Assignment clause: what it means and how to draft it

What an assignment clause does

An assignment clause sets the rules for handing a contract, or parts of it, to someone who was not an original party. It covers two related moves that drafters often blur together. Assignment is the transfer of a party’s rights under the contract, such as the right to be paid or the right to receive services, to a new holder called the assignee. Delegation is the transfer of a party’s duties, such as the obligation to perform the work, to someone else who will carry them out. A clause labeled simply “Assignment” usually reaches both, and in practice it is also where the parties address change of control, meaning what happens to the contract when one side is bought or merged.

The clause matters because the default rule often surprises people. Under general US contract law, and under the Uniform Commercial Code for the sale of goods, contract rights are freely assignable and duties freely delegable unless the contract says otherwise, or unless the transfer would materially change the other party’s risk or burden. In other words, silence favors free transfer. If you want to keep control over who ends up on the other side of your deal, the assignment clause is where you say so.

A well built clause answers four questions. May a party assign at all, or only with consent? Does the same rule apply to delegating duties as to assigning rights? Are there exceptions, such as transfers to an affiliate or in a sale of the business? And what is the consequence of a transfer made in breach: is it simply a breach that sounds in damages, or is the purported assignment void and of no effect? The wording that answers that last question does most of the work.

Drafting example

Assignment. Neither party may assign or transfer this Agreement, or any of its rights or obligations under it, whether voluntarily, by operation of law, or otherwise, without the prior written consent of the other party, which consent shall not be unreasonably withheld or delayed. Notwithstanding the foregoing, either party may assign this Agreement in its entirety, without consent, to an affiliate or to a successor in connection with a merger, acquisition, corporate reorganization, or sale of all or substantially all of its assets, provided the assignee assumes in writing all obligations under this Agreement. Any purported assignment in violation of this Section is void. This Agreement binds and benefits the parties and their respective permitted successors and assigns.

The first sentence sets the baseline: no transfer without consent, and it reaches both rights and obligations so a party cannot offload its duties while claiming it only assigned a right. The “not be unreasonably withheld” language keeps the consent right from becoming an absolute veto that blocks legitimate business moves. The second sentence is the pressure valve: it carves out affiliates and genuine sale-of-business transactions, which most parties accept, while requiring the assignee to assume the obligations so performance does not fall through a gap. The third sentence is the one drafters most often omit and most need, because it makes a prohibited assignment void rather than merely wrongful. The final sentence ties the clause to the successors-and-assigns language, so the permitted transfers actually bind the newcomers.

What US law says

US law generally starts from freedom of transfer and then honors the parties’ choice to restrict it, but the details vary by state and by contract type. For the sale of goods, UCC Section 2-210 codifies the default that rights are assignable and duties delegable unless the assignment would materially change the duty, increase the burden or risk on the other party, or impair the chance of return performance. Personal-services contracts and other agreements that depend on a particular party’s skill or trust are the classic exception, where duties usually cannot be delegated without consent.

The most consequential rule concerns the effect of an anti-assignment clause. Many courts distinguish between a clause that removes the right to assign, which makes a transfer a breach giving rise to damages, and a clause that removes the power to assign, which makes the transfer itself void. Under the Restatement (Second) of Contracts, a bare promise not to assign is often read as a mere covenant, so an assignment made in breach can still be effective and leave the non-assigning party with only a damages claim. To actually invalidate the transfer, the clause must say clearly that any purported assignment in violation is void. That single phrase is why the drafting example includes it.

Change of control adds another layer. Whether a merger or acquisition trips an anti-assignment clause depends on both the deal structure and the exact wording. Courts have reached different results on whether a stock sale, an asset sale, or a reverse triangular merger counts as an assignment by operation of law, and Delaware authority in particular has treated some reverse triangular mergers as not constituting an assignment. If protecting against a change in ownership is the real goal, the clause should say so expressly rather than relying on the general word “assign.” Separately, the UCC can override contractual anti-assignment restrictions in some financing contexts, for example the assignment of accounts receivable, so a clause that appears airtight may not stop a security interest.

Common mistakes to avoid

The first and most common mistake is relying on a bare prohibition without the void language. A clause that says the contract “may not be assigned” but stops there may leave you with nothing more than a damages claim after the transfer has already happened, when what you wanted was to prevent it.

A second mistake is addressing rights but forgetting duties. Assigning the right to payment is very different from delegating the obligation to perform, and a clause that covers only “rights” can let a counterparty hand off the hard work while you keep dealing with a party you never chose. Unless there is a novation, the original party usually remains liable for performance even after a permitted delegation, and the clause should make that survival explicit.

A third mistake is drafting a consent right with no carve-outs. An absolute no-assignment rule can freeze ordinary corporate life, blocking a routine reorganization or an internal transfer to an affiliate, and it can become a bargaining chip the other side uses to reprice the deal during a merger. The fix is a narrow, well defined exception for affiliates and genuine sale-of-business transactions, paired with a requirement that the assignee assume the obligations.

A fourth mistake is inconsistency with the rest of the contract. A tight anti-assignment clause sitting next to a broad successors-and-assigns clause, or a definitions section that sweeps affiliates into the meaning of a party, can send mixed signals a court will have to untangle. Align the assignment clause with the change-of-control, governing-law, and boilerplate provisions so they read as one coherent instruction.

Finally, drafters often ignore the financing override. If your counterparty may factor its receivables or grant a security interest, understand that the UCC may let those assignments through despite your clause, and plan for that rather than being surprised.

When it matters most

Assignment clauses earn their keep at the two moments when who holds the contract suddenly changes: a sale of the business and a shift in strategic relationships. In mergers and acquisitions, buyers run diligence across the target’s contracts precisely to find anti-assignment and change-of-control provisions, because each one can require a third-party consent that delays closing, hands a counterparty leverage, or even ends a term the buyer was counting on. A portfolio full of restrictive assignment clauses can slow or reprice a deal.

They also matter most in long-term and dependency-heavy relationships: exclusive supply arrangements, technology and IP licenses, key customer accounts, and outsourcing deals where the identity and reliability of the performing party is central to the bargain. In those contracts, being handed a new, unknown, or less creditworthy counterparty is a real risk, and the assignment clause is the only place that risk is controlled in advance. The same is true in financing, where the ability, or inability, to assign receivables can determine whether a company can raise money against its contracts.

An assignment clause is quiet during normal performance and decisive the moment ownership or strategy shifts. That is exactly why it rewards disciplined contract management rather than one-off drafting. Consent rights, change-of-control triggers, and carve-outs only protect you if you can find them across every agreement, read them consistently, and act on them before a deadline passes. A CLM platform like Pactolane helps by keeping every executed contract in one repository, using PactAI to extract assignment and change-of-control terms into a plain-language executive summary, flagging with compliance playbooks the agreements whose language falls short of your standard, and detecting conflicts where one contract’s transfer permission collides with another’s restriction. PactAI prepares and highlights; your counsel decides how each clause should read and whether consent is required. This is general legal information, not legal advice.