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.

Don't leave yield on the table

The gap between a traditional big-bank savings account and a high-yield one is often 10× to 20×. On a $20,000 emergency fund, that can be hundreds of dollars a year for a five-minute transfer. Rates are variable and move with the Federal Reserve, so compare current APYs before you park cash — and re-check once a year.

Run the numbers

Use the savings and CD calculators below to see what a given balance earns at different APYs and terms, and how compounding adds up over the months you'll hold it. Then pick the vehicle whose access matches when you'll actually need the money.