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Treasury money market fund.

A Treasury money market fund is a money market fund that holds only short-term U.S. Treasury securities, prized for safety and often state-tax advantages.
Verified July 2026 · Source: SEC (Investor.gov)
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Treasury money market fund
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In plain English

A Treasury money market fund is a type of money market mutual fund that invests only in short-term U.S. government debt, mainly Treasury bills. Because its holdings are backed by the U.S. government, it is considered one of the safest places to park cash, and the interest is often exempt from state and local income tax, unlike interest from a bank savings account. It is not FDIC-insured, since it is an investment rather than a deposit, but the credit risk is minimal. Investors use it for cash they want to keep safe and liquid while earning a competitive yield.

Most useful ages
22 to 80
001The Real Cost
You hold 30,000 dollars in a Treasury money market fund yielding around 4 percent, or about 1,200 dollars a year. Because the holdings are Treasuries, that interest is typically exempt from state income tax.

01Why it matters

For parking cash safely, a Treasury money market fund can offer government-backed holdings and state-tax-free interest, so it is a useful alternative to a savings account for larger balances.

02The math, step by step

You hold 30,000 dollars in a Treasury money market fund yielding around 4 percent, or about 1,200 dollars a year. Because the holdings are Treasuries, that interest is typically exempt from state income tax.

03What this is NOT

Do not confuse with An FDIC-insured savings account

A Treasury money market fund is NOT an FDIC-insured deposit. It is an investment fund, so it lacks FDIC coverage, though its Treasury holdings carry minimal credit risk and its interest is often state-tax-free.

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Last reviewed July 13, 2026 · Reviewer Joseph Citizen, Founder