The client
A couple had owned a three-season cottage near Owen Sound for years, using it themselves on weekends and in summer only. With Canada's rental vacancy rate holding tight nationally, they decided to winterize the property, sign a full-time tenant on a 12-month lease, and refinance to fund the upgrade and pay down other debt. The Owen Sound market supported the new post-winterization appraisal.
Borrowers
Salaried couple, both on T4s
Multi-year tenure with their employers
Combined gross income
$7,500/month
Used directly in the ratio math below
Existing mortgage
$210,000 balance
Before the refinance
New appraised value
$525,000
Post-winterization
New lease
$2,700/month
Signed 12-month, year-round tenant
Existing debt
$525/month auto loan
Carried in both scenarios below
The refinance itself, before any rental-income treatment enters the picture:
| Refinance structuring | Amount |
|---|---|
| Existing mortgage balance | $210,000 |
| New appraised value (post-winterization) | $525,000 |
| New mortgage at 80% LTV | $420,000 |
| Cash out to the borrowers | $210,000 |
The problem
This is not the more familiar pattern of keeping a second property as a rental while buying a new home elsewhere — here the cottage itself is the subject property being refinanced, and its own rental income has to carry its own mortgage. The couple's bank still applied a standard add-back policy: crediting only half the rent to income while carrying the property's full costs as a liability.
The add-back arithmetic
- ▸Income used: $7,500 + $1,350 (half of the $2,700 rent) = $8,850/mo
- ▸Liabilities: $3,418 full carrying cost + $525 car loan = $3,943/mo
- ▸TDS: $3,943 ÷ $8,850 = 44.6% — over the lender's ceiling. Declined.
The shape of the damage is familiar even on a subject property: the add-back grosses income up modestly ($1,350) while loading the full $3,418 carrying cost onto the liability side, even though the signed lease covers almost all of it in real life. The couple heard the decline and assumed the winterization plan was dead.
The numbers
The refinance qualifies at the minimum qualifying rate, not the contract rate, on the new $420,000 mortgage.
| Rate and payment | Amount |
|---|---|
| Contract rate — 5-year fixed (illustrative, not a quote) | 5.14% |
| Minimum qualifying rate — greater of contract + 2% and 5.25% | 7.14% |
| Monthly P&I at the qualifying rate — the ratios run on this | $2,978 |
| Monthly P&I at the contract rate — what they actually pay | $2,476 |
The $502-a-month gap between the qualifying payment and the contract payment is the stress test's entire purpose — it is never the amount that hits the bank account.
Full carrying cost on the subject property
| Carrying cost | Monthly |
|---|---|
| P&I at the qualifying rate | $2,978 |
| Property tax | $310 |
| Heat (lender-standard estimate) | $130 |
| Full carrying cost | $3,418 |
Same cottage, same lease, same borrowers — the only variable is which lender's rental-income policy applies. The 50% add-back and 80% offset compared here are illustrative of the two common structures; each lender publishes its own.
| TDS line | Bank A — 50% add-back | Lender B — 80% offset |
|---|---|---|
| Income used | $8,850 (incl. half of rent) | $7,500 (no rent added) |
| Full carrying cost / shortfall | $3,418 (full) | $1,258 (shortfall after offset) |
| Car loan | $525 | $525 |
| TDS | 44.6% ✗ | 23.8% ✓ |
Under the offset, the $2,700 rent is applied against the cottage's own $3,418 carrying cost before anything reaches the ratios; only the $1,258 shortfall lands in liabilities. The identical file swings 21 TDS points on the same lease and the same lender-standard estimates.
The solution
An FSRA-licensed Ontario mortgage agent diagnosed the decline the way any add-back case gets diagnosed: it was a statement about the bank's rental-income policy, not the borrowers' file. The fix was to shop the refinance to a lender whose published treatment offsets a subject property's own rent against its own carrying costs, mapped alongside the non-subject version of this pattern in our comparison of rental income offset methods.
The package went in complete, anticipating exactly what an offset lender needs to see on a conversion file:
What mattered to the lender was proof the conversion was real and complete — a signed lease, a post-renovation appraisal, and no personal-use carve-out left anywhere in the file — not a different set of borrowers or a bigger down payment.
The outcome
Approved and funded: a $420,000 cash-out refinance at 80% LTV, qualifying at 7.14% and paying 5.14%, on a 5-year fixed term.
| Refinance proceeds | Amount |
|---|---|
| New mortgage (80% LTV) | $420,000 |
| Less: existing balance discharged | −$210,000 |
| Cash out to the borrowers | $210,000 |
As a refinance rather than a purchase, no land transfer tax applies; legal, discharge, and appraisal fees were the only closing costs, quoted separately by the lawyer and paid from the cash-out proceeds.
What to take from this file
- 01A subject property's own rental income is not automatically treated like a second property's. The add-back vs. offset question applies just as hard when the property being financed is the one generating the rent.
- 02The refinance qualifies at the minimum qualifying rate, not the contract rate. This file qualifies at 7.14% and pays 5.14% — a $502-a-month gap between the ratio math and the actual payment.
- 03A cash-flow-positive rental can still fail on paper. The signed lease covers almost the entire $3,418 carrying cost, yet the add-back treatment still produced a decline.
- 04A conversion file needs proof the personal use has actually ended. A post-renovation appraisal and a signed year-round lease did more to move this file than any income document.
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:
- ▸5.14% contract rate — rates move daily; not a quote.
- ▸80% maximum LTV on the uninsured cash-out refinance — each lender sets its own maximum advance on an uninsured refinance.
- ▸50% add-back / 80% offset treatments — each lender publishes its own rental-income policy.
- ▸$310/mo tax and $130/mo heat estimates — lender-standard estimates, not rules.
- ▸44% TDS ceiling referenced for both lenders — on an uninsured file this is lender policy, not a regulatory maximum.
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.