When a bond fund holds U.S. Treasuries, the interest those bonds generate reaches you as a “dividend” on Form 1099-DIV, pooled with every other kind of income the fund earned. That treasury interest reported as dividends is still exempt from state and local income tax, but your 1099-DIV won’t flag it. To claim the exemption, pull your fund’s supplemental tax statement, find the percentage of ordinary dividends derived from U.S. government obligations, multiply your Box 1a dividends by that percentage, and enter the result as a subtraction on your state return.
Why Treasury Interest Lands on a 1099-DIV
When you hold Treasuries through a mutual fund or ETF, the fund owns the bonds, collects the interest, and distributes that income to you alongside everything else in the portfolio. The IRS treats all fund distributions the same way and reports them on Form 1099-DIV, the standard form for dividends and distributions from investment companies.1Internal Revenue Service. About Form 1099-DIV, Dividends and Distributions The Treasury portion lands in Box 1a (“Total ordinary dividends”) right next to corporate dividends and other taxable income. Nothing on the form itself tells you how much came from Treasuries.
The fund does break it out, just not on the 1099-DIV. Once a year, usually in January or February, the fund company or brokerage publishes a supplemental tax statement showing what percentage of its distributions came from U.S. government obligations. That percentage is the key to the state subtraction. Investors who never open that PDF end up paying state tax they don’t owe.
If you hold Treasuries directly rather than through a fund, the reporting is cleaner. Interest on individual Treasuries purchased through TreasuryDirect or a brokerage shows up on Form 1099-INT in Box 3 (“Interest on U.S. Savings Bonds and Treasury obligations”), separate from the Box 1 line used for other taxable interest.2Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID Box 3 does the sorting for you.
The Rule That Makes the Subtraction Possible
Federal law at 31 U.S.C. § 3124 prohibits states and local governments from taxing obligations of the United States, and the prohibition covers both the obligations themselves and the interest they generate.3Office of the Law Revision Counsel. 31 USC 3124 Exemption from Taxation Treasury interest is fully taxed federally and fully exempt at the state and local level.
The savings are real for anyone with meaningful Treasury exposure in a high-tax state. Someone with a 9% state income tax rate and $10,000 of Treasury interest saves $900 by claiming the subtraction. In a state with no income tax, the exemption has nothing to do.
The exemption is never automatic. Treasury income flows from your federal return into your state return as part of adjusted gross income, and the state will not back it out for you.
How to Claim the Subtraction on Your State Return
The mechanics differ depending on how you hold the bonds.
Treasuries Held Through a Fund or ETF
Start with the fund’s supplemental tax statement for the year. Find the percentage of ordinary dividends attributable to U.S. government obligations. Multiply your Box 1a ordinary dividends from that fund’s 1099-DIV by that percentage.4Internal Revenue Service. IRS Form 1099-DIV – Dividends and Distributions If you received $8,000 in ordinary dividends from a fund and the supplemental statement reports 45% from qualifying government obligations, your exempt amount is $3,600.
Enter that figure as a subtraction on the appropriate line of your state return. Most states have a dedicated line or schedule for income exempt from state taxation. Repeat the calculation for every fund you hold and add the results. Keep the supplemental statements with your tax records; your state tax authority can’t see the breakdown on the 1099-DIV itself and may ask for documentation on audit.
Treasuries Held Directly
Take the amount in Box 3 of your 1099-INT and enter it as a subtraction on your state return.2Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID No percentage math, no supplemental statement.
The Threshold Rule That Can Zero Out the Exemption
Many states impose a minimum portfolio threshold on funds before any of the distribution qualifies. The most common cutoff is 50%: the fund must hold at least 50% of its assets in U.S. government obligations at the end of each quarter of its fiscal year. California, Connecticut, and New York all use this benchmark, and other states have adopted similar rules.
A broad-market bond fund holding 30% Treasuries and 70% corporate bonds fails that test, and shareholders in threshold states get no state exemption at all on its distributions. A dedicated Treasury fund holding 95% government obligations clears it easily. Check the fund’s supplemental tax statement; it usually indicates whether the threshold was met for the states that apply one.
Which Holdings in the Fund Actually Count
The percentage reported on the supplemental statement is built from the fund’s qualifying obligations, not everything that looks federal. Knowing what’s inside the percentage helps you read the statement correctly.
Direct U.S. government obligations qualify in full: Treasury bills, Treasury notes, Treasury bonds, Treasury Inflation-Protected Securities (TIPS), and Series EE and Series I U.S. savings bonds.3Office of the Law Revision Counsel. 31 USC 3124 Exemption from Taxation Interest on Federal Home Loan Bank bonds is also exempt from state and local income tax under 12 U.S.C. § 1433.5Office of the Law Revision Counsel. 12 US Code 1433 – Exemption from Taxation
Fannie Mae and Freddie Mac bonds do not qualify. Both entities are federally chartered, and their charters exempt the corporations themselves from most state taxes, but the exemption does not extend to interest received by bondholders.6Office of the Law Revision Counsel. 12 US Code 1452 – Federal Home Loan Mortgage Corporation Many bond funds hold Fannie and Freddie paper alongside Treasuries, and the fund’s reported percentage will correctly exclude that interest. If the percentage looks lower than you expected for a “government” bond fund, agency mortgage-backed securities from Fannie and Freddie are usually the reason.
Only interest qualifies. Capital gains from selling Treasury bonds or fund shares are fully taxable at both the federal and state level.
If You Missed the Subtraction in Prior Years
Most states allow amended returns going back three years, though the specific statute of limitations varies. Pull the supplemental statements from your old brokerage tax documents, run the percentage calculation for each year, and file an amended state return for each year still open.
For small positions, the refund may not justify the paperwork. For a sizable Treasury allocation in a high-tax state, several years of missed subtractions can add up to a four-figure refund.