The client
A couple buying a legal duplex in Saskatoon planned to live in one unit and rent the other — a house-hack that has become more common as Canadian rental vacancy stays tight enough that a legal second suite rents itself. On their income alone, the purchase didn’t qualify. With the suite’s lease counted, it did — comfortably.
Borrowers
Couple, both salaried
$104,000/year combined
Purchase
$495,000 legal duplex, Saskatoon
Owner-occupied, one unit already tenanted
Down payment
$49,500 — 10%
Suite lease
$1,450/month, signed
50% add-back is this lender’s published treatment (illustrative)
Other debt
Car payment $480/month
First lender tried
Would not count any suite income
Treatment varies by lender on owner-occupied 2-unit purchases
The problem
On the buyers’ income alone, GDS runs to 41.3% — over the 39% insured cap — even with a tenant already in place, because the first lender they tried simply does not count suite income toward qualifying on an owner-occupied 2-unit purchase at high ratio. That is a lender-by-lender choice, not a rule.
The math without the suite
- ▸P&I at the qualifying rate ($3,074) + property tax ($358) + heat ($150) = $3,582/month in housing costs
- ▸$3,582 ÷ the buyers’ $8,667 income = 41.3% GDS — over the 39% ceiling
- ▸Declined at this lender, on the borrowers’ income alone, despite a signed lease already in hand
The frustrating part for the couple was that nothing about their own file had changed between the two lenders — same income, same debts, same signed lease, same legal duplex. What changed was entirely on the lender’s side of the desk: one underwriting workflow is built to read a subject-suite lease as qualifying income, and one simply isn’t, regardless of how well-documented the lease is.
It is also worth naming what did not happen here. Nobody asked the couple to inflate the lease, find a second tenant, or restructure the purchase as an investment property to make the numbers work. The property was already a legal duplex, the lease was already signed at a defensible market rate, and the only lever that moved was which lender’s published policy got to read that lease. That is a narrower, cleaner fix than most credit or income problems allow for, precisely because the underlying facts of the file were never in question.
The numbers
At 10% down this is an insured 2-unit owner-occupied purchase, structured through CMHC’s standard bands the same way a single-family purchase would be.
| Structuring the insured 2-unit purchase | Amount |
|---|---|
| Purchase price | $495,000 |
| Down payment (10%) | −$49,500 |
| Base mortgage (90% LTV) | $445,500 |
| CMHC premium — 3.10% in the 85.01–90% LTV band, capitalized | +$13,810 |
| Total insured mortgage | $459,310 |
| Rate & qualifying payment | Figure |
|---|---|
| Contract rate (illustrative, not a quote) | 4.49% |
| Minimum qualifying rate — greater of contract + 2% and 5.25% | 6.49% |
| Monthly P&I at the qualifying rate | $3,074 |
The suite, added to income rather than netted against costs
The mechanic here differs from a rental-offset on a non-subject property (see rental offset): on an owner-occupied subject property, this lender’s published policy is a straight add-back of half the lease to the income side, not a netting against the suite’s own carrying costs.
| Qualifying income | Monthly |
|---|---|
| Personal income | $8,667 |
| + 50% of the signed suite lease ($1,450 × 50%) | $725 |
| Qualifying income used | $9,392 |
| GDS / TDS with the suite counted | Monthly |
|---|---|
| Housing costs (unchanged from above) | $3,582 |
| $3,582 ÷ $9,392 → GDS 38.1% — under the 39% cap | ✓ |
| Car payment | $480 |
| $4,062 ÷ $9,392 → TDS 43.2% — under the 44% cap | ✓ |
The solution
An FCAA-licensed mortgage associate did three things.
First, diagnosed the decline as a suite-income policy question, not a borrower-quality one — the same signed lease was on the table both times.
Second, matched the file to a lender whose published policy adds 50% of a signed lease to income on an owner-occupied 2-unit purchase (illustrative — every lender and insurer sets its own treatment; the full landscape is mapped in our comparison of rental income offset methods).
Third, backed the lease with a market-rent appraisal addendum, so the lender’s own valuation corroborated the $1,450 figure rather than taking the lease at face value alone.
The order of these steps mattered. Shopping the file to a second lender before confirming why the first one declined would have risked repeating the same mismatch somewhere else; diagnosing the policy gap first meant every subsequent conversation with a lender started from the right question — does your policy count subject-suite income on an owner-occupied purchase, and if so, how — instead of resubmitting the same package and hoping for a different answer.
The outcome & the margin the suite bought
Funded insured at 10% down, 25-year amortization — the suite carried the entire margin between a 41.3% decline and a 38.1% approval. Saskatchewan’s 6% tax on the $13,810 insurance premium came to $829 in cash at closing, alongside land-title registration fees that were budgeted with legal costs rather than quoted as a fixed figure.
What to take from this file
- 01On an owner-occupied 2-unit purchase, whether suite income counts is entirely a lender policy question. This file swings from a 41.3% decline to a 38.1% approval on that one variable alone.
- 02A signed lease alone often isn’t enough. A market-rent appraisal addendum lets the lender’s own valuation corroborate the rent being claimed.
- 03Suite add-backs and rental offsets are different mechanics. One boosts the income side; the other nets against costs on the liability side — know which one a given lender actually uses.
- 04Saskatchewan is one of three provinces — with Ontario and Quebec — that taxes the default-insurance premium itself. Budget the 6% in cash, separate from the down payment.
- 05Minimum down payment tiers apply to a legal duplex the same way they apply to a single-family home when it’s owner-occupied. 10% here was a choice, not a requirement.
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.
- ▸CMHC — Purchase (Mortgage Loan Insurance) — default-insurance premium schedule by LTV band (25-year amortization).
- ▸CMHC — CMHC Home Start — minimum down payment tiers (5%/10%) and the $1.5M insured price cap.
- ▸OSFI — Minimum qualifying rate for uninsured mortgages — the minimum qualifying rate — greater of contract rate + 2% or 5.25%.
- ▸CMHC — CMHC Reviews Underwriting Criteria — GDS 39% / TDS 44% maximums and the 600 credit-score floor for insured files.
- ▸Government of Saskatchewan, Ministry of Finance — Information Bulletin PST-73, "Information for Vendors of Insurance Contracts" (Issued May 31, 2017) — 6% Saskatchewan PST on default-insurance premiums.
- ▸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:
- ▸50% suite add-back — subject-suite income treatment varies by lender and insurer.
- ▸4.49% contract rate — illustrative, 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.