HYSA vs CD vs Money Market: Compared
High-yield savings accounts offer top-tier variable rates with full liquidity. Certificates of deposit lock a fixed rate for a set term, paying slightly more when rates are expected to fall, but charge penalties for early withdrawal. Money market accounts blend savings yields with check-writing and debit access. Match the account to the cash: emergency funds belong in a HYSA, dated goals fit CDs, and frequently accessed cash suits money market accounts.
Cash has three premium parking spots: the high-yield savings account, the certificate of deposit, and the money market account. They look similar on a rate table and behave very differently in practice. Here is how to choose.
High-yield savings: maximum flexibility
The HYSA pays a competitive variable rate, recently around 4% or more at online banks, with no lock-up and no withdrawal penalties. You can move money in and out freely, which makes it the default home for emergency funds and savings goals with uncertain timing. The trade-off is the variable rate: if the Federal Reserve cuts, your APY falls. For money you might need any Tuesday, that trade is worth it.
CDs: a fixed rate for a fixed term
A certificate of deposit locks your money for a set term, from months to years, at a fixed rate. In exchange for illiquidity, CDs sometimes pay slightly more than HYSAs, and the lock becomes valuable when rates are falling: your 4.75% keeps paying while HYSA rates slide. The cost is the early-withdrawal penalty, typically several months of interest, which makes CDs wrong for emergency money. Use CDs for dated goals: a house down payment in 18 months, tuition due next fall.
Money market accounts: the hybrid
Money market accounts are FDIC-insured deposit accounts, not to be confused with money market mutual funds, that combine savings-like yields with transaction features: check-writing and debit cards. Rates run close to HYSA levels. They suit cash you tap regularly but want to keep earning, such as a holding account for quarterly tax payments or a large purchase fund you draw down over months.
Head-to-head on what matters
On rates, all three are competitive and the leader rotates; compare current published APYs. On liquidity, HYSA and money market win outright, with CDs last by design. On rate certainty, CDs win, since the rate is contractual. On minimums, HYSAs usually have none, while CDs and money market accounts sometimes require $500 to $2,500. On insurance, all three carry identical FDIC coverage up to $250,000 per depositor per bank per ownership category. On taxes, all three pay interest taxed as ordinary income.
The CD ladder: getting both
Borrowers who want CD rates without CD rigidity build a ladder: split the cash across 3-, 6-, 9-, and 12-month CDs, and as each matures, roll it into a new 12-month CD. After a year, a CD matures every three months, giving near-HYSA liquidity with CD pricing. Ladders take a little setup and shine for cash with a one-to-three-year horizon.
A decision framework
Ask two questions about each dollar. When might I need it? If the answer is anytime, use a HYSA. If the answer is a known date, use a CD matching that date. How much does the rate matter versus access? Emergency reserves prioritize access; goal-dated cash prioritizes the locked rate. Most households end up with both: a HYSA for the emergency fund and life's surprises, plus CDs or a ladder for the goals with dates attached.
Treasury bills: the fourth option
For cash with a known horizon, Treasury bills deserve a seat at the table. T-bills are short-term government debt, sold at a discount and maturing at face value in 4 to 52 weeks, with yields that closely track the Fed funds rate and state-tax exemption on the interest, a real edge in high-tax states. You can buy them directly at TreasuryDirect or through a brokerage, and they are backed by the full faith of the US government. The trade-offs: slightly more complexity than a bank account, and selling before maturity can mean accepting market price. For a six-month house fund in a high-tax state, T-bills often beat every bank product on an after-tax basis.
Taxes across the three
All three bank products pay interest taxed as ordinary income, federally and in most states, with 1099-INT reporting at $10 or more. CDs add a wrinkle: you owe tax on the interest in the year it is credited, even if the CD has not matured and you cannot touch it. Money market accounts work exactly like HYSAs for tax purposes. None of the three offers a tax advantage over the others, which simplifies the choice: compare on rate, liquidity, and fit, and handle the taxes identically. Treasury bills, by contrast, escape state income tax, which is part of their appeal.
No-penalty CDs: the hybrid worth knowing
No-penalty CDs split the difference between HYSAs and standard CDs: a fixed rate for a set term with one penalty-free withdrawal allowed. Rates run slightly below standard CDs but above most HYSAs, and the withdrawal option removes the liquidity fear. They suit savers who want to lock today's rate while keeping an escape hatch, particularly when rates are expected to fall. The fine print matters: the penalty-free withdrawal is usually all-or-nothing on the full balance, and the rate is fixed only until you withdraw. For the right saver, it is the best of both structures.
Emergency fund placement: the final answer
For the emergency fund specifically, the hierarchy is clear. A high-yield savings account wins for the core three to six months of expenses: full liquidity, competitive yield, no penalties. A no-penalty CD can hold the overflow beyond six months, locking a slightly better rate with an escape hatch. Standard CDs have no place in emergency money, since the penalty for early withdrawal defeats the purpose of reserves. Keep the emergency fund boring, liquid, and insured; optimize the yield on the margins, not at the cost of access.
Data current as of October 2026. Rate ranges are an illustrative snapshot; banks change rates frequently, so verify the current APY on each bank's site. FDIC coverage per fdic.gov.