Bond income adjustments tax pros should verify before filing

A bond looks simple until the brokerage statement shows up. Then there’s accrued interest, a market discount adjustment, a premium amortization line, and maybe some tax-exempt income mixed in. Add an inherited savings bond, and a single Form 1099-INT, Interest Income, or Form 1099-OID, Original Issue Discount, can turn into a real research project.

The questions below came straight from tax professionals working through these situations in practice. They’re a good reminder that the number printed on a Form 1099 rarely tells the whole story, and it’s worth looking past the total before it goes into the software.

Separating taxable and tax-exempt interest

Taxable interest is reported on Form 1040, line 2b, and detailed on Schedule B (Form 1040), Interest and Ordinary Dividends, when required. Tax-exempt interest doesn’t belong in that total; report it separately on Form 1040, line 2a. Bonds purchased between interest payment dates need a closer look. When a client buys mid-period, part of what they pay the seller covers interest the seller already earned.

Under Treas. Reg. §1.61-7(d), that “negative accrued interest” isn’t the buyer’s income. Treat it as an offset to the interest received and reduce the bond’s basis by the accrued interest amount. And if a client holds a tax-exempt bond bought at a premium, report the interest net of the required amortization. Skip that step and the return can overstate reported tax-exempt interest.

Tax-exempt doesn’t always mean tax-free

A municipal bond’s stated interest can be exempt from federal tax under §103, while part of the gain on that same bond isn’t exempt at all. Market discount is the usual culprit. When a client acquires a bond with market discount, §1276 and §1278 generally treat the portion of gain attributable to accrued market discount as ordinary taxable interest, not capital gain, even when the bond’s stated interest is tax-exempt. Separately, interest from specified private activity bonds can be relevant for alternative minimum tax (AMT) purposes.

Lump that discount in with the rest of the capital gain, and the return understates ordinary income and misstates its character. And if the bond is a specified private activity bond, the return may miss an AMT adjustment as well. It’s worth pulling those items apart before the return goes final.

Premium amortization on municipal bonds isn’t optional

Some clients would rather skip amortizing a municipal bond premium and take a bigger capital loss when the bond sells. It’s a natural instinct, but §171(a)(2) and Treas. Reg. §1.171-1 don’t allow it: amortization on a tax-exempt bond premium is mandatory.

It reduces the tax-exempt interest reported each year and lowers the bond’s basis, so gain or loss at sale comes from that adjusted number, not the original purchase price. A bond exempt from both federal and state tax still follows the same federal amortization rule; the extra state exemption doesn’t change it.

Inherited savings bonds bring an election decision

Savings bond interest is usually deferred until redemption or maturity, unless the original owner elected to report it annually. If the owner dies before redemption or maturity, §454(a) lets the executor elect to include interest accrued through the date of death on the decedent’s final Form 1040, as confirmed in Rev. Rul. 68-145. Make that election, and the beneficiary only picks up interest earned after death.

Skip it, and the deferred interest is generally income in respect of a decedent under §691. That holds even if the Form 1099-INT later arrives under the estate’s EIN. The pre-death portion can still be reported on the final individual return once the §454(a) election is properly made.

Don’t forget the state tax return

Interest on U.S. Treasury obligations, including savings bonds, is taxable federally under §61 but generally exempt from state and local tax under 31 U.S.C. §3124. Subtraction rules and documentation vary by state, though, so it’s worth confirming exactly what obligation is on the statement rather than assuming every “government interest” line qualifies.

Most bond reporting errors trace back to the same habit: entering the Form 1099-INT total without checking what’s behind it. A quick look at the acquisition date, purchase price, and bond type usually catches the adjustment before it becomes a problem on the return.