The client
An investor bought an older character home in a mature Edmonton neighbourhood, gutted it down to the framing and rebuilt it, then rented it out — financing the renovation through a private construction loan along the way.
Purchase price
$310,000
Renovation cost
$240,000, full interior gut and rebuild
Post-renovation appraised value
$650,000
Private construction loan balance
$460,000
Rent
$2,700/month, signed lease
The problem
The renovation was extensive enough that almost nothing of the original interior remained — new framing, new mechanical systems, new finishes throughout. Nobody on the file had connected that scope of work to a federal tax rule until the private lender’s payout deadline was approaching.
The rule the renovation quietly triggered
- ▸The Excise Tax Act treats a “substantial renovation” as 90% or more of a building’s interior removed or replaced, excluding certain structural components like the foundation and exterior walls — this renovation cleared that test comfortably
- ▸Under s.191, a person who substantially renovates a residential property and then rents it out is deemed to have sold and repurchased the property at fair market value the moment the first tenant is given possession — a self-supply, not a real sale, but taxed as if it were one
- ▸The GST is self-assessed on the property’s fair market value at that date, not on the purchase price or the renovation cost — on this property, that meant $650,000, not the $550,000 the investor had actually spent to acquire and rebuild it
The investor had budgeted for renovation costs and the private loan’s interest. Nobody had budgeted for a GST bill calculated on a number the property had never actually sold for.
The numbers
The refinance had to do two things at once: pay out the interim financing, and cover a federal tax bill neither the investor nor the private lender had planned for.
| What the post-renovation refinance had to cover | Amount |
|---|---|
| Private construction loan payout | $460,000 |
| GST self-assessed on $650,000 fair market value (5%) | +$32,500 |
| Total need | $492,500 |
| Post-renovation refinance | Figure |
|---|---|
| 80% LTV ceiling on $650,000 | $520,000 |
| New mortgage sized to | $500,000 |
| Total need (payout + GST) | $492,500 |
| Remaining for closing costs | $7,500 |
Alberta charges no provincial sales tax, so the GST obligation here is 5% of fair market value with no separate provincial component — and no new-housing rebate applies, since the property was never a builder’s new-home sale to a purchaser, but a self-supply the investor owes on their own renovation. Sizing the new mortgage at $500,000 covered both obligations with $7,500 left for closing costs, comfortably inside the 80% ceiling.
The solution
A mortgage associate regulated by RECA treated the renovation’s scope as a tax question the moment the file crossed the desk, not just a construction-cost question.
First, confirmed the renovation cleared the Excise Tax Act’s 90% substantial-renovation test against the actual scope of work completed.
Second, had the investor confirm the self-supply obligation and the GST calculation with their accountant before the first tenant took possession, since that possession date is what triggers the deemed sale.
Third, sized the post-renovation refinance to cover both the private loan payout and the GST remittance, rather than assuming the payout alone was the only number that mattered.
The outcome
The post-renovation refinance funded at 5.45%, uninsured, 80% LTV, sized at $500,000 to retire the private construction loan and cover the self-assessed GST, with total debt service at 35.1%.
Because this is an uninsured 80% LTV refinance, CMHC’s ratio maximums do not apply directly; the 35.1% figure reflects this lender’s own ceiling.
What to take from this file
- 01A gut renovation that clears the Excise Tax Act’s 90% test, followed by a rental, triggers a self-supply GST obligation — even without a formal building business. Flag the scope of any major renovation before assuming it’s purely a construction-cost question.
- 02The GST is assessed on fair market value at first-tenant-possession, not on the purchase price or renovation cost. On an appreciating property, that base can be substantially higher than what the investor actually spent.
- 03Confirm the self-supply obligation with an accountant before the first tenant moves in, not after. That possession date is what fixes both the tax trigger and the valuation date.
- 04Size a post-renovation refinance to cover interim financing and any tax obligation together. A refinance sized only to the private loan payout can leave a real, federal liability unfunded.
Sources
Every regulatory figure in this file traces to one of these primary sources. Client details and anything that varies by lender are illustrative, as flagged below.
- ▸OSFI — Minimum qualifying rate for uninsured mortgages — the minimum qualifying rate — greater of contract rate + 2% or 5.25%.
- ▸Provincial/territorial mortgage-broker legislation fetched directly (bclaws.gov.bc.ca, legisquebec.gouv.qc.ca, fcaa.gov.sk.ca, web2.gov.mb.ca, nslegislature.ca, assembly.nl.ca) plus FCNB's own site for NB and CanLII's index for PE — see notes for per-province method — provincial mortgage regulators and licence titles.
Illustrative in this file — lender-specific, not rules:
- ▸$650,000 post-renovation fair market value — appraisal-dependent figure specific to this property and renovation.
- ▸5.45% rate — rates move daily; not a quote.
Authority & provenance
How this case file was built
We publish the origin, the verification method and the reviewer for every case file, so you can judge how far to trust it before you rely on it with a client.
Where it comes from
Derived from files handled by Treadstone’s fulfillment desk and from scenarios contributed by partner brokerages. Names, employers, exact amounts and dates are changed so no client or file is identifiable.
Provenance: Composite — a pattern seen repeatedly on fulfilled files, not a single transaction.
What is verified
Every regulatory figure traces to a primary source listed above and was checked against it on the date shown. The arithmetic is recomputed by machine on every rebuild.
Anything that varies by lender is labelled illustrative rather than stated as a rule.
Who reviewed it
Reviewed for Canadian regulatory accuracy before publication, and re-checked whenever a cited rule changes.
Reviewed by: Nicholas Parson, Treadstone Associates — reviews every case file before publication.
This case file is professional reference material for licensed mortgage professionals. It is not advice to a borrower, and it is not a lender commitment. Insurer rules, qualifying rates and provincial taxes change — confirm the current position with the insurer, regulator or lender before you rely on any figure here in a live file.