MFN is a price floor only if it bites.

What MFN is supposed to do.

A most favored nation clause is a price protection mechanism. The seller agrees that if the seller provides the same service to any other party at a lower rate, the buyer gets that rate too. The promise is straightforward in concept. In a TSA context, the clause is meant to prevent the seller from offering a cheaper deal to another divested business or to a third party, while charging the buyer the higher rate from the original TSA.

MFN matters more than it might appear at first. The seller in a typical carve-out has been through one or more prior divestitures, has live TSAs with other buyers, and may divest additional businesses during the term of the current TSA. The seller's internal pricing committee benchmarks the new TSA against the existing portfolio. Without MFN, the seller can quote higher to a new buyer with weaker leverage and still hold the price even after that benchmark moves.

The buyer's interest in MFN is partly economic and partly structural. The economic value is the dollars saved when a cheaper rate becomes available. The structural value is the discipline imposed on the seller's pricing committee. A seller that knows pricing concessions to one buyer cascade to all buyers tends to hold the line on the original price rather than discount selectively. MFN is the mechanism that creates that discipline.

In practice, MFN clauses appear in roughly half of mid-market TSAs and a higher percentage of large-cap TSAs. The clause is more often present than effective. The difference between presence and effect is the precision of the language, which is what the rest of this article addresses. For broader pricing context, see TSA pricing models explained.

Where the language fails the buyer.

The first failure mode is the comparable scope test. The seller's draft typically requires the comparable service to be substantially identical in scope, volume, and term before MFN applies. In practice, no two TSAs are identical. The seller can always identify some difference that disqualifies the comparable. The clause has the form of MFN without the function.

The second failure mode is the affiliate carve-out. The seller's draft excludes pricing offered to affiliates, subsidiaries, joint ventures, or successors of the seller. The carve-out is sensible in principle. In practice, the seller can structure favorable terms to flow through an affiliate vehicle and avoid triggering MFN. The carve-out should be narrowed to genuine affiliate relationships that predate the TSA.

The third failure mode is the disclosure obligation. MFN is meaningful only if the buyer knows when a cheaper rate has been offered. The seller's draft typically imposes no disclosure obligation. The buyer learns about the cheaper rate by accident or never. Without a disclosure mechanism, the clause is enforceable only when the buyer can prove what the buyer is not in a position to know.

The fourth failure mode is the credit mechanism. When the buyer does identify a cheaper comparable, the seller's draft typically requires the buyer to invoke the clause, the seller to verify, and the parties to agree on the application. Each of those steps creates friction. The clause should provide that when MFN triggers, the buyer's price adjusts automatically, retroactive to the date of the cheaper rate, and the seller credits the difference on the next invoice. The mechanism for surfacing pricing overcharges is detailed in TSA overcharge identification.

Drafting language that holds.

An MFN clause that holds has five components. A scope test based on service category rather than full identity. A narrow affiliate carve-out. A defined disclosure obligation on the seller. An automatic credit mechanism. A defined survival period that runs through the TSA term plus a tail.

The scope test should reference service category rather than substantial identity. If the seller provides finance shared services to another buyer at a lower rate, the buyer gets that rate for the same service category. Differences in volume can be addressed by comparing the rate per unit. Differences in term can be addressed by annualized rate. The test should be a calculation the buyer can perform, not a judgment the seller controls.

The disclosure obligation is the operational anchor. The seller should be required to certify quarterly that no comparable lower rate exists in the seller's portfolio. The certification should be signed by an officer of the seller. If a comparable lower rate does exist, the certification should disclose it and identify the affected service. The mechanism converts MFN from a theoretical right into a routine operating practice.

The automatic credit mechanism removes friction from enforcement. When MFN triggers, the buyer's invoice for the next period reflects the new rate. The seller applies a credit retroactive to the date the cheaper rate became effective in the other arrangement. The buyer does not have to claim. The seller does not have to agree. The mechanism operates as a contractual default. The audit discipline that supports this is in TSA audit rights.

What sellers actually concede.

Sellers concede a real MFN clause more often than they concede a real audit right or a real termination right. The reason is internal. The seller's deal team negotiating the TSA does not have visibility into future divestitures and rarely faces the personal cost of an MFN clause that triggers two years later. The clause is conceded because the immediate friction in negotiation is low. The future cost is borne by a different team.

That asymmetry is useful to the buyer. MFN is a clause the seller's deal team has a reason to give. The buyer's negotiating posture should make the give easy. Request specific language. Show that the language has been used in comparable transactions. Avoid characterizing the clause as confrontational. The clause is administrative protection, not an accusation.

Where sellers do push back, they push on the disclosure obligation and the affiliate carve-out. The disclosure obligation is operationally meaningful for the seller's portfolio team. The affiliate carve-out preserves flexibility for future internal transactions. A common compromise is quarterly disclosure with affiliate carve-out narrowed to relationships in place at the time of TSA signing. That compromise produces a clause that holds.

The credit mechanism rarely gets pushback once disclosure is conceded. The seller views automatic credit as a fairness backstop to the disclosure obligation rather than an independent give. The mechanics flow once the principle is agreed. The result is a clause that operates rather than a clause that exists.

When MFN actually triggers.

MFN triggers more often than buyers expect. Sellers active in carve-out programs run multiple divestitures within an 18 to 24 month window. Each new transaction sets a new TSA price. The seller's pricing has moved by the time the second or third deal closes. If the new price is below the first buyer's price, MFN triggers and credits flow.

MFN also triggers when the seller's pricing methodology changes. A seller that moves from cost-plus to fixed fee in the second divestiture may produce a lower rate on identical services. The first buyer's MFN clause captures that movement. The clause has produced material credit when sellers have repriced enterprise services for strategic reasons.

The buyer should expect MFN to produce two to four credit events over the life of a TSA in an active seller portfolio. The total value varies by category. On shared services TSAs with quarterly review, the recovery typically runs 2 to 5 percent of total TSA value. On simpler arrangements, the value is smaller. The cumulative effect is meaningful enough to justify the negotiation effort at pre-signing.

The buyer should also operate the clause actively rather than passively. The quarterly disclosure certification should be tracked. The buyer's TSA team should ask follow up questions when the certification is unclear. The buyer should treat the MFN review as part of the operating rhythm, not a single check. The complete operating cadence for active TSAs is in TSA exit governance best practices.

More on TSA negotiation.