What happens if the owner dies during a 1031 exchange?

Nothing in the exchange rules stops the clock for a death

The identification and exchange periods in Reg. section 1.1031(k)-1(b)(2) run from the day the relinquished property transferred, and the regulation contains no rule for the death of the taxpayer. The exchange period ends at the earlier of the 180th day or the due date, including extensions, of the return for the year of the sale.

The only postponement mechanism is Rev. Proc. 2018-58, section 17, which applies when the IRS announces relief for a federally declared disaster. One of its listed reasons is a party to the transaction being killed, injured or missing as a result of the disaster. An ordinary death does not qualify.

So the personal representative inherits the same calendar the owner had. The general case of an executor running or starting an exchange is covered in the executor's guide; this page is about the narrower question of what the death itself changes.

When the owner died decides whether the exchange is still worth finishing

Section 1014(a) gives property acquired from a decedent a basis equal to its fair market value at the date of death. Whether that helps depends on what the decedent owned on that date.

If the replacement property had already closed, the deferred gain attached to it is wiped out for income tax purposes by the step-up, which is the outcome holding for the step-up is designed to reach. If the relinquished property had not yet closed, the estate owns a stepped-up property and the sale may produce little gain, so the exchange may not be needed at all.

The hard case is the gap between the two closings. The building was sold during life, so there is nothing left to step up; what the estate holds is a claim to proceeds sitting with the qualified intermediary.

In the gap, a failed exchange leaves the decedent's gain taxable

Publication 559 gives the closest example: a cash-basis owner sells property, dies before being paid, and the gain the decedent would have realized is taxed as income in respect of a decedent. Section 1014(c) denies a step-up for such rights, and section 691(a)(4) applies the same treatment to installment obligations acquired from a decedent.

Because Reg. section 1.1031(k)-1(j)(2) treats funds held by a qualified intermediary as not yet received for installment purposes, a failed exchange whose proceeds are paid out after death is likely to be taxed to whoever receives them, at the decedent's realized gain. Completing the exchange with the estate as buyer is the way to keep deferring it.

That conclusion is drawn from the rules above rather than from a ruling on these facts, so the estate's CPA should confirm the reporting before the decision is made.

Worked example: a November sale and a death before the replacement closes

Hypothetical, round numbers; run your own numbers with your CPA. An owner sells a rental on Sunday November 15, 2026 for $1,200,000 with an $800,000 gain, identifies two properties and a DST interest by December 30, 2026, and dies in January 2027 before any replacement closes.

Day 180 falls on May 14, 2027, but the decedent's final 2026 return is due April 15, 2027, which Publication 559 confirms for calendar-year decedents. Unless the personal representative extends that return, the exchange period ends on April 15.

With the extension filed, the estate can close on any identified property by May 14. If the direct purchases stall, the DST interest on the list closes by subscription to a trust that already owns its property, with no new mortgage for the estate to arrange.

• Day 45: December 30, 2026, already met by the owner's identification.
• Return due date: April 15, 2027, which caps the exchange period unless extended.
• Day 180: May 14, 2027, the latest possible closing.
• Only identified property counts; the estate cannot add new candidates after day 45.

What the personal representative should do in the first week

Speed matters more than strategy here, because the calendar did not pause.

• Get letters of appointment or successor trustee documents to the intermediary, title company and sellers of any identified property.
• Confirm the transfer date, day 45, day 180 and the return due date in writing.
• Decide with the estate's CPA whether completing the exchange is better than taking the proceeds.
• If the final return's due date falls before day 180, file the extension.
• Check closing speed on every identified property; a DST interest on the list needs no inspection or new loan on the estate's side, and its timing is covered in how quickly a DST can close.