIC-insured to $250,000 per depositor, per institution; at credit unions, NCUA provides the same. That covers HYSAs, CDs, and money market accounts. One critical distinction: a money market *account* (a bank deposit) is insured, but a money market *fund* (a brokerage investment) is not FDIC-insured — it's very low risk, but a different thing. Treasury bills carry the full backing of the U.S. government.

Which to use, by goal

• Emergency fund (3–6 months of expenses): HYSA or MMA — it has to be instant and safe, not high-yield.
• Money you'll spend within a year (a wedding, a tax bill): HYSA, or a short CD if the date is fixed and you won't touch it.
• A lump sum you won't need for one to five years: a CD ladder locks in rates across several terms without giving up all access at once.
• Long-term money (5+ years): none of these — that's what investing is for, where growth outpaces cash yields over time.

The tax detail that changes the ranking

Interest is taxed as ordinary income, at your marginal rate, in the year it is earned — there is no favourable treatment as there is for long-term capital gains. On a 4.25% account, a saver in the 24% federal bracket keeps about 3.23%.

Treasury bills are the exception worth knowing: their interest is exempt from state and local income tax, though not federal. In a high-tax state that exemption can be worth more than the difference in headline yield between a T-bill and a savings account, which is why comparing the two on advertised rates alone gets the answer wrong. In a state with no income tax it is worth nothing at all.

None of this applies inside a tax-advantaged account, where interest accrues untaxed — so if you hold cash within an IRA, choose purely on yield and access.

How a CD ladder works

A ladder solves the CD's main drawback — that committing everything to one term means none of it is available until that term ends. Split the money into equal parts across staggered maturities, so something matures regularly and the rest keeps earning the longer rate.

Divide $20,000 into five $4,000 rungs at one, two, three, four and five years. From year one onwards a rung matures every year, and each maturing rung is either spent or rolled into a new five-year CD. After the fifth year every rung earns the five-year rate while a fifth of the money remains reachable annually — long-term yield with annual access, which is the whole point.

The shape follows the goal. A house deposit two years out wants short rungs; money with no fixed date can ladder further out.

Do not leave the yield on the table

The gap between a large bank's default savings rate and a competitive one is routinely tenfold or more. On $20,000, the difference between 0.40% and 4.25% is $80 a year against $850 — about $770 for one transfer that takes an afternoon.

Two habits keep it. Compare on APY rather than the quoted interest rate, since APY includes the effect of compounding and is the only figure that compares like with like — the distinction is explained in APR vs APY. And re-check once a year: these rates are variable, they follow the Federal Reserve, and the introductory rate that won your business is not always the one you are still receiving.

Run your own number

See what a balance earns at different rates and compounding frequencies in the savings calculator, compare fixed terms in the CD calculator, and build the rungs in the CD ladder calculator. If the money is your safety net rather than a goal, size it first in the emergency fund calculator.