10 Legal Mistakes Ontario Small Businesses Must Avoid

1. Treating Limited Liability As Absolute

Incorporating creates a separate legal entity, and that separation is real. But small business owners routinely overestimate how much protection it gives them, because the two largest exceptions are the ones they encounter first.

Personal guarantees. Your bank will want one on the operating line. Your landlord will want one on the commercial lease. Your major supplier may want one on trade credit. Each signature moves that liability back onto you personally, and a guarantee on a five-year lease can outlive the business by years. Small business owners often sign several of these in their first eighteen months without registering that they have undone the thing they incorporated for.

Director liability. Directors of an Ontario corporation can be held personally liable for specific obligations regardless of the corporate structure, including unpaid employee wages and vacation pay, unremitted payroll source deductions, and unremitted HST. These are not theoretical; they are among the most common ways a director ends up personally exposed when a business fails.

Two practical consequences. First, read guarantees as personal documents, not corporate ones, and negotiate their scope and duration. Second, if the business is under financial pressure, source deductions and HST are the last things to fall behind on, not the first.

Setting aside these exceptions, Canadian courts are reluctant to look behind the corporate structure and hold shareholders liable for corporate debts. The threshold is high and the circumstances narrow. The realistic risk to your personal assets comes from what you sign and from the specific statutory liabilities above, not from imperfect record-keeping.

2. Choosing A Structure By Default Rather Than Deliberately

A sole proprietorship is you, carrying on business. There is no separate entity, so business debts and claims are your debts and claims.

A corporation is a separate legal person that owns its own assets, signs its own contracts, and carries its own liabilities, subject to the exceptions above.

“Incorporating will reduce my taxes.” Not automatically. A corporation earning active business income in Ontario may access a lower rate on income below a set threshold, which creates a genuine deferral advantage if profits are left in the company. If you draw everything out to live on, much of that advantage disappears. And corporate losses are trapped in the corporation, so an early-stage business losing money often does better unincorporated, where losses can offset other personal income. This is an accounting question as much as a legal one. Run the numbers with your accountant before incorporating for tax reasons.

“I have to have a Canadian resident director.” Ontario removed its director residency requirement in 2021. Older guides still repeat it.

The structure question also depends on whether you will bring in investors, whether you want to sell the business eventually, and what your liability profile actually looks like. A consulting business with no employees and no premises is in a different position from a contractor with a crew and a yard.

3. Calling People “Partners” Without Meaning It

This one is genuinely dangerous and almost never intentional.

In Ontario, a partnership can come into existence without any document being signed. Two or more people carrying on a business in common with a view to profit are a partnership, whatever they call themselves. And partners are generally jointly liable for the obligations of the firm, which means your business associate’s commitments can become your personal debts.

If you have incorporated, your co-owners are shareholders, not partners. If you have not incorporated and you are working with someone on a shared venture with shared profits, you may already be in a partnership you never agreed to. Either clarify the relationship in writing or incorporate.

The habit of using “partner” loosely in emails, pitch decks and LinkedIn bios is worth breaking. In a dispute, that language becomes evidence.

4. Operating Without A Shareholder Agreement

Incorporation documents say who owns the shares. They say almost nothing about what happens when the owners disagree.

A shareholder agreement is a contract among the shareholders governing how the company is run and how ownership can change. Without one, a 50/50 company where the owners stop agreeing has no mechanism to break the deadlock short of a court application, an expensive and destructive way to resolve a business disagreement.

At minimum, an agreement should address what happens when a shareholder wants out, dies, becomes disabled, gets divorced, or simply stops contributing; how shares are valued; who can buy them and on what terms; what decisions need unanimous approval; and how disputes are resolved. A unanimous shareholder agreement goes further, transferring some or all of the directors’ powers to the shareholders with corresponding liability.

The best time to sign one is when everyone still likes each other. Every shareholder agreement negotiated during a dispute costs several times what it would have cost at the outset, and produces a worse result.

Have co-owners and no agreement? That is the most common and most expensive gap we see in Ontario small businesses. H&H Law Group can be reached at (416) 572-7483.

5. Using Contracts That Do Not Reflect The Actual Deal

Downloaded templates fail in predictable ways. They are usually drafted under another jurisdiction’s law, they are neutral where your deal is not, and they omit the terms specific to your business.

For most Ontario small businesses the terms that matter are unglamorous: payment terms and what happens on late payment, a clear description of scope and what is excluded, who owns the intellectual property created under the contract, limitation of liability, confidentiality, termination rights, and the governing law and dispute resolution mechanism.

The intellectual property point deserves emphasis. In the absence of a written assignment, an independent contractor who develops software, designs, or written material for you may own the copyright in it, not you. Businesses discover this during due diligence on a sale, which is the worst possible moment.

A single well-drafted template for your recurring transaction type, prepared once for your actual business, usually costs less than one dispute and is reusable indefinitely.

6. Employment Agreements With Termination Clauses That Do Not Hold Up

This is the single most expensive employment mistake Ontario small employers make.

The Employment Standards Act, 2000 sets minimum notice and severance entitlements. It is a floor, not a ceiling. In the absence of an enforceable contractual term limiting an employee to those minimums, the employee is entitled to common law reasonable notice, which for a long-service or senior employee can run to many months of compensation, far beyond the statutory minimum.

The trap is that Ontario courts have repeatedly struck down termination clauses that fall short of the ESA in any respect, and a defect in one part of the termination language can invalidate the whole provision, including parts the employer never relied on. When that happens, the limit disappears and common law notice applies.

Ontario case law in this area is active and has continued to move through 2025 and 2026. A termination clause drafted five years ago may no longer be enforceable, and a clause that was vulnerable last year may be fine now. The practical instruction is simple: have your employment agreement template reviewed against current law, and review it periodically rather than once.

Separately, several Ontario obligations (written policies on electronic monitoring and disconnecting from work, and the job posting rules that took effect at the start of 2026) apply only to employers at or above a 25-employee threshold. Most small businesses sit below it, but businesses that grow across that line often do not notice when they cross it.

7. Calling An Employee A Contractor

Labels do not determine the relationship. Courts, the Ministry of Labour and the Canada Revenue Agency all look at the substance: who controls how and when the work is done, who provides the tools, whether the worker can profit or lose from their own management of the work, and how integrated the worker is into the business.

The consequences of getting it wrong run in several directions at once:

• CRA can assess unremitted source deductions, CPP and EI contributions retroactively, with interest and penalties, against the business.
• The ESA prohibits misclassification and places the onus on the employer to prove the worker is not an employee. Back entitlements to overtime, vacation and public holiday pay can follow.
• Courts recognise an intermediate category, the dependent contractor, who works primarily for one client and is entitled to reasonable notice on termination despite not being an employee.

A written contractor agreement helps but does not decide the question. If the working relationship looks like employment, the agreement will not save it. Structure the relationship first, then paper it.

8. Assuming A Registered Business Name Protects Your Brand

These are three different things and they do different work:

• Registering a business name in Ontario records that you are operating under that name. It confers no exclusive rights whatsoever. Someone else can register the same name.
• Incorporating under a name gives you that corporate name, but it is not a trademark and does not stop others from using a similar name in the market.
• A registered trademark under the federal Trademarks Act gives exclusive rights across Canada for the goods and services it covers. It is the only one of the three that actually protects a brand.

A NUANS search run at incorporation is not a trademark search. It will not tell you whether your name infringes an existing registered mark, which is how businesses end up rebranding after two years of building recognition.

Copyright in original work arises automatically, but ownership defaults matter: work created by an employee in the course of employment generally belongs to the employer; work created by a contractor generally does not, absent a written assignment. See point 5.

9. Letting Corporate Housekeeping Slide

Annual returns. Ontario corporations must file an annual return with the province. The filing process changed with the introduction of the Ontario Business Registry, and a number of corporations quietly fell out of compliance when the old route through the CRA closed. Persistent failure to file can lead to a corporation being cancelled, which is often discovered at the worst possible time, typically when trying to close a financing or a sale.

The minute book. Share certificates, directors’ resolutions, shareholder registers and annual approvals feel like paperwork until someone does due diligence on your business. A disorganised or incomplete minute book delays transactions, reduces buyer confidence, and sometimes costs real money in purchase price adjustments or holdbacks. Reconstructing a decade of missing records is far more expensive than maintaining them.

Neither of these is urgent in any given month, which is exactly why they get deferred for years.

10. Mixing Personal And Business Finance

Running personal expenses through the corporation and business expenses through a personal account creates problems that are financial and tax-related rather than liability-related.

Withdrawals that are not properly characterised as salary, dividends or a repayment of capital may be treated as shareholder loans, which carry their own tax rules and, if not repaid within the required period, can be included in your personal income. Personal expenses claimed as business deductions are a standard CRA audit finding. And a business whose books cannot cleanly distinguish personal from corporate spending is difficult to value, difficult to finance, and difficult to sell.

Separate accounts, a clear policy on owner compensation, and an accountant who sees the accounts regularly resolve most of this.

The One That Makes All The Others Worse

Calling a lawyer only once a dispute exists. By that point the options are constrained by decisions already made: a guarantee already signed, a contract already performed, an employee already terminated, a shareholder already deadlocked.

The preventive versions of everything above are modest, one-time costs. The reactive versions are open-ended.

Working with a business lawyer

H&H Law Group advises Ontario businesses on incorporation, shareholder agreements, commercial contracts, employment documentation, and business purchases and sales, from offices in Mississauga and Oakville, serving clients in Milton, Halton, Peel and across the Greater Toronto Area.

If you recognised two or three of these in your own business, that is normal and it is a reason to review them together rather than one at a time. Contact us to arrange a consultation.