Purchase order against sales contract
Most trade runs on purchase orders and never produces a signed contract. That works until something goes wrong, at which point whose terms apply becomes the entire question — and the answer is usually decided by which piece of paper moved last.
For repeat business on modest values, a purchase order carrying your terms is normally enough. For a first order with a new counterparty, high value, custom manufacturing, or anything with staged payments, put a sales contract in place — a purchase order and a sales confirmation carrying contradictory terms is a dispute waiting for a trigger.
| Purchase Order | Sales Contract | |
|---|---|---|
| Written by | The buyer. | Both, and signed by both. |
| Whose terms | The buyer's, if accepted as sent. | Negotiated. |
| Becomes binding | On the seller's acceptance. | On signature. |
| Covers | This order. | The relationship, often several orders. |
| Usually silent on | Governing law, disputes, force majeure. | Nothing important. |
The battle of the forms
The buyer sends a purchase order carrying their terms. The seller acknowledges with a sales confirmation carrying theirs. Both assume their own apply. Which set governs depends on jurisdiction and on the sequence of documents, and the honest summary is that nobody knows until a court decides. That is a bad position to discover after a shipment has been rejected.
What a purchase order should always state
The Incoterm with its named place, the payment terms, the delivery date, and what the goods actually are — specification, not just a part number. Those four decide most of what can go wrong. Sending a bare order with a price and a quantity means inheriting the supplier's terms on everything else.
The buyer's formal instruction to supply goods on stated terms, prices and delivery dates.
The agreement itself: goods, price, delivery terms, payment and the clauses both parties sign against.
+Is a purchase order legally binding?
It becomes binding when the seller accepts it, which they can do by confirming in writing or simply by shipping. Before acceptance it is an offer the buyer can withdraw.
+Do I need a contract for every order?
No. A framework sales contract signed once, with individual purchase orders under it, is the usual arrangement and avoids renegotiating terms per shipment.
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