Plenty of supply relationships run for years on purchase orders and email. They work right up until a consignment arrives late, or short, or wrong — and then it becomes clear that nobody agreed what happens next.
A vendor agreement is not bureaucracy. It is the document that decides, in advance and while both sides are still friendly, who bears which risk. Here is what it should settle.
Why the PO-only approach breaks
A purchase order says: supply this quantity, at this price, by this date. It does not say what quality standard applies, what happens if the goods fail inspection, whether the price can move, when risk in transit passes, or how either side exits.
Worse, the gap usually gets filled twice. The buyer's PO has terms printed on the back. The supplier's quotation and invoice have their own terms. Each says it prevails. This is the classic battle of the forms, and the answer to "whose terms apply?" is often genuinely unclear until a court or arbitrator decides — which is an expensive way to find out.
A signed vendor agreement resolves it: the agreement governs, POs handle only quantity, price, and delivery date, and any terms on a PO or invoice that conflict with the agreement have no effect. That single clause is worth the effort of putting an agreement in place.
Specifications: the part everyone underdocuments
"As per sample" is not a specification. Nor is a product name. Specifications should be an annexure, not a sentence, and should cover:
- Technical parameters with tolerances, not just target values.
- Materials, grades, and any restricted substances.
- Applicable standards or certifications, named specifically.
- Packaging, labelling, and marking requirements.
- Shelf life or expiry, where relevant.
- Documentation required with each consignment — test certificates, batch records, material certificates.
- Whether a retained reference sample governs, and who holds it.
Put the specification in an annexure that can be updated by agreement without reopening the whole contract, and say expressly that a change to the specification requires written agreement — not a verbal instruction to a production supervisor.
Price, and the revision clause that decides your margin
Set the price and the currency, state whether it is inclusive or exclusive of taxes and duties, and say who bears any change in statutory levies during the term.
Then handle revision properly, because this is where long-term supply contracts either hold or fail:
- A firm period during which price cannot change at all.
- Defined triggers for revision — a named input cost index, a documented raw material movement, or a fixed anniversary.
- Notice requirement before any increase takes effect, long enough for the buyer to plan or re-source.
- Evidence obligation on the supplier to substantiate the cost movement claimed.
- Caps per revision and per year.
- Buyer's option if the increase is unacceptable — usually a right to terminate without penalty on notice, which keeps the negotiation honest.
Also settle payment: credit period and when it starts, payment method, interest or charges on late payment, whether early-settlement discounts apply, and whether any security or advance is required. Suppliers should note that a credit period running from invoice date behaves very differently from one running from goods acceptance.
Delivery, title, and risk
Three separate questions, frequently collapsed into one and later regretted:
- Delivery — where, and what constitutes delivery. Lead time should run from a defined trigger such as receipt of a confirmed PO, not from an undefined moment.
- Title — when ownership passes. Suppliers often want title retained until payment in full; buyers financing inventory may want it earlier.
- Risk — when responsibility for loss or damage passes. This can differ from title, and for goods in transit it usually does.
For cross-border supply, an agreed trade term handles most of this efficiently — but name the specific rule and version rather than referring vaguely to trade terms. Also cover partial deliveries: are they permitted, and does a partial delivery trigger a proportionate payment obligation?
On timing, decide what late delivery actually costs. A stated liquidated damages figure per day, capped at a percentage of order value, is far more useful than a general right to claim damages nobody will quantify.
Inspection, rejection, and remedies
This is the clause that determines how a bad consignment gets resolved. Specify:
- Inspection window — how long after delivery the buyer has to inspect, and whether unexamined acceptance is deemed after that.
- Method — visual, sample-based, or full testing, and whose test result governs if the parties disagree.
- Non-conformity — defined against the specification, not against subjective expectation.
- Remedies — replacement, repair, price reduction, refund, or the right to procure substitutes at the supplier's cost. State which apply and in what order.
- Rejected goods — who collects them, who bears return freight, and what happens if the supplier does not collect within a stated period.
- Latent defects — a longer window for defects that could not reasonably have been found on inspection.
Where a third-party test is the tiebreaker, name the laboratory or the basis for selecting one now. Choosing an arbiter during a dispute rarely goes smoothly.
Warranties, liability, and indemnity
Supplier warranties normally cover conformity to specification, satisfactory quality, freedom from encumbrances, compliance with applicable law, and non-infringement of third-party IP. Set a warranty period and say what remedy a warranty breach attracts.
On liability, the same discipline applies as in any commercial contract: an aggregate cap proportionate to contract value, exclusion of indirect and consequential loss with loss of profit addressed expressly, and carve-outs for matters conventionally uncapped — IP infringement, confidentiality breach, personal injury, and wilful misconduct.
Indemnities deserve attention because they sit outside the cap if you draft them that way. Common ones: third-party IP claims arising from the goods, product liability claims, and claims arising from the supplier's breach of law. Buyers should ask for them; suppliers should check the scope is limited to their own acts rather than open-ended.
Where the relationship involves sharing designs, formulations, or customer data before the agreement is signed, put an NDA in place first — our NDA guide covers what it should say.
Compliance, audit, and subcontracting
Buyers increasingly need contractual hooks for obligations imposed on them further up the chain:
- Regulatory compliance — the supplier warrants compliance with applicable labour, environmental, and product safety law.
- Audit rights — reasonable access to premises and records on notice, with confidentiality protection for the supplier.
- Subcontracting — permitted or not, with or without consent, and the supplier remaining responsible for subcontractor performance either way.
- Traceability — batch records and documentation retention for a defined period.
- Business continuity — notification of events likely to affect supply, and whether alternative sourcing is permitted during a disruption.
Suppliers should not treat these as one-sided impositions. Clear, bounded compliance obligations are far better than vague ones that expand under pressure.
Exclusivity, volumes, and exit
Exclusivity works only when both sides commit. If the buyer wants exclusive supply, the supplier reasonably expects minimum volume commitments; if the supplier wants exclusive distribution, the buyer reasonably expects protected pricing. Define territory, duration, and consequences of breach, and avoid perpetual arrangements.
Volume commitments should distinguish between a forecast (non-binding planning information) and a commitment (binding, with consequences for shortfall). Blurring the two produces predictable arguments about capacity the supplier reserved and the buyer never used.
On exit, cover notice periods for termination for convenience, termination for cause with a cure period, treatment of open purchase orders at termination, whether the buyer must take committed inventory, tooling and equipment ownership, and any transition assistance while the buyer qualifies a replacement supplier.
Executing the agreement digitally
Vendor agreements are ordinary commercial contracts and are routinely signed electronically. On WeSignDeal, a vendor agreement follows the same workflow as other documents: enter both parties' details, upload supporting documents, issue a secure verification link to each signer where they complete a live selfie and identity document upload, handle stamp duty where the document type and jurisdiction require it — Government eStamp, or self-upload where that option is enabled for your case — and then collect eSign from every signer. The executed PDF carries the stamp certificate where applicable and a full audit trail behind it.
Two things to get right before you start. First, signatory authority: confirm the individual signing for each company is authorised to bind it, since this is the most common defect in company-to-company signing. Second, remember that fields lock once verification links are issued and payment is completed — so specifications, pricing, and delivery terms should be final at that point. How it works covers the sequence and Pricing shows the per-signer eSign cost.
Where the same supplier relationship generates repeated engagements rather than repeated goods orders, consider the framework approach described in our MSA and statement of work guide — the same logic applies.
Procurement checklist
- Agreement prevails over PO and invoice terms — stated expressly.
- Specification annexed with tolerances, standards, and required documentation.
- Price fixed for a firm period; revision triggers, notice, evidence, and caps defined.
- Payment terms with a defined credit-period start point.
- Delivery, title, and risk each addressed separately.
- Late delivery consequence quantified and capped.
- Inspection window, non-conformity definition, remedies, and latent defect period.
- Warranties with a stated period and remedy.
- Liability cap, exclusions, and indemnity carve-outs.
- Compliance warranties, audit rights, subcontracting position.
- Forecast versus commitment clearly distinguished.
- Termination, open orders, tooling, and transition assistance.
- Signatory authority verified for both companies.
Related reading
Start a vendor agreement, or browse every document type on Do Agreement Online.
General information only, not legal advice. WeSignDeal is a technology and document facilitation platform, not a law firm. Sale of goods law, liability limitations, and stamp duty treatment vary by jurisdiction — take professional advice on significant supply arrangements.
