My Vendor Breached Our Supply Contract (Missouri)

The one thing you cannot do is sit quietly and stew. The UCC rewards the buyer who gives prompt notice and moves to limit the damage, and it quietly strips remedies from the buyer who waits. So this guide is about moving deliberately — read your contract, document the breach, give written notice fast, cover your shortfall, and only then decide whether to sue.

First, figure out whether this is a goods or services contract

Before you do anything else, classify the deal — because it changes both your remedies and your deadline.

• Goods contracts run on the UCC. If your vendor supplies physical product — raw materials, inventory, parts, equipment — the contract is a sale of goods under Missouri's UCC, Chapter 400, and the buyer remedies below apply.
• Services contracts run on common law. If the vendor mainly provides labor or a service, the UCC's cover and rejection rules don't apply; you're under general Missouri contract law instead.
• Mixed contracts turn on the "predominant purpose." A deal that bundles goods and installation, for example, is treated as one or the other based on which dominates. When it's genuinely unclear, get advice before you rely on a UCC-only remedy.

This matters for the clock, too. A sale-of-goods claim has a four-year statute of limitations under UCC § 400.2-725. A written contract that isn't a sale of goods generally falls under RSMo § 516.110. Don't assume the deadline is the same for both.

Read the contract before you make a move

Your supply agreement almost certainly changes the default rules. Pull it out and read it closely before you send anything.

• Delivery terms. What exactly was promised — quantity, quality, specifications, and the delivery date? A "time is of the essence" clause makes a late delivery a clear breach.
• Cure rights. Many contracts give the seller a chance to fix or replace a nonconforming shipment. If yours does, you may have to allow that cure before pursuing other remedies.
• Force majeure. A force majeure clause may excuse the vendor if the failure was caused by an event the contract puts outside their control. Read it to see whether the excuse actually fits what happened.
• Limitation-of-remedies and disclaimers. This is the big one. Supply contracts routinely cap your recovery, disclaim consequential damages, or limit you to "repair or replace." Missouri generally enforces these clauses between businesses, so know your ceiling before you count on a number.

Give written notice of the breach — fast

This is the step buyers skip, and it's the one that sinks claims. Under UCC § 400.2-607, once you've accepted goods, you must notify the seller of the breach within a reasonable time after you discover (or should have discovered) it — or you are barred from any remedy for that breach.

• Put it in writing and date it. A short, dated letter or email stating what was wrong — late, short, or nonconforming — preserves your rights and starts a clean record.
• Be specific. Identify the order, the defect or shortfall, and the date you discovered it. Vagueness invites a fight later about whether you really gave notice.
• Send it promptly. "Reasonable time" is judged by the circumstances, but waiting weeks while you decide what to do is a gift to your vendor's lawyer. Send the notice, then figure out your next step.

If you haven't accepted the goods yet — they just arrived nonconforming — you also have the right to reject them. If you already accepted before discovering a substantial defect, you may be able to revoke acceptance if the nonconformity substantially impairs their value to you.

Cover your shortfall, then count your damages

Missouri's UCC expects you to limit the damage, and it gives you a clean way to do it. Your core remedies as a buyer are:

• Cover (UCC § 400.2-712). This is usually your best move. Buy substitute goods elsewhere in good faith and without unreasonable delay, then recover the difference between what you paid to cover and the contract price, plus incidental and consequential damages. Cover both replaces your supply and fixes your damages number.
• Market-price damages (UCC § 400.2-713). If you don't cover, you can instead recover the difference between the market price when you learned of the breach and the contract price. This is the fallback when covering isn't practical.
• Incidental damages. The reasonable costs the breach forced on you — extra freight, inspection, handling, or the expense of arranging substitute goods.
• Consequential damages. Foreseeable losses beyond the goods themselves, such as lost profits or downstream liability — if the vendor had reason to know of them and the contract didn't disclaim them.

Document every dollar. Keep the cover invoices, the price comparisons, the freight bills, and any record of orders you lost. Those contemporaneous documents are what prove your damages.

Demand performance or a cure, then decide whether to sue

With notice sent and your supply protected, you can take a measured next step instead of jumping straight to court.

• Demand performance or a cure in writing. If the relationship is worth keeping, give the vendor a firm written deadline to deliver conforming goods. Many breaches get resolved here.
• Negotiate or mediate. A clear demand setting out the breach and your covered cost often produces a settlement, especially with an ongoing supplier you'd rather not lose.
• Sue if you must. If the vendor won't make you whole, you can file suit — but remember the four-year UCC clock under UCC § 400.2-725 is running, so don't let the matter drift. Bring your contract, your dated notice, your cover invoices, and your damages records.
• Mind the contract's fine print. Arbitration, forum-selection, and choice-of-law clauses in your supply agreement may dictate where and how you can pursue the claim.

Frequently Asked Questions