- An unlimited liability corporation (often shortened to "ULC") is still a corporation — a separate legal entity that can own property, sign contracts, and sue or be sued in its own name.
- Ontario’s Business Corporations Act does not include an unlimited-liability option, and neither does the federal Canada Business Corporations Act.
- There isn’t a special policy reason Ontario "bans" unlimited liability corporations — it’s simply that the OBCA was drafted around the standard limited-liability model that applies to…
If you’ve been reading about cross-border deals or comparing incorporation options across Canada, you may have come across the term unlimited liability corporation — and noticed that it doesn’t seem to be something you can set up in Ontario. That’s not an oversight on your part. Ontario genuinely does not offer this corporate form, while a handful of other provinces do.
This article explains what an unlimited liability corporation actually is, why Ontario’s corporate statute doesn’t include one, and what Ontario businesses use instead to accomplish similar goals.
What Is an Unlimited Liability Corporation?
An unlimited liability corporation (often shortened to "ULC") is still a corporation — a separate legal entity that can own property, sign contracts, and sue or be sued in its own name. The difference from an ordinary corporation is narrow but important: if the ULC cannot pay its own debts, its shareholders can be called on to make up the shortfall, typically if the company winds up or becomes insolvent.
That single feature — shareholders standing behind the company’s debts — is the opposite of the limited-liability protection that draws most business owners to incorporate in the first place. Very few Ontario businesses would choose this structure for their day-to-day operating company.
Which Provinces Actually Offer This Structure
Ontario’s Business Corporations Act does not include an unlimited-liability option, and neither does the federal Canada Business Corporations Act. A small number of other Canadian provinces — commonly cited as Alberta, Nova Scotia, and British Columbia — provide a version of this structure under their own corporate statutes. Provincial corporate law changes over time, so if a ULC genuinely matters to your deal, confirm which provinces currently offer one, and under what conditions, before relying on it.
Why Ontario Never Built This Option Into the OBCA
There isn’t a special policy reason Ontario "bans" unlimited liability corporations — it’s simply that the OBCA was drafted around the standard limited-liability model that applies to virtually every Canadian business, and lawmakers never added a parallel unlimited-liability form the way a few other provinces did. The CBCA takes the same approach federally. If you incorporate in Ontario, or federally, you get the standard limited-liability corporate structure, full stop.
Why Would Anyone Want Unlimited Liability Anyway?
Given the obvious downside for shareholders, ULCs are used almost exclusively for a narrow purpose: cross-border structuring, typically where a U.S. parent company wants a Canadian subsidiary treated a particular way for its own U.S. tax purposes. This is a specialized, fact-specific area that depends heavily on U.S. as well as Canadian rules. If a cross-border deal or a U.S. parent is asking you to consider a ULC structure, that’s a conversation for cross-border tax counsel and your accountant, not something to work out from a general explanation like this one.
What Ontario Businesses Use Instead
| Structure | Owner liability | Typical use |
|---|---|---|
| Ordinary OBCA or CBCA corporation | Limited to what the owner invested (subject to guarantees and specific statutory exceptions) | The default choice for almost every Ontario operating business |
| Out-of-province ULC, registered extra-provincially to do business in Ontario | Unlimited, by design | Niche cross-border tax structuring, not ordinary operations |
| Sole proprietorship or general partnership | Personally unlimited, but for a different legal reason — there’s no separate corporate entity at all | Small, low-risk operations where the owner hasn’t incorporated |
A useful distinction: a sole proprietor or partner also has "unlimited liability," but that’s because there’s no corporation in the picture at all — a completely different situation from a ULC, which is a corporation whose shareholders happen to stand behind its debts. Don’t let the similar language cause confusion between the two.
If your business genuinely needs a ULC for a cross-border reason, the usual path is to incorporate it in a province that offers one, then register that corporation extra-provincially wherever it will actually carry on business, including Ontario. You don’t need — and can’t get — a ULC incorporated directly under Ontario law.
Frequently asked questions
Can I incorporate a ULC directly under Ontario law?
No. The OBCA does not offer an unlimited-liability corporate form, and the federal CBCA doesn’t either. You would need to incorporate in a province that offers this structure and, if you plan to operate in Ontario, register extra-provincially here.
Does an ordinary Ontario corporation ever expose shareholders to unlimited liability?
Not by default. Shareholders are protected up to what they invested. The main exceptions are personal guarantees an owner signs voluntarily (common in small-business financing) and certain narrow statutory director liabilities — neither of which turns the corporation itself into a ULC.
Is a ULC the same thing as a general partnership?
No, even though both can leave an individual on the hook for the entity’s debts. A ULC is still a separate corporation with its own legal existence; a general partnership isn’t a separate entity at all, and the partners’ liability arises for a completely different legal reason.
Should a small Ontario business ever consider a ULC structure?
For most ordinary Ontario operating businesses, no — the entire appeal of incorporating is limited liability, and a ULC gives that up. ULCs come up almost exclusively in cross-border tax planning involving a foreign parent, which calls for specialist advice rather than a do-it-yourself structure choice.
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