VUSXX State Tax: What Investors Should Know About Tax Treatment by State

When it comes to protecting cash and maintaining liquidity, many conservative investors turn to VUSXX — the Vanguard U.S. Treasury Money Market Fund. It’s known for being a relatively low-risk place to hold funds short-term while waiting out market volatility or parking idle capital.

But with tax season looming, a key question surfaces:

How is VUSXX taxed at the state level?

And more importantly — is VUSXX state tax exempt?

Let’s break down the full picture so you can understand VUSXX state tax treatment, what portion of its income might be exempt in your state (including California), and how to correctly report it.

What is VUSXX?

VUSXX is Vanguard’s U.S. Treasury Money Market Fund – Investor Shares. The fund primarily holds:

• Short-term U.S. Treasury bills

• U.S. Treasury notes

• Repurchase agreements (backed by U.S. Treasuries)

This portfolio structure makes it one of the most conservative offerings in Vanguard’s money market fund lineup. The fund aims to maintain a stable $1.00 share price while paying interest derived from U.S. government obligations.

Is VUSXX State Tax Exempt?

The answer is: partially — and it depends on your state.

VUSXX itself is not classified as a state-tax-exempt fund, like municipal bond funds are. However, a portion of the interest earned from VUSXX may be exempt from state income taxes, because U.S. Treasury securities are typically not subject to state or local tax.

So, is VUSXX state tax exempt?

• ❌ Not entirely.

• ✅ But partially — depending on how much of the fund’s income comes from Treasury obligations.

Each year, Vanguard calculates and publishes the percentage of income from VUSXX that qualifies for state tax exemption. That percentage varies depending on how much of the fund’s income was derived from direct U.S. Treasuries versus other sources like repurchase agreements (which are taxable at the state level).

Why Does the State Tax Treatment Matter?

Because money market funds typically pay modest yields, any tax savings can significantly impact your net return, especially if you’re in a high-tax state like California, New York, or New Jersey.

VUSXX California State Tax – Special Considerations

Many investors specifically ask:

What is the VUSXX California state tax treatment?

California follows federal rules in partially exempting income derived from direct U.S. obligations, including Treasury bills and notes. That means:

• If 90% of VUSXX’s income came from Treasuries, 90% of your earnings from VUSXX may be excluded from your California state income tax.

• However, if part of the income came from repos or other short-term instruments, that portion remains taxable.

California publishes clear rules on how to apply this exemption, and Vanguard provides the data you need each year.

🔗 Vanguard Tax Center is where to find the exact annual breakdown.

How Vanguard Reports VUSXX Tax-Exempt Percentages

At the end of each calendar year, Vanguard releases a document titled “Tax-Exempt Income by State” (or similar). It provides:

• The percentage of total income from U.S. Treasury obligations

• A breakdown for each applicable fund

• Guidance on how to apply those figures when filing your state taxes

For VUSXX, this percentage has historically ranged from 75% to 100%, depending on the year and prevailing market conditions.

Example:

If you earned $1,000 from VUSXX and Vanguard reports that 85% of the income was from U.S. Treasuries, you may be able to exclude $850 from your California (or other state) income tax return — assuming your state honors the exemption.

How to Apply the VUSXX State Tax Exemption

Here’s how to properly handle it:

Check your 1099-DIV
Your broker will report total income from VUSXX on Form 1099-DIV — typically in Box 1a (Total Ordinary Dividends) and Box 1b (Qualified Dividends). Money market fund income is usually all in Box 1a.

Use Vanguard’s annual percentage
Determine what portion of your income came from U.S. Treasury securities by multiplying your total income by the Treasury percentage Vanguard provides.

Apply the exemption on your state tax return
Many states (like California) allow you to subtract this Treasury-derived income from your taxable state income. Check your state’s form instructions.

Consult your tax professional
Rules can vary by state and filing method. When in doubt, ask your accountant.

Which States Recognize the Exemption?

Most U.S. states that charge income tax recognize the exemption for U.S. Treasury interest. These include:

• California

• New York

• Virginia

• Pennsylvania

• Illinois

• Massachusetts

• Connecticut

• Minnesota

However, a few states do not allow this exemption — or only apply it in certain ways. Always check your state’s Department of Revenue website or ask your CPA.

Common Misconceptions About VUSXX State Tax Exemption

Let’s clear up some frequent misunderstandings:

❌ “VUSXX is tax-exempt.”

Not true. It is not federally or fully state tax-exempt. Only a portion of its income may be state-exempt depending on its composition.

❌ “You don’t have to report VUSXX income.”

Incorrect. All income must be reported federally — and most must be reported at the state level, unless properly excluded with documentation.

❌ “It’s like a muni fund.”

No — municipal money market funds (e.g., VMSXX) are built for federal and often state-level tax exemption. VUSXX is not structured this way.

What If You’re in a Tax-Advantaged Account?

If you hold VUSXX inside an IRA, Roth IRA, or 401(k), tax rules are different:

• You don’t pay taxes on earnings annually

• The state tax treatment becomes irrelevant until withdrawal (or may not apply at all in Roth accounts)

In these accounts, VUSXX’s tax characteristics have no bearing on your current tax bill — so optimization should focus on risk and yield, not tax.

Summary: VUSXX State Tax at a Glance

Tax Treatment	Status
Federal Income Tax	✅ Taxable
State Income Tax	⚠️ Partially exempt, depending on fund composition and state
California State Tax	✅ Partial exemption available for Treasury-derived income
IRA / Roth / 401(k)	🚫 Tax-deferred or exempt (depending on account type)

Final Thoughts on VUSXX and State Taxes

If you’re holding VUSXX in a taxable brokerage account, understanding the VUSXX state tax exemption is crucial to making the most of your investment. While it doesn’t offer full tax immunity, the potential for partial state tax exemption makes VUSXX more efficient than a standard savings account — especially in states with high income taxes like California.

The key is to:

• Use Vanguard’s end-of-year reporting

• Check your state’s exemption policies

• Report the correct amount

• Get professional help if your tax situation is complex

Disclaimer

This article is intended for informational purposes only and does not constitute tax, legal, or financial advice. Always consult a certified tax advisor or financial professional before making decisions based on this content.