Most Favoured Customer Clauses: What They Mean in Ontario Supply and Pricing Agreements

If you buy a meaningful volume of goods or services from one supplier, you have probably heard someone suggest asking for a most favoured customer clause — sometimes called a most-favoured-nation or "MFN" clause. It sounds like a guarantee that you will always get the best deal in town. In practice, it is narrower than that, and how it is drafted determines whether it actually protects you or just reads well.

This article explains what a most favoured customer clause does, what it typically leaves out, and what to check before you rely on one in an Ontario supply or pricing agreement.

What a Most Favoured Customer Clause Actually Promises

At its core, a most favoured customer (MFC) clause is a promise from a supplier that a particular buyer will receive pricing, discounts, or terms that are at least as good as those the supplier offers to other, comparable customers. If the supplier later gives someone else a better rate, the clause requires the supplier to extend that same rate to the buyer holding the MFC clause.

These clauses show up most often in:

• Long-term supply agreements where a buyer commits to significant volume.
• Distribution and reseller agreements.
• Software and SaaS contracts where a large customer wants pricing parity with future customers.
• Licensing arrangements between businesses of unequal bargaining power.

The appeal is obvious: the buyer gets some assurance that its negotiating effort today will not be undercut by a better deal the supplier quietly gives someone else tomorrow.

Why the Clause Is Narrower Than It Sounds

A most favoured customer clause is only as strong as its definitions. Three drafting choices tend to make the biggest practical difference.

1. What counts as a "comparable" customer

Most clauses only require price parity with customers who are similarly situated — comparable volume, comparable contract length, comparable risk profile. A supplier can usually still offer a better price to a much larger customer, or to one that pays upfront, without triggering the clause. If the comparability standard is vague, disputes tend to follow.

2. What counts as "pricing"

A narrowly drafted clause might cover only the headline price per unit, while ignoring rebates, marketing credits, extended payment terms, or bundled free services that functionally lower the effective price for someone else. A buyer relying on an MFC clause should think about whether it captures the whole economic package, not just the sticker price.

3. How and when it is enforced

Some clauses are self-executing (the better price applies automatically once the supplier grants it elsewhere). Others require the buyer to request an adjustment, sometimes within a defined window. Some require the supplier to proactively disclose better terms it has given others — which is difficult to verify and rarely happens without a dispute forcing the issue.

What Suppliers Typically Push Back On

Suppliers are often reluctant to grant broad MFC clauses, and for good reason from their side:

• Administrative burden. Tracking every customer's terms against every MFC commitment across a whole customer base is genuinely difficult.
• Loss of pricing flexibility. A supplier may want to offer a promotional or introductory rate to win new business without being forced to extend it to existing large accounts.
• Confidentiality conflicts. Comparing terms across customers can require disclosing information that other customers expect to stay confidential.

Because of this, suppliers frequently negotiate carve-outs: promotional pricing, one-time introductory discounts, government or non-profit pricing, and bundled deals are common exclusions from an MFC obligation.

Checklist: What to Look for Before Relying on the Clause

• [ ] Does the clause define "comparable customer" with enough specificity to actually be enforceable?
• [ ] Does "pricing" or "terms" clearly include discounts, rebates, credits, and non-price concessions — not just the headline rate?
• [ ] Is there a defined mechanism for finding out about better terms (disclosure obligation, audit right, or periodic certification)?
• [ ] Is the adjustment automatic, or does the buyer have to request it — and is there a time limit?
• [ ] What carve-outs exist (promotions, one-off deals, different product lines, different markets)?
• [ ] Does the clause survive if the contract is later amended or renewed, or does it need to be re-negotiated?

Enforcement in Practice

If a supplier breaches a most favoured customer clause, the usual remedy is a claim for damages — the difference between what the buyer paid and what it should have paid under the better terms — rather than an order forcing the supplier to keep supplying at a specific price going forward. As with any contract dispute, the buyer would generally need to bring a claim within Ontario's basic limitation period, which runs from when the breach is discovered rather than from the date of the contract itself; exact deadlines can vary by claim type, so it is worth checking with a lawyer promptly if you believe a clause has been breached.

In practice, most disputes over these clauses are resolved commercially — a buyer that discovers better pricing elsewhere typically raises it directly with the supplier and negotiates an adjustment, since litigating over a pricing formula is expensive relative to what is usually at stake.

Frequently asked questions