Limited Liability Partnerships in Ontario: Who Can Use an LLP and Why It Matters

If you are a lawyer, accountant, or other regulated professional in Ontario considering a partnership structure, the limited liability partnership (LLP) may be the most important business-structure concept you encounter. Unlike a general partnership — where every partner can be personally liable for the debts and negligent acts of every other partner — an LLP is designed to shield individual partners from liability arising from their colleagues' professional errors. But the protection has a narrower scope than many assume, and not every profession is permitted to use this structure.

This article explains the Ontario LLP: what it protects, what it does not, who can form one, and why the distinction matters before you sign a partnership agreement.

What Is a Limited Liability Partnership?

A limited liability partnership is a special form of partnership available under Ontario's Partnerships Act. It differs from both a general partnership and a limited partnership:

• General partnership: every partner is personally liable for all partnership debts and for the wrongful acts of any other partner acting in the ordinary course of the firm's business.
• Limited partnership: passive investors (limited partners) have capped liability, but general partners remain fully exposed.
• LLP: all partners remain active in management but receive cross-liability protection — meaning you are not personally responsible for professional negligence or misconduct committed by your partners without your involvement or knowledge.

Think of an LLP as "you are liable for your own mistakes, not your partners' mistakes" — with important exceptions discussed below.

What the LLP Shield Covers

In Ontario, the LLP liability shield generally protects a partner from personal liability arising from:

• Another partner's negligence, wrongful act, or omission in the course of the partnership's business.
• Another partner's misconduct or breach of professional duty that causes harm to a client or third party.

Example: If a partner at your accounting firm makes a serious error on a client's tax return that results in a large damages claim, the other partners who had no involvement in that file have some protection from personal liability for that specific claim. The partnership entity itself and the negligent partner remain exposed.

What the LLP Shield Does NOT Cover

The LLP does not eliminate all liability. Partners remain personally liable for:

• Their own negligence and professional errors — the LLP does not protect you from your own mistakes.
• Debts they personally guaranteed — signing a personal guarantee for a lease or bank loan remains binding.
• Acts in which they directly participated or authorized, even if committed by another partner.
• General trade debts of the partnership (e.g., office rent, supplier invoices) — LLP protection is narrower here and may not fully protect partners from ordinary commercial obligations depending on how the liability arose.

The exact scope of protection can be technical and fact-specific. Do not assume the LLP is a blanket liability shield.

Who Can Form an LLP in Ontario?

This is the critical restriction: not everyone can form an LLP in Ontario. The Partnerships Act limits LLP status to professions that are specifically authorized by their governing legislation or by the regulations of their professional regulator.

Professions Currently Permitted (as of writing — verify with your regulator)

• Lawyers and paralegals — permitted by the Law Society Act.
• Chartered Professional Accountants (CPAs) — permitted under the Chartered Professional Accountants of Ontario Act.
• Other regulated professions — additional professions may be added by regulation over time.

If your profession is not on the approved list, you cannot operate as an LLP under Ontario law, regardless of what your partnership agreement says. Using "LLP" in your firm name without authorization could constitute a misrepresentation.

Registration Requirements

To form an Ontario LLP, partners must:

1. Confirm their profession is authorized under applicable legislation.
2. Register the LLP name with ServiceOntario under the Business Names Act — the name must include "LLP" or "Limited Liability Partnership."
3. Comply with professional liability insurance requirements set by their regulator (lawyers must carry insurance through the Law Society's program; accountants have their own requirements).
4. Maintain the registration and update it when material information changes.

LLP vs Professional Corporation: A Quick Comparison

Many regulated professionals in Ontario can also incorporate a professional corporation (PC). The choice between an LLP and a PC involves trade-offs:

Many large law firms and accounting firms use LLPs precisely because the partnership model suits their governance needs while the LLP designation reduces cross-liability exposure among dozens of partners.

Frequently asked questions