A purchase order is not an agreement
Plenty of substantial trading relationships run for years on purchase orders alone, and it works right up until it doesn't. A purchase order says what you want, how many, and when. It is silent on almost everything that goes wrong: who pays for a batch that fails inspection three weeks after acceptance, whether the supplier may raise prices mid-term, what happens to your tooling if they enter insolvency, and whether they may sell the same custom part to your competitor.
Worse, purchase orders and supplier acknowledgements usually carry conflicting standard terms on their reverse. Each party assumes their own applied. The resulting dispute about which document governs is expensive and entirely avoidable.
The provisions that carry real money
Specification and acceptance
The agreement should point at a specification document by name, revision number and date — not describe the goods in prose. Then answer the harder question: how does a delivery become accepted? Set an inspection window (commonly five to fifteen business days), say what happens to goods that fail it, and state explicitly that payment does not constitute acceptance. Without that last sentence, an automated payment run can waive your rejection rights.
Price and price adjustment
Fixed prices for the whole term are clean but tend to produce a supplier who quietly stops prioritising you when their input costs move. Better to state a firm price for a defined period and then a mechanism: adjustments tied to a published index, capped per period, with a stated notice requirement and a right to review if the change exceeds a threshold. A mechanism you both understand beats an argument you both dread.
| Structure | Trade-off |
|---|---|
| Firm fixed | Budget certainty; supplier prices their risk into the number and resists volume growth if inputs move against them. |
| Indexed | Fair to both sides and transparent; you carry input volatility and need a credible published index that actually tracks their cost base. |
| Open book | Best alignment on genuinely strategic items; demands real effort and trust, and is not worth it for commodity purchases. |
A mechanism you both understand beats an argument you both dread.
Delivery, title and risk
Name an Incoterm and a version, because they are revised. Then be explicit about the three things the Incoterm does not settle for you: when title passes, who insures goods in transit, and what a late delivery entitles you to. “Time is of the essence” is a specific legal signal in some jurisdictions rather than a figure of speech — use it deliberately or not at all.
Warranty and remedies
State the warranty period, when it starts, and precisely what the supplier must do when goods fail: repair, replace, refund, or your choice among them. Then address the expensive part — consequential loss. If a failed component halts your line, is the supplier liable for your lost production, or only for the component? Most suppliers will exclude consequential loss and cap liability at fees paid over some period. That may be entirely reasonable, but it should be a decision you made rather than a clause you skimmed.
Term, renewal and exit
Auto-renewal with a short notice window is the clause most likely to trap you. If the agreement renews for twelve months unless cancelled sixty days out, put that date in a calendar the day you sign. Include termination for convenience with honest notice — the length should reflect real requalification time, not a round number — and settle in advance what happens to work in progress, raw material bought against your forecast, tooling you paid for, and your data.
Commonly forgotten
An exit-assistance clause. If you leave, the supplier agrees to continue supplying at the contract price for a defined transition period and to hand over specifications, tooling and quality records. Negotiating this after you have announced your departure is not a negotiation.
The provisions buyers leave out
- Change of control. Your supplier is acquired by a competitor. Do you get a right to terminate, or do you now buy a critical input from a rival?
- Subcontracting and disclosure of sub-tier suppliers. You audited them. Did you audit the firm actually making the part?
- Capacity commitment. A binding minimum they will hold for you, so that a larger customer arriving does not quietly push you down the queue.
- Business continuity. An obligation to hold safety stock, maintain a documented recovery plan, or qualify a second production site.
- Records and audit. A right to inspect quality records and, where cost is indexed or open book, the cost data behind an increase.
- Insolvency and tooling. Explicit ownership of tooling and moulds, marked as yours, with a right to collect them.
Proportion matters
Not every supplier needs a forty-page agreement. Match the instrument to the exposure: a short signed terms sheet for routine repeat purchases, a full agreement for anything strategic, custom, regulated, or hard to replace. The test is not annual spend alone but how much damage a failure would do. A $30,000 supplier of the one component with a nine-month requalification time deserves more paper than a $400,000 supplier of something you can buy from four other firms by Friday.
Reading this alongside the rest
The performance standards in the agreement should be the same ones on your vendor scorecard — a contract promising 98% on-time delivery while your scorecard measures something else is two documents describing two different relationships. Payment mechanics belong here too rather than in an email, which is the argument made in negotiating supplier payment terms. And the continuity clauses above are where a single-source exposure gets partially bought down, though never eliminated by paperwork alone.
General commercial information, not legal advice. Contract law varies by jurisdiction and by the goods involved; have a qualified lawyer review any agreement before you sign it.