Neither a money market fund nor a Treasury bill is the universal winner for short-term cash. Compare their current yields on the same date, estimate after-tax returns, and match the investment’s liquidity to when you need the money. A Treasury bill has a stated maturity; a money market fund offers redeemable shares but does not guarantee your principal or a $1 share price.
What you own—and what can happen to your principal
Money market fund
A money market fund is a mutual fund that invests in short-term debt securities. It generally seeks to maintain a stable net asset value, often $1 per share, but it is not a money market deposit account and is not FDIC-insured. Its share value can fall. The SEC explains that “an investment in a money market fund, however, has no FDIC guarantee” in its Investor Bulletin: Focus on Money Market Funds. Check the fund’s prospectus and current disclosures for its category, holdings, risks, and operating terms.
Treasury bill
A Treasury bill is an individual U.S. government security with a stated maturity. TreasuryDirect lists 4-, 6-, 8-, 13-, 17-, 26-, and 52-week bills. Bills are generally sold at a discount or at par; the difference between the purchase price and face value is the interest. At maturity, the holder is paid face value. You can also sell a bill before maturity, but the sale price can be above or below what you paid.
See TreasuryDirect’s Treasury Bills page for bill terms, purchase details, and current schedules. Its statement that the holder is paid face value at maturity describes the maturity payment, not the price you are guaranteed if you sell early.
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Compare the features that affect your decision
| Factor | Money market fund | Treasury bill |
|---|---|---|
| What you own | Shares in a mutual fund holding short-term debt; the fund’s category and portfolio matter. | An individual Treasury security with a specific maturity and auction-set price or discount rate. |
| How return is earned | Fund yield and distributions change with portfolio income, market rates, and expenses. | Usually bought below face value; the difference is received as interest at maturity. |
| Access to cash | You redeem shares through the fund and its platform. Check cutoff times, settlement, and any fund-specific restrictions; redemption is not necessarily instant. | Cash is paid at maturity. Selling sooner is possible, but the market price may differ from your purchase price. |
| Principal risk | Seeks a stable share price, often $1, but is not an insured deposit and can lose value. | Face value is paid at maturity under the security’s terms; an early sale exposes you to market-price risk. |
| Taxes | Tax treatment depends on income sources, distributions, and your jurisdiction. Do not assume all fund income is state- and local-tax-exempt. | TreasuryDirect says interest is subject to federal tax and exempt from state and local taxes. |
| Costs and setup | Review expense ratio, share class, minimum investment, account or transaction charges, and brokerage terms. | Check for brokerage commissions or transaction charges and the purchase route. TreasuryDirect lists a $100 minimum and $100 increments. |
Match liquidity to the date you need the cash
If the cash date is known
Consider a bill whose maturity is close to the date you need the money, allowing for auction availability and settlement. Holding to maturity gives you a defined maturity payment. Selling before then is not equivalent: the price can move, and you may receive less than your purchase price.
If the cash date is uncertain
Focus on the actual redemption or sale process. For a fund, check the platform’s order cutoff, settlement timing, and any restrictions in the prospectus. For a bill, understand how and where you would sell it and that the sale price is not fixed. Do not assume either option makes cash immediately available in every circumstance.
Compare yields on equal terms
Use yield figures published for the same date. A fund’s seven-day yield and a bill’s discount rate use different conventions, so comparing the headline numbers without adjustment can mislead. Check the fund’s current yield and fee schedule, and compare its yield after operating expenses with the bill’s investment return over the same holding period.
- Account for brokerage costs, if any, and cash that may sit uninvested between maturities or reinvestments.
- Do not call a yield current unless it has been checked for the date of publication. Fund yields and auction yields change over time.
- Do not treat an illustrative pricing example as a live market quote. TreasuryDirect’s bill pricing information explains discount pricing; an example rate there is illustrative, not a current yield.
Estimate the after-tax return
For a Treasury bill, TreasuryDirect’s general tax guidance is that interest is taxable federally but exempt from state and local taxes. Review its tax information for Treasury marketable securities.
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Fund tax treatment depends on the fund’s income sources, distributions, and your state and local rules. Some Treasury-oriented funds seek income exempt from most state and local individual income taxes, but that is not a guarantee that every distribution—or every investor’s income—is exempt. For an example of a fund-specific objective and expenses, the Allspring Treasury money market fund prospectus describes its particular fund; do not generalize it to other funds. Check the fund’s prospectus and year-end tax supplement, then estimate both options using your federal tax bracket and applicable state and local rules.
Check costs and purchase details before committing
For a money market fund
- Confirm the fund category and holdings, along with its current prospectus and any applicable share-class details.
- Check the expense ratio, investment minimum, account fees, transaction charges, and redemption terms.
- Verify when a redemption request must be submitted and when proceeds are expected to settle on your platform.
For a Treasury bill
- Compare the bill’s maturity with your cash date and confirm the current auction schedule and settlement date.
- Check any commissions or transaction charges for the route you use to buy or sell.
- TreasuryDirect lists a $100 minimum purchase and $100 increments; check its current bill terms before buying.
A practical decision framework
- Set the cash date. Decide when the money must be available and whether that date is firm.
- Find current terms. On the same date, check the fund’s current yield, expenses, holdings, and redemption timing, and the bill’s available maturity, auction terms, and settlement.
- Normalize the return comparison. Compare the fund’s yield after expenses with the bill’s return over a matching period; account for differing yield conventions and any transaction costs or uninvested intervals.
- Estimate taxes. Apply federal tax and your state and local rules to each option, using fund-specific tax information rather than assumptions about all fund distributions.
- Choose based on access and risk. Prefer the mechanics that fit your cash date and your comfort with a fund’s potential share-price loss or a bill’s early-sale price risk.
This is a U.S. cash-management comparison, not a personalized investment recommendation. Product terms, yields, tax outcomes, and access depend on the specific fund, purchase route, and investor.
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