You Gutted and Rebuilt It, Now You’re Selling: When a Resale Home Can Become a Taxable “New” House

Under the Excise Tax Act, the same rebuilt house can sell tax-free for one owner and attract HST for another. Three hypothetical sellers show where the line falls.

I’m Arthur Zhao, a real estate broker with AZ Real Estate Partners. Picture three houses on the same street, each stripped to the studs inside and rebuilt over the same year, each now listed for sale. From the sidewalk they look identical. Under the federal Excise Tax Act, they may not be. One sale can be exempt, one can be a taxable sale of a “new” house, and the third depends on what happened after the paint dried.

The three owners below are hypothetical — composites built to walk the statute, not real clients. For each one I’ll follow the same path through the Act: did the work reach the level the law calls a substantial renovation, is this person a builder, and which section of Schedule V does the sale land in. I won’t calculate tax or get into rebates; this is about whether HST is in the picture at all.

Before the three sellers: how “substantial” is measured

The Act defines a substantial renovation as one where all or substantially all of the building that existed before the work began has been removed or replaced — other than the foundation, external walls, interior supporting walls, floors, roof and staircases — and the result is still a residential complex.

Keeping the shell, the roof and the bearing walls does not keep you out of the definition; those elements are simply set aside when you measure. What gets measured is everything else inside: partition walls, ceilings, kitchens, bathrooms, wiring and plumbing runs, finishes.

According to the CRA’s Info Bulletin B-092 (2005), “all or substantially all” is generally read as 90% or more, and any fair and reasonable method can be used to measure it — share of floor space, floor and wall space together, or rooms (nine of ten rooms renovated is 90%). The same bulletin says plainly that neither the cost of the work nor the value it added is an acceptable basis. It describes a major renovation as one where “the interior of a building is essentially gutted”, and it lists patching drywall, painting and sanding a hardwood floor as things that are not removal or replacement at all.

Seller one: the owner who rebuilt the house to live in it

Our first hypothetical seller bought an older house, lived in it, and later took the interior back to the studs and rebuilt it for their own family. Say the work clears 90% on any reasonable measure. Does that make the eventual sale taxable?

Step through the definition of builder. Paragraph (a) of the definition in s.123(1) does reach a person who, while holding an interest in the property, carries on or hires someone to carry on the substantial renovation of a residential complex. On its own, that sounds like seller one. But the definition then carves out, in paragraph (f), an individual who does that work “otherwise than in the course of a business or an adventure or concern in the nature of trade.” An owner rebuilding their own home to live in fits that carve-out.

Where the sale lands. Not being a builder, seller one falls under section 2 of Schedule V, Part I: a sale of a residential complex by a person who is not a builder of it is an exempt supply. The main exception written into that section is where the seller claimed an input tax credit on buying the house or on an improvement to it.

So the depth of the renovation, by itself, did not change the answer for seller one. The reason for doing it did.

Seller two: the flipper

The second hypothetical seller bought a used house with the plan of gutting it, rebuilding the interior and reselling. They never lived there.

Builder? Yes, on the wording of the Act. The same paragraph (a) reaches them, and the paragraph (f) carve-out does not help, because the work was done in the course of a business or an adventure in the nature of trade. That is exactly the situation the carve-out leaves out.

Is there still an exemption? Section 2 is closed to them because it only covers sellers who are not builders. Section 4 of Schedule V, Part I is the one that can let a builder sell a single-unit house or a condo unit exempt, where the builder itself acquired the property in an exempt sale. But section 4 has its own exclusion: paragraph (c) switches the exemption off if, after the builder last acquired the property, the builder carried on or hired someone to carry on its substantial renovation. A gut-and-rebuild flip is the textbook case.

With no exemption available, the sale of seller two’s house is a taxable supply. In Ontario, the rate is 13%: 5% federal under s.165(1) of the Act plus Ontario’s 8% under Schedule VIII.

One contrast worth noticing: paragraph (a) of the builder definition only speaks to construction or substantial renovation. A flip that stays cosmetic — paint, flooring refinishing, some fixtures — doesn’t pull the flipper in through that paragraph. Whether any other part of the definition applies is a question of the specific facts, and it is one to put to a tax professional rather than assume.

Seller three: the flipper who ended up moving in

The third hypothetical seller started exactly like seller two: bought to renovate and resell, gutted the interior, rebuilt it. Then, once the work was done, they moved in and made it their home. Later they decide to sell.

Builder? On these facts, likely yes. The renovation was carried on as a flip, so the paragraph (f) carve-out for individuals does not obviously apply, and section 4 is switched off by the same substantial-renovation exclusion that caught seller two.

But Schedule V has a section written for this person. Section 3 makes exempt a sale by an individual who is a builder, where:

• at some point after the renovation was substantially completed, the house was used primarily as a place of residence of that individual, a related individual, or a former spouse or common-law partner; and
• between substantial completion and that point, the house was not used primarily for any other purpose.

As with section 2, the exemption is lost if the individual claimed an input tax credit on acquiring the property or on an improvement to it.

Two things the section does not say. It sets no minimum number of days or months of residence — it is simply not in the text. And it does not ask why you originally bought the house; it asks how the house was used once the work was finished. CRA’s B-092, in a related passage, describes “primarily” as generally meaning more than 50%. Whether a particular period of living there meets section 3 is a facts question for a tax professional.

The income tax flipping rule answers a different question

It is tempting to connect the HST question to the income tax rule on flipped properties, and the two are easy to blur.

Section 12(12) of the Income Tax Act deems a taxpayer who sells a housing unit held for less than 365 consecutive days (subject to listed life-event exceptions) to be carrying on an adventure or concern in the nature of trade with that property, so the gain is business income rather than a capital gain. The subsection opens with the words “For the purposes of this Act” — meaning the Income Tax Act.

The builder definition in the Excise Tax Act does not refer to that deeming rule. So the two laws run separately: one decides how your profit is taxed as income, the other decides whether the sale of the house carries HST. A sale can be caught by one and not the other. This article stays on the HST side.

Before you list a heavily renovated house

• Place yourself among the three sellers honestly. Why was the house bought, why was the work done, and how was it used after completion?
• Estimate the share of the interior removed or replaced using a method the CRA accepts — floor area, floor-and-wall area or rooms — not invoices or appraisal values.
• Check whether anyone claimed input tax credits on the purchase or on the renovation, for example through a contracting or property business. That alone can remove the section 2 or section 3 exemption.
• Get tax advice before the listing goes up, not after an offer arrives, so that the purchase agreement’s wording on HST matches the answer.