The UCC 2-207 flow chart is a three-step decision tree for sorting out whether a contract exists when two businesses swap forms with mismatched terms, and if so, which terms govern. You ask first whether the response is a definite and seasonable acceptance, then whether that acceptance is expressly conditional on the new terms, and finally — if a contract has formed on paper — which of the added or conflicting terms survive. If the writings never produce a contract but the parties perform anyway, a separate subsection builds one out of their conduct.
First, Confirm Article 2 Governs
The flow chart only runs if UCC Article 2 applies, which means the transaction has to be a sale of goods — tangible, movable property like machinery, raw materials, or finished products.1Legal Information Institute. Uniform Commercial Code 2-102 – Scope; Certain Security and Other Transactions Excluded Service contracts, real estate deals, and intellectual property licenses sit outside Article 2 and stay under common law, where the old mirror image rule still forces acceptances to match offers exactly.2Legal Information Institute. Mirror Image Rule For hybrid deals that mix goods and services, most courts ask which purpose predominates.
Step 1: Is the Response a Definite and Seasonable Acceptance?
The first gate is Section 2-207(1). A response operates as an acceptance if it is a definite and seasonable expression of acceptance sent within a reasonable time, even when it carries terms that add to or differ from the offer.3Legal Information Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation “Definite” means the response shows genuine intent to close on the core terms — price, quantity, subject matter. “Seasonable” means it lands within a commercially reasonable window, not months later after the market has moved.
If the response is vague, non-committal, or arrives unreasonably late, it fails this gate. No contract forms under the writings, and you jump ahead to the conduct analysis in subsection (3). If the response clears the gate, move to the next question.
Step 2: Is the Acceptance Expressly Conditional on the New Terms?
Even a definite acceptance will not form a contract if the responding party makes it “expressly conditional on assent to the additional or different terms.”3Legal Information Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation That proviso flips the response from an acceptance into a counter-offer, and no contract exists until the original offeror specifically agrees to the new terms.
Courts set a high bar for this language. General grumbling about the offer, boilerplate like “subject to the terms on the reverse side,” or a disclaimer buried in fine print usually will not do it. The language has to make unmistakably clear that the responding party refuses to be bound unless the offeror accepts the changed terms. If the proviso is there, the analysis jumps to subsection (3). If not, a contract has formed, and the remaining question is which terms it contains.
Step 3: Which Terms Make It Into the Contract?
Once a contract exists under 2-207(1), the chart splits based on whether both parties qualify as merchants. A merchant is someone who regularly deals in goods of the kind involved or holds themselves out as having specialized knowledge of the trade. Two wholesalers negotiating a steel shipment are both merchants. A consumer buying an appliance from a retailer is not.
Between Merchants
Between merchants, additional terms in the acceptance fold into the contract automatically unless one of three exceptions applies.3Legal Information Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation This default reflects the reality that sophisticated commercial parties expect some paperwork variation and should not be able to dodge reasonable additions after the fact.
The three exceptions that keep additional terms out:
- The offer expressly limits acceptance to its own terms. A purchase order saying “acceptance is limited to the terms stated here” blocks additions in the response.3Legal Information Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation
- The addition materially alters the contract. A material alteration causes surprise or hardship if slipped in unnoticed. The Official Comments list examples: eliminating standard warranties, demanding 100% delivery in an industry where shortfalls are normal, giving the seller a right to cancel over any single late invoice, or imposing a complaints deadline far shorter than trade custom. An arbitration clause forcing travel to a distant forum fits too. Minor additions, like a different invoice format or a commercially reasonable force majeure clause, are less likely to count as material.4Open Casebook. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation
- The offeror objects within a reasonable time. Prompt notice that the new terms are unacceptable keeps them out. The UCC does not define a specific number of days, so trade customs and the pace of the deal set the window. Objecting as soon as you spot the term is the safest practice.3Legal Information Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation
If no exception applies, the additional term is in, whether the offeror noticed it or not. This is where merchants get burned: skimming a confirmation and letting the clock run means being bound by clauses nobody negotiated.
When One Party Is Not a Merchant
When a consumer or other non-merchant sits on one side, additional terms are mere proposals for addition to the contract.3Legal Information Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation They do not bind unless the non-merchant affirmatively agrees. Silence, taking delivery, or using the goods is not enough. The party pushing the new terms has to get clear, express consent.
The practical effect: if you are a consumer and a seller’s confirmation adds an arbitration clause you never discussed, that clause is a proposal you can ignore. The core deal on product and price stands; the unapproved additions fall away.
The “Different Terms” Wrinkle
Subsection (1) covers responses with terms “additional to or different from” the offer, but subsection (2) only mentions “additional” terms. So what happens when the acceptance directly contradicts the offer — a different warranty, a different delivery point — rather than just adding something new? Courts have split three ways.
- Different terms are a subset of additional terms. Subsection (2) governs both, and a conflicting term drops out if it materially alters the contract. The offeror’s original term stands.
- Different terms fall out entirely. Because subsection (2) only names “additional” terms, some courts hold it does not reach conflicting ones at all. The offeree’s contradictory term drops; the offeror’s term controls.
- The knock-out rule. Both sides’ conflicting terms cancel each other, and the gap gets filled by the UCC’s default provisions.
There is no uniform national answer. Which approach your jurisdiction follows can change who wins, so pin down the local rule whenever the forms contain terms that clash head-on rather than simply adding new ones.
Step 4: Contract by Conduct Under 2-207(3)
When the writings fail — either because the acceptance was expressly conditional or because the forms are too far apart to count as a definite acceptance — the deal is not necessarily dead. If both parties perform anyway, with the seller shipping and the buyer accepting the goods, Section 2-207(3) recognizes a contract based on that conduct.3Legal Information Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation
The terms of a conduct-based contract are only those on which the writings agree. Every clause the forms disagree on gets knocked out, and the resulting gaps are filled by the UCC’s supplementary defaults — place of delivery, time for payment, open price, implied warranties of merchantability and fitness, and so on.5Legal Information Institute. Uniform Commercial Code – Article 2 – Sales If the forms disagreed on delivery location, for example, the UCC default puts delivery at the seller’s place of business.
This is the true knock-out rule in action, and it often produces results neither party expected. An aggressive arbitration clause in one form and a jury-trial clause in the other both vanish, replaced by whatever the code provides. Parties who count on performance to lock in their deal often end up with a contract shaped more by the UCC’s defaults than by anything either side drafted.
Written Confirmations of Oral Deals
The flow chart does not only cover the classic purchase-order exchange. It also runs when a party sends a written confirmation after the parties have already struck a deal orally, by phone or in person. A merchant’s written confirmation operates as an acceptance under 2-207(1) even if it includes terms the parties never discussed on the call.3Legal Information Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation
Those added terms then run the same gauntlet: between merchants, they come in unless one of the three exceptions applies; with a non-merchant on the other side, they are proposals only. The party sending a confirmation has a strong incentive to load it with favorable terms, so reviewing confirmations closely and objecting quickly matters just as much as reviewing an initial acceptance.
Drafting Moves That Control the Outcome
Knowing the flow chart helps resolve disputes after the fact. The real value is structuring your forms to control outcomes before a dispute starts.
- If you send the offer, limit acceptance to your terms. Language like “this offer expressly limits acceptance to the terms stated herein” triggers the exception under 2-207(2)(a) and blocks the other side’s additions.3Legal Information Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation
- If you respond and want your terms to control, use expressly conditional language. Making your acceptance “expressly conditional on assent to the additional or different terms” stops a contract from forming under 2-207(1) and forces a negotiation. One warning: if both sides then perform, you drop into 2-207(3), where the knock-out rule may erase your carefully drafted terms along with the offeror’s.
- Object to unwanted terms immediately. A timely objection under 2-207(2)(c) keeps added terms out of a merchant-to-merchant contract. Do not assume you can raise the issue later. Build a review process that flags problematic clauses in incoming confirmations as soon as they arrive.
- Do not rely on performance to protect your position. A conduct-based contract swaps every conflicting clause for a UCC default. If your business depends on a specific warranty disclaimer, a liability cap, or a dispute-resolution clause, that term needs to appear in both parties’ writings or in a separately signed document.
The parties who lose under 2-207 are almost always the ones who treated their forms as a formality and never read what came back. In fast-moving commercial relationships, that inattention can mean discovering after a dispute that the arbitration clause, the damages cap, or the warranty disclaimer was never part of the contract at all.