How to negotiate with a supplier who doesn't speak English

For contract negotiation, use a human interpreter — the judgement matters more than the words. For routine commercial calls, AI translation with a glossary of your terms works, provided every number and commitment is confirmed in writing afterwards.

Procurement across a language barrier has a specific asymmetry: ambiguity almost always resolves in favour of whoever wrote the document. Everything below is about removing ambiguity rather than about translation quality.

Use a human interpreter for the negotiation itself

Terms, pricing structure, liability, penalties, termination. These are the conversations where a phrase that could be read two ways will be read the profitable way later.

An interpreter does something an algorithm does not: hears an ambiguity and resolves it, or flags it. They also read hesitation, which in a negotiation is information.

Brief them properly — the draft contract, a glossary of your commercial terms, and the outcomes you need. An interpreter who knows what you are trying to achieve will tell you when the other side’s answer was evasive rather than merely translating the evasion.

Use AI translation for the routine calls

Production status, quality issues, delivery scheduling, the fortnightly check-in. These calls currently happen in approximate English or through whoever on the supplier’s side speaks it best — which is frequently a sales contact rather than the person who knows the answer.

Getting the production manager into the conversation in their own language is often worth more than the translation quality itself.

Load a glossary first. Business terms are exactly where general translation fails: purchase order, lead time, backorder, minimum order quantity, net thirty, incoterms. These have specific meanings that diverge from the everyday sense of the same words, and a wrong rendering is expensive rather than embarrassing.

Rules for the call itself

1. Every number is spoken and typed. Quantities, unit prices, currencies, dates, tolerances. No exceptions.
2. Confirm commitments by restatement. “To confirm: twelve thousand units, four euros eighty each, delivered by the fifteenth of March.” Then type it.
3. Never accept a nod. Ask them to state the commitment back in their own words. In several business cultures, disagreeing directly with a customer is impolite, and you will get agreement that is not agreement.
4. Ask what would make the date slip. A supplier who cannot answer that has not planned it.
5. Written summary within the hour, in both languages, sent to everyone on the call.

Where it goes wrong

Assuming silence is agreement. It is frequently the opposite, expressed in a register you are not reading.

Negotiating through the supplier’s English speaker. You are then negotiating with an interpreter who works for the other side and has their own view of the outcome.

Leaving specifications in one language. If the drawing, the specification and the acceptance criteria exist only in your language, every deviation becomes a translation argument.

Platform note

Supplier calls are external, and often involve people without corporate conferencing licences. Teams Interpreter excludes external guests and anonymous users and requires Microsoft 365 Copilot. Google Meet handles one English-anchored pair per meeting, so a call with a supplier’s Chinese-speaking production team and your Spanish-speaking quality lead is outside it. Zoom gives captions only.