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BUSINESS LAW GUIDE
Shareholder Agreements in Ontario
A practical guide to ownership, decision-making, share transfers, exits and the difficult questions business partners should answer before there is a dispute.
A shareholder agreement turns assumptions between business owners into clear rules. It can address who controls important decisions, what happens when new shares are issued, whether an owner can sell, and how the business responds when a shareholder leaves, dies, defaults or wants out.
Prepared by Tatyana Trusz, Trusz Law • Updated July 2026 • 12 min read
QUICK ANSWER
Do business partners need a shareholder agreement?
A shareholder agreement is not a universal legal requirement for every Ontario corporation, but it can be one of the most important documents for a corporation with two or more owners. It creates agreed rules for control, major decisions, funding, share transfers, departures and disputes before those issues become urgent.
Not every shareholder agreement is a unanimous shareholder agreement. Under Ontario’s Business Corporations Act, a unanimous shareholder agreement can go further by restricting some or all of the directors’ management powers. To the extent those powers are transferred, the participating shareholders take on corresponding rights, duties and potential liabilities.
IN THIS GUIDE
RELATED BUSINESS LAW
OWN A BUSINESS TOGETHER?
The important questions are easier before there is a disagreement.
Talk through control, ownership, exits and the future of the company while the owners can still plan together.
THE SHORT ANSWER
What does a shareholder agreement actually do?
A corporation’s articles, by-laws and corporate law provide part of the framework for how the company operates. A shareholder agreement adds a private set of rules between the owners for the issues that matter to their particular business relationship.
A well-drafted agreement can answer questions such as:
- Who has the right to appoint directors?
- Which decisions can management make, and which require shareholder approval?
- What happens if the company needs more money?
- Can a shareholder sell to an outsider?
- Do existing shareholders get a chance to buy first?
- What happens if an owner dies, becomes disabled, stops working in the business or seriously breaches the agreement?
- How is a buyout price calculated and paid?
- What happens if the owners reach a deadlock?
The purpose is not to predict every possible conflict. It is to create a workable decision system for the moments when personal trust alone is not enough.
KEY TAKEAWAYS
At a glance
- A shareholder agreement creates rules between owners that are tailored to the business.
- It should deal with both everyday governance and difficult events such as deadlock, departure, death and a proposed sale.
- A regular shareholder agreement and a unanimous shareholder agreement are not necessarily the same thing.
- Ontario law allows a unanimous shareholder agreement to restrict directors’ powers, but doing so can shift corresponding duties and liabilities to shareholders.
- 50/50 companies need a deliberate deadlock process because neither owner can simply outvote the other.
- The best agreement is usually negotiated before a dispute, financing round or exit puts pressure on the relationship.
TIMING
When should shareholders put an agreement in place?
The strongest time to negotiate a shareholder agreement is usually when the owners are still aligned and can discuss difficult possibilities without a current dispute driving the conversation.
It is especially worth considering when:
- Two or more founders are incorporating together. Ownership percentages alone do not explain who does what or how decisions will be made.
- A new shareholder is joining. The existing owners may need clear rules for voting, information, dilution and transfers.
- The company is raising money. An investor may ask for governance, information, approval or exit rights.
- The owners work in the business. The agreement should coordinate with, rather than confuse, employment or contractor arrangements.
- The ownership is 50/50. Equal voting power makes deadlock planning particularly important.
- The company is becoming more valuable. Unclear exit and valuation rules become harder to negotiate after the stakes rise.
An agreement can also be created later in the life of a company, but the conversation is often more difficult once expectations have already diverged.
A KEY DISTINCTION
Shareholder agreement vs. unanimous shareholder agreement
The terms are often used interchangeably in conversation, but they can have different legal effects.
| Question | Shareholder agreement | Unanimous shareholder agreement |
|---|---|---|
| Who is involved? | Can be an agreement among some or all shareholders, depending on its purpose | Generally involves all shareholders for the statutory effect described by corporate law |
| What can it do? | Set contractual rules for voting, transfers, funding, exits and other owner relationships | Can also restrict some or all of the directors’ powers to manage or supervise the business |
| Why does that matter? | The agreement mainly operates through its contractual terms | Shareholders can take on rights, duties and liabilities corresponding to the director powers that are restricted |
Under section 108 of Ontario’s Business Corporations Act, all shareholders may enter into a written agreement that restricts directors’ management powers. The Act also provides that a transferee of shares subject to a unanimous shareholder agreement is deemed to be a party, and a unanimous shareholder agreement may include a process for arbitration if the shareholders cannot resolve a matter covered by the agreement.
The distinction should be considered deliberately. A document should not be labelled or structured as a unanimous shareholder agreement without understanding the governance and liability consequences.
WHAT THE AGREEMENT SHOULD ADDRESS
Ten decisions a shareholder agreement should make clear
1. Ownership and the capitalization table
The agreement should match the corporation’s actual share records. It should be clear who owns which shares, what rights those shares carry and whether any ownership is intended to be earned, repurchased or adjusted over time.
A shareholder agreement cannot fix an inaccurate capitalization table by itself. The legal records and the agreement should tell the same story.
2. Board composition and decision-making
Owners should decide who can appoint or nominate directors and which matters can be handled in the ordinary course of business.
The agreement can also identify major or “reserved” matters that require a higher level of approval, such as issuing new shares, taking on substantial debt, changing the nature of the business, selling major assets or approving a sale of the company.
3. The roles of shareholders who work in the business
A shareholder can be an owner, director, officer and employee at the same time. Those roles should not be treated as interchangeable.
The agreement should coordinate with employment or contractor documents on duties, compensation and termination. Losing a job in the business does not automatically answer what happens to that person’s shares.
4. Future financing and capital contributions
What happens if the company needs cash? Can shareholders be required to contribute more money? Is additional funding treated as debt or equity? What happens if one shareholder funds the company and another cannot?
These questions are easier to answer before the business urgently needs money.
5. New shares, dilution and participation rights
New share issuances can change both economics and control. Founders should not assume they will automatically maintain the same ownership percentage forever.
If existing shareholders are intended to receive a first opportunity to participate in certain future issuances, that protection should be structured deliberately in the appropriate corporate documents.
6. Restrictions on selling or transferring shares
Most closely held companies do not want an owner to sell shares to an unknown third party without a process.
The agreement may include permitted transfers, consent requirements, rights of first refusal or other mechanisms that balance a shareholder’s ability to exit with the remaining owners’ interest in controlling who becomes a business partner.
7. Tag-along and drag-along rights
Tag-along rights can help protect a minority shareholder by allowing that shareholder to participate when a controlling shareholder sells.
Drag-along rights can help a qualifying majority complete a sale of the whole company by requiring other shareholders to sell on the same terms, subject to the agreement’s conditions.
These clauses should fit the ownership structure and the kind of exit the owners realistically expect.
8. Departure, death, disability and default
A shareholder may leave voluntarily, die, become unable to participate, become insolvent or seriously breach the agreement. The company still needs a process.
The agreement should identify which events trigger a purchase right or obligation, who can buy the shares and whether different events lead to different pricing or payment terms.
9. Valuation and payment terms
“Fair market value” can sound clear until the owners disagree about what it means, which date applies or whether minority and marketability discounts should be considered.
A practical agreement should explain the valuation process, who performs it, what information is used, how disagreements are handled and whether a buyout can be paid over time.
10. Deadlock and dispute resolution
Not every disagreement should trigger a forced buyout. A good process may move through internal discussion, escalation, mediation, arbitration or a buy-sell mechanism depending on the seriousness of the issue.
The objective is to create a path forward when the normal decision process stops working.
“A shareholder agreement is not a prediction that the relationship will fail. It is a plan for how the company keeps functioning when the owners do not agree.”
— Trusz Law
50/50 OWNERSHIP
Why equal ownership needs a deadlock plan
A 50/50 company can feel balanced: neither owner controls the other. The same structure can also create paralysis when a decision requires both owners and they cannot agree.
A deadlock clause should be designed around the real business. Options may include:
- a defined negotiation period between the owners;
- escalation to trusted advisors or a board process;
- mediation or arbitration for appropriate disputes;
- a buy-sell mechanism;
- a process to market or sell the company; or
- another tailored exit mechanism.
There is no perfect standard clause. For example, a “shotgun” buy-sell mechanism can create pressure for a resolution, but it may favour the shareholder with greater access to money. The right process depends on the owners’ resources, the nature of the company and whether preserving the business is more important than forcing a quick separation.
THE PROCESS
How is a shareholder agreement usually created?
01 Understand the company and the owners
Review the share structure, capitalization table, articles, by-laws, corporate records, founder roles and the company’s plans for financing and growth.
02 Identify the decisions that need rules
Map out governance, reserved matters, funding, dilution, transfers, exits, valuation, deadlock and other issues that matter to this particular ownership group.
03 Draft the agreement around the real business
The first draft should reflect how the owners actually want the company to operate—not simply copy a generic precedent.
04 Negotiate the difficult points
The value of the process is often in the conversation. A clause that looks balanced in theory may affect a founder, majority owner or minority investor very differently in practice.
05 Coordinate the corporate documents
The shareholder agreement, articles, by-laws, share terms, employment agreements and other corporate records should be reviewed for inconsistencies.
06 Sign, record and revisit
Keep the executed agreement with the corporation’s records, use appropriate steps when new shareholders join and revisit the document after major changes in ownership, financing or the business itself.
COMMON MISTAKES
Problems that are easier to prevent early
Downloading a generic template and changing the names.
The hard part is not finding clauses. It is deciding which clauses fit the ownership, leverage and future of the company.
Creating a 50/50 company with no deadlock process.
Equal ownership does not resolve disagreement. It can make disagreement harder to break.
Using an unclear valuation formula.
A formula that cannot be applied when the relationship is strained may create a second dispute instead of solving the first.
Assuming employment and ownership are the same thing.
A shareholder who stops working for the business may still own shares unless the documents create a separate process.
Ignoring future financing.
New money can change ownership, control and expectations. The agreement should anticipate how funding decisions are made.
Failing to coordinate the agreement with the articles and by-laws.
Corporate documents should work together. Conflicting rules create uncertainty.
Waiting until the owners are already in conflict.
Once trust breaks down, even reasonable terms can become difficult to negotiate.
HOW TRUSZ LAW CAN HELP
Put the difficult business questions into clear, workable language.
Trusz Law helps Ontario founders, family businesses and privately held companies prepare, review and negotiate shareholder agreements.
Depending on the ownership structure, that may include advice on governance, reserved decisions, financing, share issuances, transfer restrictions, rights of first refusal, tag-along and drag-along rights, buyouts, valuation, deadlock and the distinction between an ordinary shareholder agreement and a unanimous shareholder agreement.
The goal is a document the owners can actually understand and use—not a set of generic clauses that only becomes visible after a dispute starts.
FREQUENTLY ASKED QUESTIONS
Shareholder agreement questions business owners often ask
Is a shareholder agreement required in Ontario?
No general rule requires every Ontario corporation to have a shareholder agreement. However, a corporation with two or more owners should consider whether it needs clear contractual rules for decision-making, financing, transfers, exits and disputes. The need usually increases as the number of owners, value of the company and complexity of the business increase.
What is the difference between a shareholder agreement and a unanimous shareholder agreement?
A shareholder agreement can create contractual rules among owners. A unanimous shareholder agreement has a specific corporate-law effect when all shareholders agree to restrict some or all of the directors’ powers to manage or supervise the corporation. Under Ontario law, participating shareholders assume corresponding rights, duties and potential liabilities to the extent those director powers are restricted.
When should founders sign a shareholder agreement?
Ideally, founders should discuss the agreement before or soon after shares are issued and before the business becomes difficult to unwind. Other important times include when a new shareholder joins, the company raises financing, ownership percentages change or the business becomes materially more valuable.
What happens if a company has no shareholder agreement?
The company still operates under its articles, by-laws, applicable corporate law and any other binding contracts. The problem is that those documents may not answer the owners’ specific questions about deadlock, buyouts, transfers, departures or valuation. A dispute can therefore become more expensive and less predictable.
Can two 50/50 shareholders use a shareholder agreement to prevent deadlock?
A shareholder agreement cannot guarantee that two owners will always agree, but it can create a process for what happens when they do not. That process may include negotiation, escalation, mediation, arbitration, a buy-sell mechanism or another tailored exit procedure.
Can a shareholder agreement stop an owner from selling shares?
A shareholder agreement can place contractual restrictions and procedures around share transfers, subject to applicable law and the corporation’s other governing documents. Common mechanisms include consent requirements, permitted transfers and rights that give existing shareholders an opportunity to participate before a sale to an outsider.
What happens to shares when a shareholder dies?
The answer depends on the corporation’s documents, estate planning, insurance and applicable law. A shareholder agreement may create a purchase right or obligation, specify who can buy the shares, set a valuation process and establish payment terms. Those provisions should be coordinated with the shareholder’s estate plan rather than drafted in isolation.
How often should a shareholder agreement be updated?
Review it when the business changes materially—for example, after a financing round, a new shareholder, a major change in ownership, a new class of shares or a significant shift in the company’s operations. Even without a major event, a periodic review can identify provisions that no longer match how the company actually works.
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ABOUT THIS RESOURCE
Prepared by Tatyana Trusz, Trusz Law. This resource is for general information only and is not legal advice. Shareholder rights and outcomes depend on the corporation’s governing law, share structure, agreements and specific facts. Last reviewed July 2026.
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