Treasury Interest: Federal Tax, State Tax, and Form 1099-INT

Treasury securities have an unusual tax split:

Interest is generally taxable for federal income-tax purposes but exempt from state and local income taxation.

That does not make every return generated by a Treasury investment tax-free.

Federal and state treatment of direct Treasuries

Direct U.S. Treasury interest is generally ordinary federal interest income.

Under 31 U.S.C. §3124, qualifying direct U.S. obligations and their interest receive federal protection from state and local taxation within the statute's scope.

Form 1099-INT generally reports Treasury interest separately in box 3.

Discounted Treasury instruments can involve OID and related debt rules. TIPS can create current taxable accruals without equivalent current cash.

Bond premium can affect taxable interest and adjusted basis.

Selling a Treasury is a separate tax event. Do not automatically extend the interest exemption to disposition gain.

Treasury funds are different

A shareholder in a mutual fund or ETF owns the fund interest, not the underlying Treasuries directly.

Do not assume pro-rata state exemption.

For California and New York, preserve the approved 50% qualifying federal-obligation asset threshold at the close of each quarter.

A fund with 49% qualifying obligations should not simply be treated as producing a 49% state-exempt dividend in those jurisdictions.

Federal agencies require identification

Do not infer Treasury treatment merely because an investment uses “government,” “federal,” or “agency” in its name.

Identify the actual issuer and governing authority.