Can my sibling and I swap properties if we both hold for two years?

A direct swap qualifies, and the two-year condition applies to both of you

Nothing in section 1031 bars an exchange between relatives. What section 1031(f)(1) does is take nonrecognition away when you exchange with a related person and, before two years after the last transfer, either the related person disposes of the property you gave them or you dispose of the property you got from them. Section 267(c)(4) puts your brothers and sisters, whole or half blood, on the family list, and section 1031(f)(3) adopts that list.

Notice that the rule is symmetrical. Your sister is a related person to you, and you are a related person to her. One early sale by either of you breaks the exchange for both, because each of you meets the test from your own side.

The reason Congress wrote the rule is basis shifting. A sibling with a high basis can take a low-basis property in a swap, sell it and report little gain, while the family has effectively cashed out of the low-basis asset. The Ninth Circuit walked through exactly that pattern in Teruya Brothers v. Commissioner, and the two-year hold is what stops it.

The clock starts at the last transfer and stops while either of you is protected from loss

Count two years from the date of the last transfer that was part of the exchange, not from the date you signed the agreement. Publication 544 says the same, and adds that any period during which the holder's risk of loss is substantially diminished does not count.

Section 1031(g) names the three ways that happens: holding a put on the property, another person holding a right to acquire it, or a short sale or similar transaction. A side letter giving your brother an option to buy your new property back, or a buy-sell arrangement between you, can stretch the two years until it lapses.

Leave purchase rights out of the deal, and the clock is easy to prove.

Worked example: an early sale by one sibling costs both siblings

Hypothetical, round numbers; run your own numbers with your CPA. You own a fourplex worth $800,000 with an adjusted basis of $200,000, after $100,000 of depreciation. Your sister owns a small retail building worth $800,000 with a basis of $750,000. You swap deeds in March 2026 with no cash changing hands, so neither of you recognizes gain.

In May 2027 your sister sells the fourplex for $800,000. Her basis in it is her old $750,000, so without the related-party rule she would report only $50,000 of gain, and your $600,000 gain would stay deferred inside the retail building. That is the cash-out the rule targets.

Under section 1031(f) both exchanges fail as of May 2027. You report your $600,000 gain on your 2027 return even though you sold nothing. If you are in the top bracket, $100,000 is taxed at up to 25%, $500,000 at 20% under the thresholds in Rev. Proc. 2025-32, and the 3.8% net investment income tax can apply on top, for a federal bill near $147,800. Your sister reports her own $50,000.

• If neither of you sells until after March 2028, both deferrals stand.

Form 8824 asks about the swap for three filing seasons

In the year of the swap, answer Yes on line 7 of Form 8824 and complete Part II. The instructions then require the form again for each of the two years after the exchange, with lines 9 and 10 asking whether either of you disposed of the property.

If one of you did, line 11 lists the exceptions: a disposition after the death of either party, an involuntary conversion where the threat arose after the exchange, or a showing that neither the exchange nor the disposition had tax avoidance as a principal purpose. If none applies, you complete Part III and report the deferred gain as if the exchange had been a sale.

The IRS instructions give two examples of exchanges where tax avoidance generally will not be seen as a principal purpose that matter to siblings: an exchange where neither party gains a tax advantage from shifting basis, and an exchange of undivided interests in different properties that leaves each related party with the whole of one property or a larger interest in it. Siblings who co-inherited two buildings and split them one each fit the second example.

When a swap is the wrong tool, and where a trust interest fits

A swap only works if both of you want to keep owning real estate for at least two more years. If one sibling wants cash, a direct swap followed by a sale is the transaction the rule exists to tax. The cleaner path is for that sibling to sell to an outside buyer, or to sell to you for cash, which is covered in selling your property to a family member.

Buying your sibling's building through an intermediary while your sibling keeps the cash is a different and riskier deal, explained in buying replacement property from a relative. The full mechanics of the clock are in the two-year rule for related-party exchanges, and the family list is in who counts as a related party.

If you want out of active management instead, each of you can run a separate exchange into property bought from unrelated sellers, including a beneficial interest in a Delaware Statutory Trust. A trust sponsor is not your relative, so that leg carries no two-year related-party condition.