> ## Content Index > Fetch the complete content index at: https://www.thetaxgazebo.ca/llms.txt > Use this file to discover other available public pages before exploring further. # The Prenup: Why Business Partners Need a Shareholders’ Agreement - URL: https://www.thetaxgazebo.ca/articles/the-prenup/ - Published: 2026-09-12T22:49:04.000Z - Updated: 2026-09-12T22:49:04.000Z - Author: Emily Mantle - Tags: Starting & Structuring A business partnership is, in every practical sense, a marriage. When you first go into business with someone, you are in the honeymoon phase. You are unified by a shared vision, a lot of late nights and the excitement of building something from nothing. The absolute last thing you want to do is sit across a table and talk about what happens if you start to resent each other. But that is exactly what you need to do. A Shareholders' Agreement is the prenup for your corporate bucket. Its job is to write the rules for the divorce before there is serious money on the table, and while you both still like each other. You may dodge it because bringing up death, disability or a messy split feels like bad luck, or worse, a lack of trust. It is uncomfortable to look your partner in the eye and say: "What if you stop pulling your weight?" "What if we fundamentally disagree?" "What if you get hit by a bus?" But avoiding the conversation does not eliminate the risk. It just means that if the worst happens, you will be negotiating the rules in the middle of a crisis, with the Income Tax Act sitting at the table as an uninvited third party. That last part is what a lot of conversations about Shareholders' Agreements leave out. A Shareholders' Agreement is a legal document, and a lawyer should draft it. But many of its most important clauses can have significant tax consequences too. Two structures can look almost identical from a legal perspective and produce very different tax results. So let's walk through some of the hard questions and the tax sitting underneath them. ## Decision Rights Who has the final say when there is a fundamental disagreement? Which decisions can one of you make alone, and which ones require both of you? Two decisions deserve particular attention. The first is when and how much the corporation pays in dividends, because distributions from the corporation ultimately affect each shareholder's personal tax position. The second is what the corporation does with surplus cash. Allowing excess cash and investments to accumulate inside an operating company can quietly jeopardize access to the lifetime capital gains exemption. More on that below. Both deserve explicit treatment in the agreement, along with other major decisions like taking on significant debt, issuing new shares, buying another business, selling major assets or changing the nature of the company. You do not need two signatures every time somebody buys a laptop. You do need to decide which choices are important enough that neither partner should be making them alone. ## Work and Compensation What happens if one shareholder is working 70 hours a week while the other quietly checks out? This is where the mechanics matter. Salary follows work. Dividends follow shares. If you each own 50% of the same class of shares, every dollar of dividends declared on that class generally follows those shareholdings, whether one of you worked 70 hours or zero. The corporation can pay the working shareholder a larger salary or bonus. It generally cannot just decide that one holder of identical shares gets a bigger dividend than the other. The agreement therefore needs to contemplate what happens when contribution changes. There are different ways to deal with this. Compensation might be primarily salary or bonus, adjusted based on each person's role and contribution, while dividends remain the return on ownership. Or the share structure might give each shareholder a separate class of shares so that dividends can be declared independently on each class. That second structure is common. It also introduces another acronym into the marriage: TOSI. The tax on split income rules can apply the top marginal tax rate to certain dividends received from a related private business. One important safe harbour treats a shareholder as actively engaged in the business if they work an average of at least 20 hours per week during the part of the year the business operates. Someone who met that threshold in any five previous years can generally continue to rely on the excluded-business exception even after stepping back. The 20 hours is a safe harbour, though, not an automatic dividing line. Someone who works less may still be considered actively engaged based on the facts and circumstances, and other exceptions can apply. For shareholders age 25 or older, for example, there is an excluded-shares exception where the shareholder owns at least 10% of the votes and value. But that exception is not available for a professional corporation, and it generally does not apply where 90% or more of the corporation's business income comes from providing services. That describes an awful lot of professional and consulting businesses. Now imagine a partner who checks out in year three. They have not accumulated five qualifying prior years. The company primarily sells services. They are no longer meaningfully involved. The dividends they receive may now be exposed to TOSI unless another exclusion applies. What started as a conversation about whether two partners are contributing equally has become a tax problem too. The agreement should contemplate what happens to compensation, ownership and ultimately the shares when one person's involvement in the business fundamentally changes. ## Disability Everyone writes "death and disability" as one heading and then spends most of their time talking about death. Disability is often harder. The person is alive. They are not working. They still own their shares and everything that comes with them, including economic rights, voting rights and access to information. If an attorney for property is now acting on their behalf, you may also find yourself dealing with someone else when those shareholder rights need to be exercised. And unlike death, this situation could continue for years. The agreement needs to define disability. How long does someone have to be unable to work? Who decides that they are disabled? Does salary continue, and for how long? Do dividends continue? At what point does a temporary absence become a permanent buyout? And once the buyout is triggered, where does the money come from? Disability buy-sell insurance exists for exactly this reason. There is also an important tax distinction here. Disability insurance proceeds do not create a capital dividend account balance in the way qualifying life insurance proceeds can. That becomes much more important when we get to death. ## Death This is where the tax gets serious. It is also where a lot of owner-managers have no idea what is about to happen to their family. ### Step one: the sale nobody made When a shareholder dies, the Income Tax Act generally treats them as having disposed of their shares at fair market value immediately before death. Nobody bought them. Nobody wrote a cheque. For tax purposes, the "sale" happened anyway. Imagine you started a company with $100 of shares and, years later, those shares are worth $2 million. Ignoring other adjustments, the deceased shareholder has a capital gain of almost $2 million on their terminal tax return. In Ontario, that can mean roughly half a million dollars of tax before considering the lifetime capital gains exemption or other planning. No actual sale occurred. The tax bill is still real. There can be a tax-deferred rollover where shares pass to a spouse or qualifying spousal trust. That solves the immediate tax problem. But notice what else happened. The shares passed to the spouse. You may now have a business partner you never chose. And the tax was deferred, not eliminated. It generally comes back when the spouse eventually disposes of the shares or dies. ### Step two: the second tax Assume instead that the shares were taxed at fair market value on death. The estate generally acquires those shares with a cost base reflecting that value. Now the estate wants out. If the corporation simply redeems the shares, most of the redemption amount is generally treated as a deemed dividend rather than ordinary sale proceeds for capital-gain purposes. That can create a second layer of tax. The deceased has already been taxed on the increase in value of the shares. Now the estate may be taxed again while extracting that same corporate value. This is the classic post-mortem double-tax problem. Fortunately, there are established planning techniques designed to deal with it. One is a loss carryback. A graduated rate estate can trigger a capital loss on the shares and, if the conditions are met, elect under subsection 164(6) to carry that loss back against the capital gain reported on the deceased's terminal return. For deaths on or after August 12, 2024, that planning window now extends through the first three taxation years of the graduated rate estate. This was a very welcome change that received Royal Assent in March 2026\. Before that, the election was limited to the estate's first taxation year, which could be a very short window to get the planning completed in practice. Another approach is commonly called a pipeline. Rather than creating the capital loss, a properly structured pipeline seeks to preserve the capital-gain treatment created at death and extract the corporate value over time, often through a promissory note that is repaid over time. Both strategies have technical requirements and timing considerations. Neither happens automatically. And both are easier to implement when the Shareholders' Agreement was written with post-mortem planning in mind. ### Step three: paying for the shares Solving the tax problem does not solve the cash problem. Someone still has to come up with the money to buy out the family. This is where corporate-owned life insurance earns its place in many well-designed Shareholders' Agreements. When a private corporation receives qualifying life insurance proceeds on the death of an insured person, the death benefit is generally received without an income inclusion. The amount of the proceeds in excess of the policy's adjusted cost basis can generally be added to the corporation's capital dividend account, or CDA. A private corporation can elect to pay capital dividends from its available CDA to Canadian-resident shareholders without those dividends being included in their income. That creates something enormously valuable at exactly the moment the business needs it: liquidity. The corporation may suddenly have the cash to fund a redemption of the deceased shareholder's shares, and the CDA may allow some of that value to move to the estate tax-free. Compare that with requiring the surviving shareholder to personally come up with $2 million of after-tax money to buy the shares. At Ontario's highest marginal tax rates, generating $2 million of personal after-tax cash could require more than $4 million of pre-tax income. Insurance can turn what might otherwise be an impossible funding problem into a manageable one. But owning the insurance is only part of the planning. You still have to decide how to use it. ### Step four: the structure How the buyout is structured changes the tax result. This is one place where I generally want a Shareholders' Agreement to preserve flexibility rather than hard-code one solution years before anyone knows what the circumstances will actually be. One option is a personal or cross-purchase structure. The surviving shareholder buys the shares directly from the estate. Because the shares were generally stepped up to fair market value on death, the estate may have little or no additional capital gain on that sale. The surviving shareholder, meanwhile, acquires additional tax cost in the shares they purchased. That increased cost base can become very valuable if the survivor eventually sells the company. Separately, if the deceased's shares qualified as qualified small business corporation shares, the deceased may be able to claim their available lifetime capital gains exemption against the gain arising on the deemed disposition at death. The maximum LCGE is $1.275 million in 2026. The other major option is a corporate redemption. The corporation redeems the estate's shares itself, producing a deemed dividend. Where life insurance has created CDA, some of that dividend may potentially be elected as a tax-free capital dividend. But the surviving shareholder does not get the same increase in the cost base of their own shares. There is another wrinkle. The stop-loss rules can reduce the capital loss otherwise available to the estate where certain dividends, including capital dividends, have been received on the shares. That matters if the post-mortem plan relies on carrying that capital loss back to the deceased's final return. This is why planners sometimes model what is known as the 50% solution, carefully limiting the capital-dividend portion of a redemption so that more, or all, of the estate's capital loss remains available for carryback. There is no universal answer. Sometimes a personal purchase makes sense. Sometimes a redemption makes sense. Sometimes a hybrid works best, with some shares purchased personally by the survivor to create additional cost base and others redeemed by the corporation to make use of corporate liquidity and available CDA. Which structure wins depends on the numbers, the share classes, the insurance, whether the shares qualify for the capital gains exemption, the deceased's other tax attributes and what the surviving shareholder intends to do with the company afterward. You cannot know all of that when you sign a Shareholders' Agreement. So I would not unnecessarily lock the parties into one tax structure years in advance. The agreement should contemplate the alternatives and require the estate, corporation and surviving shareholder to cooperate in implementing a reasonable structure that takes the tax consequences into account. ### Protecting the exemption There is one more problem. The lifetime capital gains exemption only helps if the shares actually qualify. For shares of a private operating company, that generally means meeting the qualified small business corporation share tests. At the time of a normal sale, roughly 90% or more of the value of the corporation's assets generally has to be connected to an active business carried on primarily in Canada or consist of other qualifying assets. There is also a 24-month ownership and asset-use test under which, among other requirements, more than 50% of the corporation's asset value generally has to satisfy the relevant active-business tests throughout that period. Death gets a little bit of extra help. If the shares would otherwise qualify, and they were qualified small business corporation shares at some point during the 12 months before death, a special rule can preserve their QSBC status even if the corporation no longer meets the 90% test immediately before death. That does not mean purification no longer matters. The historical 24-month test still matters, and a corporation that has carried too many passive assets for too long can still lose access to the exemption. This is where successful companies can accidentally get themselves into trouble. The business makes money. The owner leaves the surplus in the corporation. Cash accumulates. Then the cash gets invested. Maybe the company buys a rental property. Slowly, the operating company becomes part business and part investment portfolio. The death rule gives you some breathing room on the point-in-time test. It does not fix years of accumulating too many passive assets. And a surprise offer to buy the business does not come with the same 12-month relief. A good Shareholders' Agreement should therefore still contemplate purification. In plain English, that means keeping an eye on the corporation's asset mix and allowing excess cash or passive assets to be moved out, often to a holding company, when appropriate. The exemption is too valuable to simply assume it will be there when you need it. ## Deadlock, Exit and Valuation Death is not the only way a business partnership ends. Sometimes the relationship just breaks down. If the two of you fundamentally disagree about where the company is going, how do you separate without destroying the company in the process? A shotgun clause is one mechanism. One shareholder names a price and the other must either buy at that price or sell at that price. It sounds beautifully simple. It can also be incredibly harsh. If one shareholder has significantly deeper pockets than the other, the shotgun can become a mechanism that only one of them can realistically use. There are other ways to structure an exit, but whatever mechanism you choose ultimately sits on top of another question: What is the business worth? That sounds like a legal drafting issue. It can turn into a tax issue very quickly. The deemed disposition on death happens at fair market value. But in a closely held private corporation, the Shareholders' Agreement itself can affect what fair market value actually is. A bona fide and binding buy-sell arrangement with a current and reasonable valuation mechanism may be highly relevant in determining share value. A formula somebody typed into an agreement in year two and forgot to update for the next decade is considerably less comforting. The agreement therefore needs a valuation mechanism that still makes sense when someone eventually has to use it. That might mean a defined methodology. It might mean updating the value periodically. It might mean bringing in an independent Chartered Business Valuator when the parties disagree. And where appropriate, the eventual transaction documents may include a properly drafted price adjustment clause so that if CRA or a court later determines that fair market value was different from the value used by the parties, there is a mechanism to adjust the consideration. That does not mean you get to invent a convenient number. CRA expects the parties to have genuinely intended to transact at fair market value and to have used a fair and reasonable method to determine it. The goal is simply to avoid finding out after the transaction that the tax system and the Shareholders' Agreement were working with two completely different numbers. ## Who Should Be in the Room A lawyer drafts the Shareholders' Agreement. That is as it should be. But if your accountant reads it for the first time after everybody has already signed it, you may have created a legal document with significant tax consequences while only one of the two disciplines was involved. Bring both in early. This kind of planning is not inexpensive. You may be paying a lawyer, an accountant and sometimes an insurance advisor or valuator to plan for things you hope never happen. I understand why business owners are sometimes reluctant to spend the money on it. But this is also one of those areas where saving money upfront can become extraordinarily expensive later. Fixing a poorly structured buyout, shareholder dispute or post-mortem tax problem after the fact is a very different exercise. The lawyer is thinking about control, enforceability, obligations, disputes and protecting the parties. The accountant should be thinking about share classes, compensation, TOSI, insurance, CDA, the capital gains exemption, purification and what happens when somebody eventually has to get their money out. Those conversations belong together. Having a Shareholders' Agreement does not mean you lack faith in the partnership. It means you respect the business, and each other, enough to decide what fair looks like while you are still capable of agreeing. Write the rules when everyone is healthy. Write them when everyone is working. Write them when nobody wants out. Write them while you still like each other. Because that is the only time the prenup is easy. Once the partnership rules are locked in and the bucket is legally and fiscally sound, we finally get to the fun part. How do you actually get the water out of the bucket to buy your groceries, pay your mortgage and fund your life? That brings us to **The Two Faucets**, which we'll explore in the next Tax Gazebo.