Why does private company share valuation in Ontario cause so much disagreement? This happens even when the shareholder agreement already addresses it.
This article explains why fair market value looks sufficient on paper but rarely is in practice. It also covers where valuation clauses break down, and what that ambiguity ends up costing.
Key Takeaways
- Most shareholder agreements reference fair market value, but very few define what that means in an applicable way.
- Fair market value looks like an objective standard at signing. That assumption only holds until a transaction is required.
- Determining value requires a specific methodology, and different methodologies produce meaningfully different results.
- Without a defined dispute resolution mechanism, disagreements over value default into open negotiation.
- Ambiguity increases cost through professional fees, delayed transactions, and escalating disputes.
- Valuation interacts directly with exit mechanisms and buy-sell provisions.
- A vague clause can undermine an otherwise solid agreement.
- Valuation is not a placeholder. It is a mechanism that must actually function under real pressure.
Why “Fair Market Value” Isn’t Enough in a Shareholder Agreement

Most shareholder agreements in Ontario reference fair market value when addressing private company share valuation.
Very few actually define what that phrase means in a way that can be applied without disagreement later.
At the time of drafting, fair market value appears entirely sufficient. It suggests an objective standard that everyone can rely on, implying that value can be determined independently and accepted by all parties.
That assumption holds up well until a transaction is required, but then it often falls apart. Two shareholders who once agreed the phrase was clear enough can read it very differently once real money is on the table.
How Private Company Share Valuation in Ontario Is Calculated
Determining private company share valuation in Ontario requires an actual methodology, not just a phrase referencing fairness.
Without specifying which method applies, the agreement defers the most important question and gets pushed to the exact moment of conflict.

Discounted Cash Flow
This approach values a company based on projected future cash flows, discounted back to present value. It depends heavily on assumptions about growth, risk, and timing.
Comparable Transactions
This method looks at recent sales of similar companies to estimate value. It depends on finding genuinely comparable transactions, which can be difficult for a private company.
Asset-Based Approaches
This approach values a company based on its underlying assets rather than its earning potential, often producing a very different number than the other two methods.
Each of these methods produces meaningfully different results depending on the assumptions applied. Without specifying which one governs, an agreement leaves this unresolved until someone actually needs the number.
Resolving Disputes Over Share Valuation
When parties disagree on value, the agreement must provide a clear way to resolve that disagreement. If it does not, the process simply becomes open negotiation between people who already disagree.
Without a defined mechanism, the valuation process can stall entirely. A handful of structures tend to work reasonably well when they are actually included.

Independent Valuators
The agreement designates a qualified, independent professional to determine value. This removes the need for either party to convince the other directly.
Averaging Methods
Each party obtains their own valuation. The agreement specifies how the two numbers get reconciled, often through a simple average or a defined formula.
Binding Determinations
The agreement specifies that a chosen process produces a final, binding result. This prevents either party from rejecting the outcome and restarting the dispute.
Without one of these structures, disagreements over value tend to escalate rather than resolve, as neither party has any obligation to accept the other's number.
The process can drag on for months without something forcing a resolution.
The Cost of Ambiguity
Ambiguity in a valuation clause increases cost considerably, often happening in ways that are not obvious until the process is already underway.
Professional fees increase as multiple competing opinions are obtained, and transactions get delayed while the parties work through disagreement.
In some cases, disputes escalate well beyond the original valuation question itself.
The cost of resolving this kind of ambiguity after the fact often exceeds the cost of addressing it clearly in advance.
This mirrors the broader pattern we describe in our overview of shareholder agreements in Ontario.
Vague valuation provisions consistently rank among the most common points of failure once an agreement gets tested.
How Valuation Interacts With Shotgun and Buy-Sell Clauses

Valuation does not operate in isolation from the rest of a shareholder agreement. It interacts directly with exit mechanisms, buy-sell provisions, and transfer restrictions throughout the document.
A vague valuation clause can undermine otherwise well-structured provisions elsewhere.
A carefully drafted shotgun clause, for example, still depends entirely on a workable valuation methodology to function fairly.
Without one, the shotgun mechanism inherits the same ambiguity, regardless of how well the rest of that clause was drafted.
When Ambiguity Becomes a Legal Problem
Disagreements over valuation that cannot be resolved internally sometimes escalate into formal disputes. Oppression remedy cases involving this ambiguity are searchable through CanLII under the Ontario Business Corporations Act.
Courts examining these cases tend to focus heavily on what the agreement actually specifies, or fails to specify. They focus less on what either party assumed fair market value would mean at signing.
This is precisely why the gap between assumption and specification matters so much.
What a Clear Share Valuation Clause Should Include
A handful of elements consistently show up in valuation clauses that actually hold up once they are tested.

A Named Methodology
The clause specifies which valuation method applies. This could be discounted cash flow, comparable transactions, an asset-based approach, or a defined combination.
A Trigger Mechanism
The clause identifies exactly when a valuation gets performed. This could tie to a shotgun notice, a shareholder's exit, or a periodic schedule.
A Named Valuator or Selection Process
The agreement either names a valuator in advance or sets out a clear process for selecting one when the need arises.
A Cost Allocation Rule
The clause specifies who pays for the valuation. Costs might split evenly, fall to the initiating party, or follow some other defined rule.
Agreements missing several of these elements tend to generate the most disagreement once a valuation actually becomes necessary.
Building them in early, while relationships remain cooperative, is far easier than negotiating them under pressure later.
When to Involve a Lawyer
The ideal time to involve a lawyer is while drafting or reviewing an agreement, well before any transaction requires a valuation.
A lawyer can help select a specific methodology and define a dispute resolution mechanism.
A lawyer can also ensure the valuation clause actually interacts properly with exit and buy-sell provisions elsewhere.
For more on how shareholder agreements govern these interconnected issues, see our overview of shareholder agreements in Ontario.
The Bottom Line on Private Company Share Valuation in Ontario
Valuation is not a placeholder concept that can be resolved later without consequence. It is a mechanism that must actually function under real pressure.
This often happens at the exact moment relationships between shareholders are most strained.
If valuation is not defined clearly, it tends to become the specific point at which the entire agreement stops working.
This is true even when every other provision in the document was carefully drafted and genuinely well considered.
If your shareholder agreement relies on “fair market value” without a defined method, our team at Levine Law can help. We can build a valuation clause that actually works before a buyout or dispute puts it to the test.
Frequently Asked Questions
Why is fair market value alone not enough in a shareholder agreement?
It suggests an objective standard without a defined methodology. The calculation stays undefined until a dispute forces the question.
What valuation methodologies are commonly used for private companies?
Discounted cash flow, comparable transactions, and asset-based approaches are the most common. Each produces very different results.
What happens if shareholders disagree on a company's value?
Without a defined resolution mechanism, the disagreement typically becomes open negotiation, which can stall or escalate.
What mechanisms help resolve valuation disputes effectively?
Independent valuators, averaging methods, and binding determination clauses are common structures that prevent stalled disputes.
Why does valuation ambiguity cost more than addressing it upfront?
Ambiguity leads to multiple professional opinions, delayed transactions, and escalated disputes. All of these cost more than clear drafting.
Does a vague valuation clause affect other parts of the agreement?
Yes. Valuation interacts with exit mechanisms and buy-sell provisions, so ambiguity there can undermine otherwise well-drafted clauses.
Can a valuation clause be updated after a shareholder agreement is signed?
Yes. Amending the clause to specify a methodology and dispute process can happen any time before a valuation is actually needed.
When should a business address valuation ambiguity in its agreement?
Ideally during initial drafting or a periodic review, well before any transaction, exit, or dispute forces the question.
