The short answer
An exchange cooperation clause is a paragraph in a real estate purchase contract in which the other party agrees to cooperate with your section 1031 exchange, including the assignment of the contract to a qualified intermediary, at no added cost, delay or liability to them. No statute or regulation requires the clause by name. It exists because Reg. section 1.1031(k)-1(g)(4)(v) treats your intermediary as a party to your contract only if your rights are assigned to it and every party is notified in writing on or before the transfer.
At a glance
| What it is | Contract wording in which the counterparty agrees to cooperate with your exchange and accept an assignment to your intermediary |
|---|---|
| Regulatory hook | Assignment plus written notice to all parties, under Reg. section 1.1031(k)-1(g)(4) |
| Where it goes | In both the sale contract for the old property and the purchase contract for the replacement |
| Usual three parts | Cooperation, permission to assign to a qualified intermediary, and a hold-harmless for the other party |
The clause is contract practice built around one regulatory step: assignment with written notice.
Under the qualified intermediary safe harbor in Reg. section 1.1031(k)-1(g)(4), the intermediary must acquire your old property, transfer it, acquire the replacement and transfer it to you. Paragraph (g)(4)(iv) lets that happen on paper: the intermediary is treated as acquiring and transferring property when it enters into the contract and the property then passes under that contract, so the deeds can run directly between you and the other party.
Paragraph (g)(4)(v) supplies the mechanism. The intermediary is treated as entering into your existing contract if your rights are assigned to it and all parties are notified in writing of the assignment on or before the date of the relevant transfer. The cooperation clause gets the other side's agreement to that step when the contract is signed, so the notice of assignment is routine at closing rather than a negotiation.
Illustrative wording covers cooperation, assignment and a hold-harmless, and you need it in both contracts.
The following is illustrative drafting, not a form from any source; have your attorney adapt it to your state and contract:
- Cooperation: "Buyer acknowledges that Seller intends this sale to be part of a like-kind exchange under section 1031 of the Internal Revenue Code and agrees to cooperate with Seller to that end."
- Assignment: "Seller may assign its rights, but not its obligations, under this Agreement to a qualified intermediary, and Buyer will acknowledge the assignment in writing."
- Hold-harmless: "Buyer will incur no additional cost, liability or delay in closing, and Seller will indemnify and hold Buyer harmless from any claim arising from the exchange."
A worked example shows where the clause bites: the replacement contract and the contract that forbids assignment.
Hypothetical: you sign to sell a rental for $900,000 and later agree to buy a $1,200,000 warehouse. The sale contract carries the clause, so the buyer signs the assignment notice and the proceeds go to your intermediary. The warehouse contract, written on the seller's form, has a no-assignment term and no exchange paragraph. Because section 1031 deferral in a deferred exchange depends on the replacement side meeting the safe harbor too, you add a mirror clause by addendum before the replacement closing. Illustration only, in round numbers; your own figures belong with your CPA.
The regulation requires notice, not consent, but it does not override a contract that bars assignment. That is the practical reason the clause matters. It is also why the hold-harmless sentence matters to the other side: it answers the common worry covered in what it means when the buyer is doing a 1031 exchange and whether a 1031 delays closing. For whether you need the clause at all, see the exchange cooperation clause question.
Related questions
Can I add an exchange cooperation clause after the contract is signed?
Yes, by a signed addendum. What the regulation needs is the assignment and written notice to all parties on or before the transfer, so the timing of the clause itself is a contract matter.
Does the clause make the sale contingent on my exchange?
Not unless you write it that way. The usual wording only asks for cooperation and keeps the other side free of cost and delay, so your exchange failing does not by itself excuse either party from closing.
Does the other party take on risk by agreeing?
The hold-harmless sentence is meant to keep exchange cost and liability with you. In practice the other party's role is to accept the assignment and acknowledge the notice.
Sources
Checked against these publications on September 30, 2026. Rules and figures change; confirm the current version with your CPA or attorney before you act. This page is general information, not tax or legal advice.