Should I Keep Cash in MMF or Savings? (2026 Decision Guide)
Quick take: If your cash already lives in a brokerage account, use the brokerage MMF — no friction, full daily liquidity, 4%+ yield. If your cash lives in a checking account at a major bank, open a HYSA for the savings sleeve and skip the brokerage. If you have $100K+ that won't move for 3+ years, you're asking the wrong question — that money belongs in a locked CD or MYGA, not in cash at all.
The 30-second decision tree
| Your situation | Right answer |
|---|---|
| Cash in Vanguard/Fidelity/Schwab brokerage already | Brokerage MMF (VMFXX, SPAXX, FDLXX, SNSXX) |
| Cash in Chase/BofA/Wells Fargo checking | HYSA at Ally, Marcus, or similar |
| $250K+ in one place, want FDIC | HYSA (FDIC-insured), or split across multiple banks |
| Live in CA/NY/NJ, want maximum after-tax yield | Treasury MMF (VUSXX, FDLXX, SNSXX) |
| $100K+ won't need for 3-5 years | 3-5 year MYGA, not cash at all |
| Mix of all of the above | HYSA for emergency fund + brokerage MMF for the rest of cash + MYGA for the multi-year slug |
MMF wins when
- You already have a brokerage account — zero-friction to buy and sell.
- You live in a high-state-tax state and pick a Treasury MMF — state-tax exemption beats every HYSA after tax.
- The Fed is hiking — MMF yields catch up faster than HYSA APYs.
- You want same-day liquidity for trading or other brokerage activity.
HYSA wins when
- You want FDIC insurance with categorical zero risk.
- You don't have a brokerage account.
- The Fed is cutting — banks lag HYSA APY cuts (you keep earning the old rate for weeks).
- You want a hard physical separation between checking and savings for budgeting discipline.
Neither wins when — the 3-year rule
If you have $100K+ that won't move for 3 years or more, neither a MMF nor a HYSA is the right vehicle. Both will lose 100+ bps of yield over the holding period vs a locked rate.
The right vehicle for 3-7 year money in 2026:
- 3-5 year CD — 4.50-4.75% APY locked, FDIC-insured to $250K
- 3-5 year MYGA — 5.40-5.60% locked, state guaranty fund to $250-300K, tax-deferred
- Treasury bond ladder — 4.10-4.40% locked, state-tax-exempt, full federal-backed safety
For age 59½+ buyers, the MYGA usually wins the after-tax math by a wide margin. See worked $250K math →
The portfolio approach — what most retirees actually do
Most retirees with cash holdings use a layered approach:
- Layer 1 — checking buffer: 1-2 months expenses in checking. Zero yield. Maximum accessibility.
- Layer 2 — emergency fund: 3-6 months expenses in HYSA. ~4% APY. FDIC. 1-3 day access.
- Layer 3 — brokerage cash: Brokerage MMF for cash awaiting investment, dividend reinvestment overflow, etc. ~4% yield. Same-day brokerage liquidity.
- Layer 4 — medium-term locked: 1-3 year CD/MYGA ladder for money targeted at near-term goals.
- Layer 5 — long-term locked: 5-7 year MYGA or annuity bucket for the income-generating piece of the portfolio.
This layering is the right architecture. The mistake most retirees make: too much in Layer 1-3 (cash) and not enough in Layer 4-5 (locked rate). When the Fed cuts, the over-cash retiree loses 100-200 bps of yield on the over-allocated portion for years.
More Money Market Fund research
- Best Money Market Funds 2026 (ranked)
- MMF vs MYGA — when each wins
- MMF vs HYSA — yield spread and risk
- MMF vs CD — liquidity vs lock
- Breaking the buck — 1994 & 2008 cases
- How MMF yields track the Fed funds rate
- High-Yield Savings reviews
- Best MYGA rates 2026
FAQ
Q: How much cash should a retiree hold?
A: A common rule of thumb: 1-2 years of expenses in cash + short-term reserves. More than that is typically over-allocated to cash and under-allocated to locked rates / income vehicles. Less is fine for retirees with reliable Social Security and pension income covering monthly expenses.
Q: Is a brokered CD different from a HYSA?
A: Yes. A brokered CD is purchased inside a brokerage account from an issuing bank; FDIC-insured by that bank. A HYSA is a direct deposit account at a bank. Both are FDIC-insured. Brokered CDs typically have higher yields but are harder to redeem early (sold on the secondary market at market prices — can be at a loss if rates have risen).
Q: What about ultra-high-yield "promo" HYSAs at small banks?
A: Often legit, but: (1) check the bank's BauerFinancial rating; (2) read the fine print on the promo rate (some convert to 0.50% after 6 months); (3) check the maximum balance the promo rate applies to (some cap at $25K).
Q: Can I have too much cash?
A: Yes — very common. The "safe" 5% cash yield in 2026 is locking you out of the locked 5.5% MYGA yield that compounds tax-deferred. If you hold $500K in cash for 5 years vs $500K in a 5-year MYGA, you lose ~$100K of growth (post-tax) you could have had. Cash drag is real.
About Hans Goldstein: Independent retirement income specialist. CA Life License #4163961. NPN #20602398. Reviews 30+ carriers and the full menu of cash alternatives. Phone: 213-414-2808. Email: hans@goldsteinco.net.
Hans is independently licensed as an insurance producer; he does not sell money market funds or other securities. These reviews are based on publicly available fund prospectuses, fact sheets, SEC filings, and SEC-yield reporting requirements.
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Money market funds are great for short-term cash. For money you don't need for 3+ years, a multi-year guaranteed annuity (MYGA) typically pays 100-150 bps more and defers tax. Get an independent side-by-side before you let cash drift in a MMF for 5 years.
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Disclosure
This review reflects publicly available fund prospectuses, fact sheets, and approximate 7-day SEC yields as of the date stated above. Money market fund yields change daily and reset roughly in line with the federal funds rate; always confirm current yield, expense ratio, holdings, and weighted average maturity against the most recent fund disclosure document before committing capital. Money market funds are not FDIC-insured. Government and Treasury money market funds historically maintain a stable $1.00 NAV but are not guaranteed to do so — see "breaking the buck" history. Prime money market funds may impose liquidity fees or redemption gates during market stress. This article is general information for educational purposes; it is not a personalized recommendation, solicitation, or offer of any specific product. Hans Goldstein is an independent licensed insurance producer (NPN 20602398) and does not sell securities or money market funds; comparisons to multi-year guaranteed annuities (MYGAs) are provided for informational context only. No compensation has been received from any fund company in connection with the publication of this review. Always read the actual fund prospectus and consult a licensed advisor before investing. Past yield does not predict future yield. State income tax treatment of U.S. Treasury obligations varies and is subject to change. Tax discussion reflects federal and California law as of 2026 and is subject to change.