Buying a Business With a Partner in Ontario: What to Agree on Before You Buy

Buying a business with someone else — a friend, a colleague, a spouse, a former co-worker — feels different from buying one on your own. You split the risk, the funding, and the workload. But you also inherit a second relationship to manage on top of the business itself, and that relationship needs its own ground rules.

Most co-buyers spend their energy negotiating with the seller and almost none negotiating with each other. That gap is where buying a business with a business partner goes wrong later — not because the deal was bad, but because nobody agreed in advance who decides what, who owns how much, and what happens if one partner wants out.

This article walks through the terms worth settling before you make an offer, not after you own the business together.

Why Co-Buyer Terms Belong Before Closing, Not After

When two or more people buy a business jointly, they typically hold their interest either directly as co-owners of purchased assets, or — more commonly — as shareholders of a corporation that buys the shares or assets from the seller. Either way, the purchase agreement with the seller governs the deal with the seller. It says nothing about how you and your partner will run things together afterward.

That second layer of agreement — between the partners — is usually a shareholder agreement (if you're incorporating together) or a partnership agreement (if you're operating as a general or limited partnership). Waiting until after closing to draft it is a common mistake: once the deal is done and the business is running, partners have far less incentive to compromise on hard questions like unequal contributions or an exit formula.

Four Questions to Answer Before You Sign an Offer

1. Who owns what percentage, and why?

Ownership split should reflect an explicit agreement, not an assumption. If one partner is contributing more cash, more of the personal guarantee on financing, or more industry expertise, decide up front whether that translates into a larger ownership share, preferred returns, or some other adjustment — and put the reasoning in writing so it isn't relitigated later.

2. Who is contributing what, and what happens if someone can't?

Map out cash contributions, personal guarantees on any loan or vendor take-back, and ongoing labour (will both partners work full-time in the business, or is one a silent investor?). Then address the harder question: what happens if a partner can't make a promised capital contribution, or stops working in the business? Unaddressed, this becomes one of the most common sources of partner disputes.

3. Who decides what, day to day?

Decide which decisions need unanimous partner agreement (selling the business, taking on major debt, hiring a family member) versus which can be made by whoever is running operations day to day. A 50/50 ownership split without a tie-breaking mechanism for deadlocked decisions is a recognized structural risk — it can freeze a business at exactly the moment a decision is needed.

4. How does a partner leave — voluntarily or not?

Eventually, someone may want to sell their share, may become unable to work due to illness, may pass away, or may simply want out. A shareholder or partnership agreement typically addresses this through:

• A right of first refusal — before a partner sells to an outsider, the remaining partner(s) get the chance to buy.
• A shotgun clause — one partner names a price; the other must either buy at that price or sell at it.
• Buy-sell provisions tied to death or disability, often funded by life or disability insurance so the remaining partner isn't forced to find cash on short notice.

Financing Considerations for Co-Buyers

Where partners are financing the purchase partly through a lender and partly through a vendor take-back (VTB) from the seller, lenders and sellers alike will usually want to know how the partners are structured and who is personally guaranteeing what. If one partner guarantees a loan and the other doesn't, that asymmetry should be reflected in how profits, losses, and exit proceeds are shared — not left as an informal understanding.

Personal guarantees also matter if the partnership later breaks down: a partner who has personally guaranteed financing may remain on the hook to the lender even after they've left the business, unless the exit terms specifically deal with releasing or replacing that guarantee.

A Short Pre-Offer Checklist

Before you and your co-buyer make an offer to a seller, work through this list together:

• [ ] Ownership percentages and the rationale behind them are agreed in writing.
• [ ] Cash contributions, guarantee obligations, and ongoing labour commitments are itemized.
• [ ] Decision-making authority — unanimous vs. majority vs. operator's call — is defined for major categories of decisions.
• [ ] A dispute-resolution or deadlock-breaking mechanism exists for a two-owner or evenly split structure.
• [ ] An exit mechanism (first refusal, shotgun clause, or similar) is drafted for voluntary departure, death, disability, and irreconcilable disagreement.
• [ ] Each partner has had the chance to get independent legal advice on the shareholder or partnership agreement before signing.

Frequently asked questions