Commercial Activity for Canadian GST/HST: The Three Branches

Under subsection 123(1) of the Excise Tax Act, the commercial activity definition for Canadian GST/HST purposes has three branches: carrying on a business, engaging in an adventure or concern in the nature of trade, and supplying real property. If what you do fits any one of them — and isn’t an exempt supply — you’re in the GST/HST system. That means you collect tax on your sales and can recover the tax you paid on business purchases through input tax credits. If nothing you do qualifies, you stay outside the system entirely, and the tax you pay on your own inputs becomes a permanent cost.¹

The Three Branches

Each branch catches a different kind of economic participation, and any one of them is enough on its own.

Carrying On a Business

This is the broadest branch. A continuing operation that sells goods, provides services, or works a trade is carrying on a business. “Person” for this purpose includes individuals, corporations, partnerships, and trusts.

An Adventure or Concern in the Nature of Trade

The second branch catches one-off transactions that look commercial even when the person doing them has no ongoing business. Flipping a piece of land, or buying inventory for resale at a profit, can trigger GST/HST obligations from a single deal.

Supplying Real Property

Selling or leasing real property is commercial activity on its own footing, whether or not you’re in the real estate business — unless the specific transaction is an exempt supply, such as the resale of a previously occupied home by someone who isn’t a builder.

Each branch carves out exempt supplies. To the extent an operation makes exempt supplies (long-term residential rentals, most health care, financial services), that portion sits outside commercial activity even when the rest of the operation is fully taxable.¹

When a Single Transaction Counts as an Adventure in the Nature of Trade

The second branch is the one that surprises people. A single deal can pull you into GST/HST, and none of the following facts protects you: that the transaction was a one-time event, that you didn’t set up an organization to do it, or that you’ve never done anything similar before or since.²

The Canada Revenue Agency weighs all the circumstances, and no single factor decides the question. The main tests track whether you behaved the way a dealer in that type of property would behave.

Your conduct. Did you buy and resell quickly? Did you take steps to improve the property’s marketability? Did you advertise or seek buyers the way a professional would? A fast turnaround points strongly toward a trading intention.
The nature of the property. If it can’t produce income or personal enjoyment on its own — undeveloped land, for instance — the CRA presumes it was bought for resale. The same reasoning applies to property that needs specialized operation, such as a commercial vessel, if you have no ability to operate it.
Your intention. Wanting to sell at a profit isn’t enough by itself, because investors want profits too. But when other factors point to trading, a plan to sell at the first good opportunity becomes supporting evidence. The CRA also looks at whether you had a secondary intention to sell if your primary plan fell through.

Your background matters as well. Someone with real estate development experience buying and flipping a property faces a steeper argument that the deal was purely personal.²

The Reasonable Expectation of Profit Filter

The first two branches contain a built-in filter. Activities carried on “without a reasonable expectation of profit” by an individual, a personal trust, or a partnership all of whose members are individuals are excluded from commercial activity.¹ The filter keeps hobbies and personal pursuits out of the tax system.

The CRA evaluates profit potential by looking at the time devoted to the activity, the intended course of action for generating income, the capability to show a profit given the nature of the activity, and the track record of income and losses.³ Significant hours, a business plan, and rising revenue over time make a strong case. Losses year after year with no adjustments to the model do not.

Corporations are not subject to this test. Their legal existence is treated as inherently commercial. Personal trusts, however, are subject to it. A common misconception is that all trusts get the same exemption corporations do; the statute explicitly applies the profit test to personal trusts.³

Failing the profit test means the activity is personal. You cannot register for GST/HST, you cannot claim input tax credits, and you cannot use hobby-related losses to generate refunds from the CRA.

Why the Classification Matters: Taxable, Zero-Rated, and Exempt

Falling inside commercial activity is what unlocks input tax credits. Falling outside it is what locks them away. The three-way split among taxable, zero-rated, and exempt supplies is where this plays out, and mixing up zero-rated and exempt is one of the most common GST/HST mistakes.

Taxable Supplies (Standard-Rated)

Standard-rated supplies cover most retail goods, professional services, and intangible property. The rate depends on where the supply is made. In provinces without a harmonized tax (Alberta, British Columbia, Manitoba, Saskatchewan, and the territories), only the 5% federal GST applies. In participating provinces, the HST combines the federal and provincial portions: 13% in Ontario, 14% in Nova Scotia, and 15% in New Brunswick, Newfoundland and Labrador, and Prince Edward Island.⁴ Nova Scotia’s rate dropped from 15% to 14% on April 1, 2025.⁵

Zero-Rated Supplies

Zero-rated supplies are taxable at 0%. No tax is collected from the buyer, but the activity still counts as commercial. That distinction is the point. Schedule VI of the Excise Tax Act lists these categories, and the major ones include basic groceries, prescription drugs, and goods exported from Canada.⁶ Because zero-rated suppliers are still conducting commercial activity, they can register and claim input tax credits to recover the tax they paid on their own inputs. A pharmacy that fills prescriptions still recovers the GST/HST on its rent, equipment, and supplies.

Exempt Supplies

Exempt supplies are the opposite. When a supply is exempt under Schedule V, it sits outside commercial activity entirely. You don’t charge GST/HST, and you generally can’t recover the tax you paid on inputs.⁷ The major exempt categories are:

Residential property: long-term residential rentals (one month or more), residential condo fees, and the resale of previously occupied housing.⁸
Health care: most medical, dental, and nursing services performed by licensed practitioners, including optometrists and midwives. Psychotherapists and counselling therapists were recently added.⁹
Financial services: lending, deposit accounts, and insurance policies.
Educational services: vocational training leading to certification, tutoring in courses approved by a school authority, and music lessons.
Child care: services where the primary purpose is caring for children 14 and under for less than 24 hours per day.

A business that makes only exempt supplies generally cannot register at all, with a narrow exception for listed financial institutions resident in Canada.⁷ The tax absorbed on inputs becomes a real cost of doing business. A dentist pays GST/HST on equipment and office supplies and can never claim credits to recover it.

Real Property: The Branch That Creates the Most Traps

Real property has its own branch in the definition, and the rules here cause more errors than any other area of GST/HST. Selling real property is commercial activity unless the transaction is exempt, and the exempt category is narrower than most people assume.

The main exempt real property transactions are the sale of a previously occupied residential home by someone who isn’t a builder, and long-term residential rentals of one month or more.⁸ New homes, substantially renovated homes, and commercial properties are all taxable on sale. Property held as inventory for resale falls squarely inside commercial activity, triggering registration and tax collection.

Self-Supply and Change-in-Use

When a builder constructs or substantially renovates a residential complex and then rents it out or moves in personally instead of selling it, the law treats that as a deemed sale and repurchase at fair market value. The builder owes GST/HST on the deemed sale.¹⁰ Without this rule, a builder could construct a home, rent it or live in it, and never pay tax on the value added through construction — an unfair advantage over someone buying from a builder.

Change-in-use rules work similarly. Converting non-residential property to residential use can be treated as a substantial renovation, which makes you a builder and triggers the self-supply rules. Pulling commercial real property out of commercial activity for personal use is treated as a sale at fair market value, and you must account for the GST/HST.¹⁰

There are exceptions. An individual builder who uses the complex primarily as their own residence and never claimed input tax credits on the construction is not subject to self-supply. Universities and public colleges building student residences, and communal religious organizations building housing for their members, also get carve-outs.¹⁰ When a taxable deemed sale does occur, an input tax credit is available for the tax previously embedded in the property, to prevent double taxation.

Being in Commercial Activity Does Not Automatically Mean You Must Register

Qualifying as commercial activity is the gateway, not the trigger. Canada’s small supplier exemption keeps low-revenue operators out of the filing system until they cross a revenue threshold.

For most businesses, the threshold is $30,000 in worldwide taxable supplies. You remain a small supplier as long as your total taxable revenue (including revenue from associated persons) doesn’t exceed $30,000 in any single calendar quarter or over the last four consecutive calendar quarters. Once you exceed it, you must register.⁷

Public service bodies, including charities and public institutions, get a higher threshold of $50,000 in taxable supplies. Charities also have a separate gross revenue test: they remain small suppliers if their gross revenue was $250,000 or less in either or both of the two preceding fiscal years.⁷ One exception: self-employed taxi and commercial ride-sharing drivers must register regardless of revenue.

Even below the threshold, voluntary registration is available. It lets you charge GST/HST and claim input tax credits on your business purchases. For a business selling primarily to other registrants who recover the tax through their own credits, voluntary registration recoups the tax embedded in your costs without meaningfully affecting your customers. The trade-off is compliance: once you register voluntarily, you must charge and collect tax on your taxable supplies, file on schedule, and stay registered for at least one year before you can cancel, unless you stop all commercial activities.¹¹

1
Justice Laws Website. Excise Tax Act – Section 123
2
Canada Revenue Agency. IT-459 – Adventure or Concern in the Nature of Trade
3
Canada Revenue Agency. Application of Profit Test to Carrying on a Business
4
Canada Revenue Agency. Charge and Collect the GST/HST
5
Canada Revenue Agency. Nova Scotia HST Rate Decrease – Questions and Answers on General Transitional Rules for Personal Property and Services
6
Department of Justice Canada. Excise Tax Act – Schedule VI
7
Canada Revenue Agency. When to Register for and Start Charging the GST/HST
8
Department of Justice. Excise Tax Act – Schedule V – Exempt Supplies
9
Canada Revenue Agency. General Information for GST/HST Registrants
10
Canada Revenue Agency. Residential Real Property – Deemed Supplies
11
Canada Revenue Agency. Register Voluntarily for a GST/HST Account