An assignment clause controls whether and how a party can transfer its rights and obligations under a contract to someone else. Most commercial contracts restrict it: neither party can assign without the other's consent. The clause looks like boilerplate and gets skimmed, but it decides whether you can sell your business cleanly, hand a contract to a subsidiary, or get stuck doing business with whoever bought your counterparty.
TL;DR
- An assignment clause says whether a party can transfer the contract to a third party, and on what terms. Most commercial contracts require the other party's consent.
- The standard fight is the consent standard: "sole discretion" (an absolute veto) versus "not to be unreasonably withheld" (a veto you have to justify). Push for the latter.
- The change of control exception is the most negotiated carve-out: whether you can assign freely to an acquirer or affiliate, or whether an acquisition is treated as a prohibited assignment.
- "Successors and assigns" binds the contract to whoever properly steps into each party's shoes; it is not a license to assign, just confirmation that a permitted assignment carries the contract with it.
- The biggest trap is a clause that silently blocks assignment to an acquirer or affiliate, which can derail an M&A deal or a routine reorganization.
What an assignment clause actually does
Assignment has two parts that get conflated: transferring rights and delegating duties. The clause usually addresses both as "assignment," but the underlying mechanics differ.
Assignment of rights. Handing your benefits under the contract (the right to be paid, the right to delivery) to a third party. Absent a restriction, many contract rights are freely assignable.
Delegation of duties. Handing your obligations (the duty to perform, to pay) to a third party. The original party usually stays liable unless the contract says otherwise (a novation), because the counterparty bargained for that party's performance.
The default rule under the common law and the UCC for goods is that contracts are generally assignable unless assignment would materially change the other party's risk or the contract bars it. So an anti-assignment clause is how parties override the permissive default and keep control over who they deal with.
A clean clause states: the consent standard, the carve-outs (affiliates, change of control), whether a barred assignment is void or merely a breach, and that the contract binds successors and permitted assigns.
Why it matters: the dollars at stake
Imagine a founder selling their company, where the buyer is paying largely for a portfolio of customer contracts worth $4,000,000 a year, and those contracts say assignment requires consent in the counterparty's sole discretion.
- If the buyer must chase consent from every customer and a few refuse, those contracts cannot transfer cleanly, the revenue at risk gets discounted, and the purchase price drops to reflect it.
- If the contracts instead allow assignment to an acquirer without consent (a change of control carve-out), the whole book transfers at closing and the deal value holds.
The difference is one carve-out, and it can move the sale price by a meaningful fraction of that $4,000,000 stream. This is an illustrative example, but assignment language is a standard line item in M&A diligence for exactly this reason.
Who wants what
| Party wanting to assign | Counterparty | |
|---|---|---|
| Consent | Not required, or not unreasonably withheld | Required, sole discretion |
| Affiliate transfer | Allowed without consent | Consent required |
| Change of control | Free assignment to acquirer | Treated as prohibited assignment |
| Effect of breach | Breach only (contract survives) | Void assignment (no transfer at all) |
| Ongoing liability | Released on assignment (novation) | Original party stays liable |
| Successors | Binds the other side's successors too | Mutual |
The party that expects to be acquired or to reorganize wants freedom to assign to affiliates and acquirers; the counterparty wants to control who it ends up bound to. The compromise usually lives in the carve-outs.
Market-standard language
A balanced mutual assignment clause reads close to this:
ASSIGNMENT. Neither party may assign or transfer this Agreement, in whole
or in part, without the other party's prior written consent, which will
not be unreasonably withheld, conditioned, or delayed. Notwithstanding the
foregoing, either party may assign this Agreement without consent to (a)
an affiliate, or (b) a successor in connection with a merger,
acquisition, or sale of all or substantially all of its assets, provided
the assignee assumes all obligations under this Agreement. Any assignment
in violation of this Section is void. This Agreement binds and benefits
the parties and their respective permitted successors and assigns.
Three pieces carry the weight: the "not unreasonably withheld" consent standard, the affiliate and change of control carve-outs (which let normal corporate activity proceed), and the "void" remedy (a prohibited assignment does not transfer anything, rather than just triggering a damages claim). The counterparty's protection is the assumption requirement: the assignee must take on the obligations, not just the rights.
The negotiation: standard, fallback, walk-away
| Issue | Opening position | Fallback both sides accept | Walk-away |
|---|---|---|---|
| Consent standard | No consent needed | Not to be unreasonably withheld | An absolute, unexplained veto |
| Affiliate transfer | Free, no consent | Free, with notice and assumption | Consent required even for affiliates |
| Change of control | Free assignment to acquirer | Free unless acquirer is a direct competitor | Acquisition treated as a blocked assignment |
| Effect of breach | Breach only | Prohibited assignment is void | No consequence stated (ambiguous) |
| Ongoing liability | Full release (novation) | Original party stays liable until assignee performs | Permanent liability after a clean transfer |
| Successors | Mutual binding | Mutual binding | One-sided |
The standard landing: mutual consent not unreasonably withheld, free assignment to affiliates and acquirers (subject to a competitor exception and an assumption requirement), and a "void" remedy. That keeps both sides able to run their corporate affairs while protecting against being handed to a rival.
Common carve-outs / variations
- Affiliate transfers. Assignment within the corporate family without consent, often with notice and an assumption of obligations.
- Change of control / successor. Free assignment to an acquirer or to the surviving entity in a merger, usually conditioned on the assignee assuming the contract.
- Competitor exception. The one situation where the counterparty keeps a veto: assignment to a named or defined direct competitor.
- Assignment of rights only. Some clauses allow assigning the right to payment (for financing or factoring) while barring delegation of duties.
- Novation language. Spell out whether the original party is released on assignment or stays liable. Silence usually means it stays liable.
A carve-out that preserves corporate freedom while protecting the counterparty:
A party may assign this Agreement without consent to an affiliate or to a
successor in a merger, acquisition, or sale of substantially all assets,
provided that (i) the assignee is not a direct competitor of the other
party and (ii) the assignee assumes in writing all obligations under this
Agreement. The assigning party will provide prompt written notice.
Jurisdiction and enforceability notes
Anti-assignment clauses are generally enforceable, but the details turn on state law and drafting. Hold these at the principle level:
- Contracts are assignable by default; the clause overrides that. Under the common law and the UCC for goods, rights are generally assignable unless assignment materially changes the counterparty's position or the contract restricts it. The anti-assignment clause is the override, so its precise wording controls.
- "Void" versus "breach" matters. A clause that says a prohibited assignment is void can stop the transfer from taking effect at all. A clause that merely says assignment without consent is a breach may leave the assignment effective and give only a damages claim. State law varies; some courts read anti-assignment clauses narrowly unless they clearly make a violation void.
- Assignment by operation of law. Whether a merger transfers a contract automatically, and whether that triggers the anti-assignment clause, is governed by state law and the merger structure (forward versus reverse triangular). The same clause can come out differently across states.
- Delegation of duties does not release the original party unless the contract provides a novation. Absent clear release language, the assigning party usually stays on the hook.
This is general information, not legal advice for a specific deal, and enforceability turns on the governing law and the deal structure. For an acquisition, review assignment and change of control language across every material contract during diligence; see our M&A due diligence legal workstream checklist.
Review checklist: red flags to catch
- Consent in "sole discretion" rather than "not unreasonably withheld."
- No affiliate or change of control carve-out, so a routine reorg or sale needs consent.
- No "void" remedy, leaving it unclear whether a prohibited assignment actually transfers.
- Reliance on anti-assignment alone to control acquisitions (often does not reach a stock sale).
- No assumption requirement, so an assignee could take the rights without the duties.
- No competitor exception when the real concern is who the assignee is.
- Silence on ongoing liability, leaving novation versus continuing liability ambiguous.
- One-sided successors-and-assigns language binding only one party.
How it interacts with other clauses
- Change of control: the partner clause; an acquisition is usually addressed as a deemed assignment, so the two must be read together.
- Termination: an unconsented assignment is often a breach that triggers the termination right.
- Survival: governs which obligations carry to a permitted assignee after transfer.
- Notices: assignment consents and notices run through the notice mechanics.
- Entire agreement: part of the boilerplate set; read the assignment clause alongside the other general provisions.
FAQ
What is an assignment clause? It is a contract provision that controls whether a party can transfer its rights and obligations to a third party, and on what terms. Most commercial contracts require the other party's consent before assignment, with carve-outs for affiliates and acquirers.
What does "not to be unreasonably withheld" mean? It means the counterparty cannot refuse consent to an assignment arbitrarily; a refusal has to be commercially reasonable, and an unjustified refusal can itself be a breach. It is the preferred middle ground between a sole-discretion veto and free assignment.
Does an anti-assignment clause stop an acquisition? Often not on its own. In a stock sale where the contracting entity survives, there is usually no assignment, so the clause may never engage. In a merger, treatment depends on the wording and state law. To control acquisitions, add an express change of control provision rather than relying on anti-assignment language.
What does "successors and assigns" mean? It confirms that the contract binds and benefits whoever properly steps into each party's shoes, including a permitted assignee or a successor entity. It is not a grant of the right to assign; it just ensures a valid assignment carries the contract with it.
If I assign a contract, am I still liable? Usually yes, unless the contract releases you through a novation. Delegating your duties to an assignee does not, by default, free you from them; the counterparty bargained for your performance, so you typically stay liable absent clear release language.
What is the difference between assignment and delegation? Assignment transfers your rights under the contract (such as the right to payment); delegation transfers your duties (such as the obligation to perform). Contracts often address both as "assignment," but rights are generally more freely transferable than duties.
Should a prohibited assignment be void or just a breach? From the counterparty's side, "void" is stronger: it can stop the transfer from taking effect at all. A clause that makes assignment without consent merely a breach may leave the assignment effective and give only a damages claim. Say "void" if you want to block the transfer itself.
Related clauses
Clauses that get negotiated alongside this one.
