Government vs Prime Money Market Funds (2026)
Quick take: Government money market funds hold U.S. Treasuries, agency paper, and Treasury-collateralized repo. Prime money market funds add commercial paper and bank CDs to pick up extra yield, 13 bps at Schwab (SWVXX 3.70% vs SNVXX 3.57%, 09/25/2026) and 0-6 bps at Fidelity (SPRXX 3.52% vs SPAXX 3.46% / FDRXX 3.52%, 09/24/2026). Prime funds can charge liquidity fees during market stress; government funds generally do not. For most retirement-age buyers, the prime yield pickup is not worth the fee risk.
| Family | Treasury | Government | Prime | Source, as of |
|---|---|---|---|---|
| Schwab | SNSXX 3.51% | SNVXX 3.57% | SWVXX 3.70% | schwabassetmanagement.com, 09/25/2026 |
| Fidelity | FDLXX 3.45% / FZFXX 3.49% | SPAXX 3.46% / FDRXX 3.52% | SPRXX 3.52% | fidelity.com, 09/24/2026 |
| Vanguard | VUSXX 3.76% (09/24) | VMFXX 3.74% (09/23) | vanguard.com |
Yields change daily. Within a fund family the prime pickup on these dates ran from 0 to 19 bps; differences in expense ratios between families were as large as the type spread.
Money market fund vs MYGA, after tax
What $100,000 earns in 5 years: money market fund vs MYGA, after tax
Rates used: Money market fund 3.76%, the highest 7-day yield we tracked (VUSXX, fund sites, September 23, 2026); yields change daily; change it to the rate you are offered. MYGA 5.95%, the best A-rated rate we track as of October 13, 2026: Delaware Life Pinnacle Plus 5-year (AM Best A-, negative outlook, 7/31/2026), $100,000 and up, effective October 6, 2026 (Delaware Life rate sheet).
| Money market fund, interest taxed every year | $115,550 |
|---|---|
| MYGA, tax-deferred, before tax | $133,507 |
| MYGA after paying tax on all the interest at withdrawal | $126,136 |
| Tax deferral alone adds about | $674 |
| MYGA ahead of the money market fund, after tax | $10,586 |
Assumes 22% federal and 0% state income tax, no withdrawals, rates held for the whole term. MYGA interest is taxed as ordinary income when you withdraw it, not as capital gains. Gains taken before age 59 1/2 can owe a 10% IRS penalty, and cashing out early can cost a surrender charge. In an IRA both grow tax-deferred, so the edge there is the rate alone. A MYGA is backed by the issuing insurer's claims-paying ability and your state's guaranty association up to its limits, not the FDIC. General education, not tax, legal or financial advice.
What's actually in a "government" MMF
- U.S. Treasury bills, notes, and bonds (direct issuance)
- U.S. government agency paper (Fannie Mae, Freddie Mac, Federal Home Loan Bank, etc.)
- Repurchase agreements collateralized by U.S. Treasuries or agency paper
SEC Rule 2a-7 requires a government MMF to hold at least 99.5% of its assets in cash, government securities, or repos fully collateralized by cash or government securities. In practice, government MMFs are tightly clustered around this profile.
What's actually in a "prime" MMF
- All of the above (government collateral)
- Commercial paper (short-term unsecured corporate debt, typically AA/A-rated issuers)
- Bank certificates of deposit and bank time deposits
- Bankers acceptances
- Short-term notes from financial institutions
A prime MMF typically holds 30-60% in commercial paper and bank obligations, with the balance in government collateral and repo.
For a real prime portfolio, see the PCOXX holdings breakdown.
Rates expire like milk.
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The yield spread, usually 0-20 bps
The prime-vs-government yield spread reflects the extra credit risk and liquidity risk in commercial paper. In normal market conditions:
| Category | 7-day yields checked Sept 23-25, 2026 | Funds checked |
|---|---|---|
| Treasury | 3.45-3.76% | FDLXX 3.45%, FZFXX 3.49%, SNSXX 3.51%, VUSXX 3.76% |
| Government | 3.46-3.74% | SPAXX 3.46%, FDRXX 3.52%, SNVXX 3.57%, VMFXX 3.74% |
| Prime (retail) | 3.52-3.70% | SPRXX 3.52%, SWVXX 3.70% |
The risk, liquidity fees (gates were removed in 2023)
After the 2008 Reserve Primary Fund "broke the buck" event, the SEC overhauled Rule 2a-7. Institutional prime MMFs were required to float their NAV; retail prime MMFs keep the $1.00 stable NAV. The 2014 rules also let prime funds impose redemption gates, but the SEC’s 2023 amendments removed gates entirely. Under the current rules:
- Mandatory liquidity fees: institutional prime and institutional tax-exempt MMFs must charge a fee when daily net redemptions exceed 5% of net assets.
- Discretionary liquidity fees: other non-government MMFs, including retail prime funds, may charge a fee of up to 2% if the board decides it is in the fund’s best interest.
Government and Treasury MMFs are not required to impose these fees, their underlying collateral is so liquid that the SEC views them as unnecessary.
When the gates have actually been raised
In March 2020, several prime MMFs experienced heavy redemptions as institutional investors fled to government funds. The Federal Reserve had to launch the Money Market Mutual Fund Liquidity Facility (MMLF) to backstop the prime category and prevent gates from being imposed. Government and Treasury MMFs were not affected.
In September 2008, the Reserve Primary Fund broke the buck due to Lehman Brothers commercial paper exposure. The fund was liquidated and shareholders eventually received ~99 cents on the dollar, but redemptions were frozen for months. Investors learned the hard way that "money market" does not mean "money in the bank."
Is the prime pickup worth it?
For an investor with $100,000 in a MMF, 20 bps of extra yield is $200/year. The question is whether $200/year of yield pickup compensates for:
- The (small) probability of a liquidity fee or redemption gate in a stress event
- The (smaller) probability of a "break the buck" event on a prime fund
- The peace-of-mind cost of holding edge-case credit risk in your "cash" sleeve
For most retirement-age buyers focused on capital preservation: no. The yield pickup is too small to justify the tail-risk exposure. Stick with government or Treasury.
For institutional treasury managers running tens of millions in cash with multi-decade time horizons: maybe. The expected value of the yield pickup over time exceeds the expected cost of an occasional gate event.
The case for Treasury over government
If you've decided government over prime, the next decision is government vs. Treasury. Government MMFs include agency paper and repo (still very safe, but one additional layer removed from direct Treasury collateral). Treasury-only MMFs hold direct Treasuries only.
The yield spread is small and not always in the same direction: on the late-September 2026 checks government beat Treasury by 6 bps at Schwab (SNVXX 3.57% vs SNSXX 3.51%), while Vanguard’s Treasury fund edged its government fund (VUSXX 3.76% vs VMFXX 3.74%). The state-tax advantage of Treasury MMFs is substantial in high-tax states. See best Treasury MMFs →
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: Has a government or Treasury MMF ever broken the buck?
A: Once. The Community Bankers U.S. Government Money Fund in 1994 lost ~4% on derivatives exposure (it held structured notes that lost value when rates rose). The fund was wound down and shareholders received a partial recovery. Since the 1994 incident, government MMFs have not been allowed to hold the derivatives that caused the loss.
Q: Can I hold both?
A: Yes. Some sophisticated investors split between a government MMF for safety and a prime MMF for the yield pickup. The split is personal and depends on how you feel about the prime-fund tail risk.
Q: What about ultrashort bond funds, same thing?
A: No. Ultrashort bond funds (e.g. PIMCO MINT, JPM JPST) are not MMFs, they have a floating NAV and can lose principal. Yield is typically 30-100 bps higher than prime MMFs. Different risk profile.
Q: Does the prime yield pickup matter at all?
A: It matters more for large institutional cash piles and less for retail. A treasury manager moving $50M of corporate cash will pursue every basis point. A retiree with $250K of personal cash is usually better off in government or Treasury where the worst-case scenario is "I earned 10 bps less than I could have."
About Hans Goldstein: Independent retirement income specialist. CA Life License #4273294. NPN #20602398. Reviews 30+ carriers and the full menu of cash alternatives. Phone: 213-414-2808. Email: hans@hansgoldstein.com.
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 is general education, not a personal recommendation or an offer of any 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.