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High-Yield Savings vs. Money Market vs. CDs

5 min read

When you need a safe place for cash, three options dominate: high-yield savings accounts (HYSAs), money market funds, and certificates of deposit (CDs). They all preserve principal, but they differ on liquidity, yield, insurance, and tax treatment. Choosing the wrong one can cost you real money — or worse, lock up cash you need.

High-Yield Savings Accounts (HYSA)

An FDIC-insured account at a bank or credit union that pays significantly more than a traditional savings account — currently 4–5% APY versus 0.01–0.50% at a brick-and-mortar bank.

Best for: Emergency funds, short-term savings goals (vacation, down payment within 12 months), and any cash you might need within a week.

Pros:

  • FDIC insured up to $250,000 per depositor, per bank. Your principal is protected even if the bank fails.
  • Highly liquid. Transfers to checking typically complete in one business day. Many offer same-day ACH.
  • No lockup. Your money isn't tied to a maturity date. Withdraw anytime.
  • Rate adjusts with the market. When the Fed raises rates, HYSA yields rise within weeks.

Cons:

  • Rate lags on the way down. When the Fed cuts, HYSAs drop quickly too. You can't lock in a rate.
  • Interest is fully taxable at your marginal income tax rate, both federal and state.
  • Some banks impose withdrawal limits (Reg D historically limited to 6/month; suspended since 2020 but some banks still enforce it).

Popular options: Ally Bank, SoFi, Marcus by Goldman Sachs, Capital One 360.

Money Market Funds

A type of mutual fund that invests in short-term, high-quality debt — Treasury bills, government agency debt, and sometimes commercial paper. You buy shares in the fund, typically through a brokerage.

Best for: Cash inside a brokerage account, tax-sensitive savers, and amounts above the FDIC insurance limit.

Pros:

  • Often higher yield than HYSAs because the fund passes through the full market rate minus a small expense ratio. VMFXX and SPAXX currently yield around 5%.
  • Treasury-only money market funds are state-tax-exempt. If you live in a high-tax state (CA, NY, NJ), the tax-equivalent yield can be meaningfully higher than the stated rate. A 5% Treasury money market yield in California at a 9.3% state bracket is equivalent to ~5.5% from a fully taxable HYSA.
  • No FDIC limit. Money market funds can hold millions efficiently — useful for house down payments, business cash reserves, or trust accounts.
  • Check-writing privileges are available on many brokerage money market funds.

Cons:

  • Not FDIC insured. While money market funds are extremely safe — a Treasury-only fund has never broken the buck — they are not guaranteed. The SEC requires them to hold highly liquid assets, but in theory they can lose value if the underlying securities default. A government money market fund is about as close to risk-free as anything without a government guarantee.
  • Slightly slower access. Selling fund shares and transferring to a bank account takes 1–2 business days.
  • May require a brokerage account. You can't open a money market fund at a traditional bank. You need a brokerage relationship (Fidelity, Vanguard, Schwab).

Certificates of Deposit (CDs)

A time deposit at a bank where you lock up a fixed amount of money for a fixed period (3 months to 5+ years) in exchange for a guaranteed interest rate.

Best for: Cash you definitively won't need until a known future date, and when you believe rates are peaking and want to lock in.

Pros:

  • Rate is locked. If the Fed cuts rates, your CD keeps paying the higher rate. Useful if you think rates are about to drop.
  • FDIC insured up to $250,000.
  • No surprises. The yield is guaranteed and known up front. Good for the peace-of-mind crowd.

Cons:

  • Early withdrawal penalty. Typically 3–6 months of interest for a 1-year CD, and up to 12 months for longer terms. If you need the money early, you lose yield and in rare cases even principal.
  • Illiquid during the term. Your cash is genuinely unavailable without penalty for the duration.
  • Misses rate increases. If you lock in a 4.5% 2-year CD and rates rise to 5.5% six months later, you're stuck. The bank wins.
  • Interest is fully taxable each year you earn it, even if the CD hasn't matured.

Decision Framework

Match the vehicle to the goal, not the yield.

SituationBest Choice
Emergency fundHYSA — liquidity trumps yield. You can't negotiate with a furnace repair over interest rates.
Cash in a brokerage accountMoney market fund — it's the default settlement fund at most brokerages. Use it.
Saving for a house in 9 monthsHYSA or money market fund — short time horizon means rate movements won't meaningfully compound. Focus on convenience.
Known expense in 18 months (wedding, tuition)18-month CD if you can beat HYSA rates by 0.50%+. Otherwise, HYSA for flexibility.
Taxable account, high state tax bracketTreasury money market fund — the state tax exemption is real money.
Amounts over $250,000Money market fund or split across multiple FDIC banks. Don't exceed insurance limits on a single bank.
You think rates are peakingCD laddering: split cash across 3, 6, 9, and 12-month CDs so something matures every quarter.

For most people, an HYSA for emergency savings plus a money market fund inside a brokerage account covers 95% of cash needs. CDs are the right tool for specific situations — but they're deployed intentionally, not by default.

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