Purchase Orders and Purchase Agreements: Which Governs When They Conflict
Akash Kore
· Founder & Product Architect· 3 min read
Two documents govern most B2B supply: a framework agreement negotiated once, and purchase orders issued routinely with their own terms on the back. When they conflict, which wins is decided by a clause almost nobody checks.
- ✓A purchase order is an offer, accepted by performance or acknowledgement.
- ✓Where a master agreement exists, it should expressly override PO terms.
- ✓Conflicting standard terms produce the classic battle of the forms.
- ✓An order of precedence clause resolves it in advance.
The legal character of a PO
A purchase order is an offer to buy on stated terms. It becomes a contract on acceptance, which may be express — an acknowledgement — or implied by performance, such as shipping the goods.
Where the supplier responds with its own terms, that is a counter-offer rather than an acceptance, and performance thereafter may be taken as acceptance of whichever terms were last sent. This is the battle of the forms, and it is resolved unpredictably.
Order of precedence
A master agreement should state expressly that its terms prevail over any terms in a purchase order, invoice, acknowledgement or other document, and that nothing in such documents varies the agreement regardless of signature.
Without that clause, the parties are relying on common law rules about offer and acceptance to resolve a conflict they could have decided in advance in one sentence.
What a PO should still carry
A PO that references the master agreement and carries commercial detail only is cleaner than one carrying four pages of terms that contradict it.
- A reference to the governing master agreement, by name and date.
- Item description, quantity, unit price and total.
- Delivery date and location.
- Payment terms consistent with the master agreement.
- The PO number itself, which the supplier must quote on every invoice.
Practical consequences for suppliers
If you receive a PO with terms that differ from what you negotiated, object before performing. Once you ship, the argument that you never accepted those terms becomes considerably harder.
Where your acknowledgement carries your own terms, send it before performance and keep the record. The sequence of documents is what a court will reconstruct.
Frequently asked questions
### Is a purchase order a contract?
It is an offer that becomes a contract on acceptance, which may be express or implied by performance. A PO alone, unaccepted, is not binding, though shipping against it generally constitutes acceptance.
### What happens when PO terms conflict with the agreement?
Without an order of precedence clause, the outcome depends on the sequence of documents and when performance occurred — the battle of the forms. A master agreement stating that its terms prevail over all PO terms resolves it in advance.
### Should a supplier object to unfavourable PO terms?
Yes, and before performing. Once goods are shipped or services begun, arguing that the PO terms were never accepted becomes difficult. An objection sent before performance preserves the position.
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Frequently Asked Questions
Is a purchase order a contract?
It is an offer that becomes a contract on acceptance, which may be express or implied by performance. A PO alone, unaccepted, is not binding, though shipping against it generally constitutes acceptance.
What happens when PO terms conflict with the agreement?
Without an order of precedence clause, the outcome depends on the sequence of documents and when performance occurred — the battle of the forms. A master agreement stating that its terms prevail over all PO terms resolves it in advance.
Should a supplier object to unfavourable PO terms?
Yes, and before performing. Once goods are shipped or services begun, arguing that the PO terms were never accepted becomes difficult. An objection sent before performance preserves the position.
Akash Kore
Founder & Product ArchitectArchitecting business document operating systems and automated billing workflows for Indian SMBs, agencies, and enterprises.