All three are FDIC-insured deposit accounts that currently pay 4-5% APY [verify against May 2026 rates]. The differences are in liquidity (how easily you can get your money out) and rate certainty (whether the rate is locked in or variable).
Quick comparison
| High-Yield Savings | Money Market | Certificate of Deposit | |
|---|---|---|---|
| Typical APY (May 2026) | 4.20–4.50% | 4.00–4.50% | 4.50–5.25% |
| Rate type | Variable | Variable | Fixed for term |
| Access to funds | Anytime, ACH | Anytime, often check/debit | Locked until maturity |
| Early withdrawal penalty | None | None | Yes — typically 3-12 months interest |
| Minimum balance | Usually $0 | Often $2,500–$10,000 | Often $500–$1,000 |
| FDIC insured | Yes | Yes | Yes |
| Good for | Emergency fund, short-term goals | Same as HYSA, but with check-writing | Money you won't need for 6 months to 5 years |
High-Yield Savings (HYSA)
The simplest of the three. Variable rate, no commitment, full liquidity. Detailed in our HYSA guide.
Best for: Emergency funds, money you might need within a year, savers who want maximum flexibility.
Watch out for: Rate changes. If you opened at 4.5% APY and the Fed cuts rates, your APY drops too — sometimes within weeks.
Money Market Account (MMA)
Functionally similar to a HYSA but with extra features:
- Often comes with a debit card or checks
- Higher minimum balance to earn the top APY (often $2,500-$10,000)
- Sometimes pays a slightly higher rate at the highest tiers
- Same FDIC insurance, same variable rate exposure
The line between MMAs and HYSAs has blurred over the years. Many "money market accounts" today are basically HYSAs with check-writing, and many "high-yield savings accounts" pay competitive rates without requiring a minimum. The names are mostly marketing.
Best for: Savers who want a big balance to earn a competitive rate AND want to occasionally write checks against it (e.g., a self-employed person paying quarterly estimated taxes).
Watch out for: Tiered rates. Some MMAs only pay the headline rate on balances above $25,000 or $100,000 — below that, the rate drops to barely-better-than-checking levels.
Certificate of Deposit (CD)
A CD is a deposit you commit for a fixed term — anywhere from 3 months to 5+ years. In exchange for the commitment, the bank guarantees the rate.
The lock-in is the main feature. A 1-year CD opened in May 2026 at 5.00% APY pays 5.00% for the full year, even if the Fed cuts rates 1% in July. If you have a HYSA at 4.50% that drops to 3.50% in July, the CD wins.
The lock-in is also the main drawback. If you need the money before maturity, you pay an early withdrawal penalty — typically 3 months of interest for short-term CDs, 6-12 months for longer terms. On a 1-year CD with 3 months penalty, withdrawing in month 5 means losing all the interest you earned plus some principal.
No-penalty CDs exist (Marcus, Ally, and others offer them). They typically pay slightly less than regular CDs but let you withdraw without penalty after the first 6-7 days. They're effectively HYSAs with a rate guarantee.
CD ladders are a strategy where you split money across CDs of different terms (1-year, 2-year, 3-year, etc.) so one CD matures every year. As each one matures, you get the cash plus the option to renew at then-current rates. This blends some liquidity with rate-locking.
Best for: Money you definitely won't need until a specific date — saving for a down payment 2 years out, an income gap during a sabbatical, etc.
Watch out for: Locking in a long-term CD just before rates rise. If you put $50,000 in a 5-year CD at 4% and rates jump to 7%, you're stuck with 4% for years.
How to choose
Match the product to the time horizon for your goal:
- 0-12 months (emergency fund, near-term spending) → HYSA. Liquidity matters more than rate.
- 1-5 years (down payment, planned car purchase, wedding) → CD ladder, or a CD matched to your timeline.
- Variable timeline, large balance (high-net-worth cash reserve) → MMA with check-writing, or split between HYSA and short-term CDs.
- 5+ years → consider stocks/bonds, not deposit products. The historical stock market real return (~7%) substantially exceeds even the best deposit rates over long horizons.
The biggest mistake is using a CD for emergency funds. The whole point of an emergency fund is access; locking it up defeats the purpose. The second-biggest mistake is using a HYSA for long-term goals — the variable rate exposes you to a multi-decade compounding shortfall.
What about Treasury bills and money market funds?
Worth knowing: Treasury bills (T-bills) and money market mutual funds are different products that often pay similar rates to HYSAs/CDs but have different rules:
- T-bills are direct purchases of US government debt through TreasuryDirect.gov. They're not FDIC-insured (but are backed by the full faith and credit of the US government, which is functionally the same level of safety). Interest is exempt from state income tax — meaningful in high-tax states.
- Money market mutual funds (different from money market accounts) are investment products, not deposit products. Not FDIC-insured. Returns can fluctuate, though "stable NAV" funds historically maintain $1/share. Often available through brokerage accounts.
For straightforward savings, FDIC-insured deposit accounts (HYSA, MMA, CD) are the simplest and safest. T-bills and money market funds add complexity in exchange for tax efficiency or marginal yield gains, and are most useful for larger balances.
To project specific scenarios across these products, use our APY calculator.