When a mutual fund or ETF holds Treasury securities, the interest those bonds pay gets bundled into your ordinary dividends on Form 1099-DIV, even though that interest is exempt from state and local income tax. U.S. government interest reported as dividends still qualifies for the state tax exemption, but you have to claim it yourself using the fund’s supplemental tax statement, because the 1099-DIV does not break it out.
Why Treasury Interest Ends Up in Your Dividend Box
You don’t own the bonds when you buy a Treasury fund. The fund owns them, collects the coupon interest, and distributes that income to shareholders alongside every other type of income the portfolio generates. The IRS treats all of it as a distribution from an investment company and reports it on Form 1099-DIV.1Internal Revenue Service. About Form 1099-DIV, Dividends and Distributions Treasury interest lands in Box 1a (“Total ordinary dividends”) right next to corporate dividends and other taxable income. There is no dedicated box on the 1099-DIV that isolates the government portion.
Fund companies publish a supplemental tax statement, usually in January or February, that lists the percentage of the year’s ordinary dividends derived from U.S. government obligations. That statement is where the exemption lives. If you never open the PDF in your brokerage tax documents section, you will pay state tax on income your state has no authority to tax.
One boundary worth naming: if you hold Treasuries directly through TreasuryDirect or as individual bonds in a brokerage account, the interest is reported on Form 1099-INT, Box 3, and identified as Treasury interest on the form itself.2Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID The dividend-reporting problem is specific to funds.
The Federal Law Behind the Exemption
The exemption comes from 31 U.S.C. § 3124, which prohibits states and local governments from taxing obligations of the United States, including the interest those obligations pay.3Office of the Law Revision Counsel. 31 USC 3124 Exemption from Taxation Treasury interest is fully taxable at the federal level and off-limits at the state and local level. Your state will not apply the subtraction for you. The exempt income flows into your state return through federal adjusted gross income, and it is your job to subtract it back out.
Which Holdings Actually Qualify
Direct obligations of the U.S. government qualify without controversy: Treasury bills, notes, bonds, TIPS, and Series EE and Series I savings bonds. Interest on all of these is exempt, including the original issue discount on T-bills.
Federal agency securities are more complicated. Their state tax treatment depends on each agency’s enabling statute, not the blanket rule in § 3124.
Agencies That Typically Qualify
Federal Home Loan Bank bond interest is exempt from state and local income tax under 12 U.S.C. § 1433, which extends the exemption to principal and interest on the banks’ obligations.4Office of the Law Revision Counsel. 12 US Code 1433 – Exemption from Taxation Several other agency securities carry their own statutory exemptions, with the specifics varying by statute.
Agencies That Do Not Qualify
Fannie Mae and Freddie Mac bond interest is not exempt from state and local tax, even though both entities are federally chartered. Their charter acts exempt the corporations from most state taxes, but that corporate-level shield does not reach the interest paid to bondholders.5Office of the Law Revision Counsel. 12 US Code 1452 – Federal Home Loan Mortgage Corporation Fannie and Freddie securities sit in many broad bond funds alongside Treasuries, and a fund’s supplemental statement will exclude their interest from the qualifying percentage.
Capital Gains Are Never Exempt
Only the interest component qualifies. If you sell fund shares or a Treasury bond for a gain, that gain is fully taxable at the state level. The exemption covers the income stream, not appreciation.
The Fund Threshold Rule That Can Wipe Out the Exemption
Many states will only pass the exemption through to fund shareholders if the fund itself holds enough U.S. government obligations. The most common cutoff is 50%: the fund must hold at least 50% of its assets in qualifying government securities at the end of each quarter of its fiscal year. California, Connecticut, and New York use this benchmark, and other states have adopted similar rules.
A broad bond fund with 30% Treasuries and 70% corporate holdings fails the test, and shareholders in threshold states get no state exemption at all on that fund’s distributions. A dedicated Treasury fund at 95% government obligations clears it easily. Check this before buying a bond fund if the state exemption matters to your after-tax return. The supplemental tax statement usually indicates whether the fund met the threshold in each state that requires one.
How to Calculate and Claim the Subtraction
Pull the supplemental tax statement for each fund you hold. 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.6Internal Revenue Service. IRS Form 1099-DIV – Dividends and Distributions The result is the amount to subtract on your state return.
An example. You received $8,000 in ordinary dividends from a Treasury fund. The supplemental statement reports that 45% of the fund’s ordinary dividends came from qualifying U.S. government obligations. Your exempt amount is $3,600. Enter that figure as a subtraction on the appropriate line of your state income tax 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. The 1099-DIV itself does not show the breakdown, and your state tax authority may ask for documentation if the subtraction is questioned.
Two things to verify before you claim the full amount. First, that any threshold rule your state imposes was met by the fund. Second, that the qualifying percentage you are using is the one your state accepts. Some states exclude interest from agencies like Fannie Mae and Freddie Mac from the qualifying figure, and reputable fund statements will already reflect that.
If You Missed the Exemption in Prior Years
You can usually file amended state returns to claim refunds for years you overlooked the subtraction. Most states allow amendments going back three years, though the statute of limitations varies. Pull the supplemental statements from your prior-year brokerage tax documents, run the calculation for each year, and file an amended return with the subtraction attached.
For smaller portfolios the refund may not justify the paperwork. For a meaningful Treasury position in a high-tax state, several years of missed subtractions can add up to a substantial refund.