A co-owner buyout is a share purchase between people who already know the business. The statutory mechanics that decide how it goes are not obvious, and the financing constraint is one buyers routinely discover too late.
Key takeaways
STEP 01 OF 10
A unanimous shareholder agreement, once in place, is not optional guidance — CBCA s. 146(1) states an agreement among all the shareholders restricting the directors' powers “is valid”, and a buy-sell mechanism written into it (a shotgun clause, a valuation formula, a departure trigger) governs the buyout before any statutory remedy needs to be considered. Treadstonelaw’s guide to Ontario buy-sell provisions lists voluntary departure, death, disability, termination, resignation, insolvency, divorce and deadlock as the seven triggers such a clause typically covers — check which one actually applies before assuming the mechanism is engaged.
STEP 02 OF 10
CBCA s. 190 gives a dissenting shareholder the right to be paid the fair value of their shares in specific circumstances — but it is not a general buyout tool. It triggers on events like an amalgamation, a continuance, or a sale of substantially all the corporation’s property, and the timeline is precise: written objection before the meeting, a corporate notice within ten days of the resolution, a shareholder demand within twenty days of that notice, and a corporate offer within seven days of the later of effectiveness and the demand, stating how fair value was determined. Fair value is fixed “as of the close of business on the day before the resolution was adopted,” and there is no partial dissent.
STEP 03 OF 10
CBCA s. 241 lets a court act where conduct is “oppressive or unfairly prejudicial to or that unfairly disregards the interests of any security holder,” and the remedies listed explicitly include ordering a purchase of securities, amending or creating a unanimous shareholder agreement, and varying or setting aside a transaction. Treadstonelaw’s Ontario shareholder-buyout guidance adds a specific and useful point: courts can order a buyout at full fair value without applying a minority discount if majority conduct has been unfair — a real distinction from a voluntary sale, where a minority stake is routinely discounted for its lack of control.
STEP 04 OF 10
A departing shareholder’s shares can be bought by the corporation itself (a share redemption), by the remaining shareholder personally, or by a newly incorporated vehicle the remaining shareholder controls. Each route has different tax and financing consequences, and the choice should be made deliberately rather than defaulted into — see drafting a shareholder agreement for a buyout group if more than one person is buying in together.
A share redemption reduces the corporation's own capital and needs to be checked against solvency requirements before the directors approve it; a personal purchase by the remaining shareholder concentrates ownership directly; a newco structure can be used where the remaining shareholder wants to roll in outside capital or bring in a new partner alongside the buyout. None of these is the default — pick deliberately, because unwinding the wrong structure after closing is far more expensive than choosing correctly at the outset.
STEP 05 OF 10
This is the financing trap buyers discover latest and regret most. ISED’s own programme FAQ is unambiguous: “you cannot use a loan to finance items such as share purchases or assets that a holding company acquires”. The programme can finance the purchase of eligible assets, real property, equipment and leasehold improvements — not the shares themselves. A remaining shareholder planning to fund a co-owner buyout needs conventional bank financing, a vendor take-back note from the departing shareholder, personal capital, or some combination — not the CSBFP alone.
STEP 06 OF 10
Treadstonelaw’s buy-sell guidance names four approaches used in practice: a fixed formula (a multiple of EBITDA or revenue), book value off the balance sheet, an annually agreed value, or an independent valuation by a business valuator determining fair market value. Where the agreement is silent or there is no agreement, an independent valuation is usually the only method both sides will accept without a fight — CBV Institute’s practice standards, effective for engagements beginning on or after 1 January 2026, set the minimum requirements a valuator must meet for a credible and properly supported conclusion of value.
STEP 07 OF 10
A buyout does not need to be paid entirely at closing. Treadstonelaw’s buy-sell guidance describes instalment structures running over three to five years, sometimes backed by life or disability insurance where the trigger is death or incapacity rather than a voluntary departure. A departing shareholder financing part of the price themselves through a note is, functionally, filling the exact gap the CSBFP cannot fund — confirm the note’s security and priority against any bank financing the buyer also uses.
STEP 08 OF 10
The share register, the minute book, and any transparency register an Ontario OBCA corporation maintains all need updating immediately — a private OBCA corporation must track individuals holding or controlling 25% or more of the shares by votes or fair market value, and a buyout that concentrates ownership can change who belongs on that register even if it was accurate the day before. See legal diligence on a private Canadian corporation for the fuller corporate-records checklist.
STEP 09 OF 10
If the departing shareholder was also an employee or director, resolve resignation, release of director liability exposure, and any non-compete or non-solicit terms as part of the same closing — these do not resolve themselves automatically just because the shares changed hands. A director who resigns needs both a written resignation and a timely corporate filing to actually end their exposure; treating the share transfer and the governance exit as the same event is a common oversight.
STEP 10 OF 10
A share purchase between existing shareholders does not automatically trigger the GST/HST business-sale election mechanics that apply to an asset sale — treadstonelaw’s guidance on HST notes share sales are generally exempt from HST, which is a different starting point than the asset-sale election in ETA s. 167. Confirm with an accountant whether the remaining shareholder’s increased ownership stake has any consequence for the corporation’s own small business deduction eligibility or associated-corporation status before assuming nothing changes on the tax side.
No Canadian source publishes a typical buyout multiple, so treat the figures below as a hypothetical for arithmetic only, worked from the fixed-formula method treadstonelaw’s buy-sell guidance describes. Suppose two shareholders hold the company 50/50, and their shareholder agreement fixes the price at 4× trailing EBITDA, less net debt, split pro-rata by ownership. Trailing EBITDA is $520,000 and net debt is $180,000.
Enterprise value = 4 × $520,000 = $2,080,000. Equity value = $2,080,000 − $180,000 net debt = $1,900,000. The departing shareholder’s 50% share = $950,000.
Suppose the agreement also sets payment terms of 40% at closing and the balance over four equal annual instalments. Closing payment = 40% × $950,000 = $380,000. Remaining balance = $950,000 − $380,000 = $570,000, split over 4 years = $142,500 per year. Confirm before closing whether that note carries interest and what security, if any, backs it — the formula fixes the price, not the financing.
A voluntary sale between shareholders and a court-ordered buyout under s. 241 are not priced the same way, and the difference is not a technicality. A minority stake sold voluntarily is routinely discounted below its pro-rata share of the company’s value, reflecting the buyer’s lack of control. Treadstonelaw’s guidance is explicit that Ontario courts generally refuse to apply that same discount when ordering a buyout as an oppression remedy where majority conduct was unfair — the minority shareholder is made whole at full value precisely because they did not choose to sell on disadvantageous terms.
This is why a shareholder considering whether to negotiate or litigate should understand which forum they are actually in before setting a price expectation: a negotiated exit and a court-ordered one can land on meaningfully different numbers for the same shares.
Yes, a share redemption by the corporation is one common structure alongside a purchase by the remaining shareholder personally or through a holding vehicle — each carries different tax consequences, so confirm the choice with an accountant before closing.
Not necessarily. A shotgun clause lets one shareholder set the price and forces the other to buy or sell at it, per treadstonelaw's buy-sell guidance — but the shareholder setting the price still typically needs some valuation basis to set it credibly, even without a formal independent report.
That is exactly what an independent valuation clause in a shareholder agreement is meant to resolve in advance — see drafting a shareholder agreement for a buyout group for how to write that mechanism before a dispute exists rather than during one.
Legally it is still a share purchase and carries the same inherited-liability profile, but commercially it differs: there is usually no marketing process, no competing buyers, and often an existing shareholder agreement that already sets the mechanism — check that agreement first, per Step 1.
No new liabilities are created by the transfer itself — the corporation's obligations are unchanged before and after. What changes is the remaining shareholder's economic exposure to them, since a larger ownership stake now sits behind the same balance sheet.
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