The client
A salaried buyer purchasing a house near the Université du Québec en Outaouais in Gatineau, planning to live in the home while renting three bedrooms individually to students — a pattern that comes up often near any Canadian campus, and one where the tightness of Canadian rental vacancy makes room income a genuine, not marginal, part of the file.
Borrower
Salaried, owner-occupant
$4,833/mo income
New purchase
$310,000, Gatineau
Property tax $290/mo; heat estimate $120/mo
Down payment
$15,500 — 5%
Minimum down payment at this price
Room income
3 rooms × $650/mo = $1,950/mo
Signed individual room agreements
Documentation
12 months of e-transfer deposits
Matching each room agreement exactly
Other debt
Car loan $320/mo
Clean repayment history
The problem
Lender A’s policy on room-by-room boarder income was simple and absolute: without a single registered lease covering the whole property, none of it counts — not a discount, not a partial add-back, nothing. Three individual room agreements did not meet that bar in the lender’s eyes, regardless of how well documented they were.
Reading the file on salary alone
- ▸Housing costs at the qualifying rate: $2,143 P&I + $290 tax + $120 heat = $2,553/mo
- ▸GDS: $2,553 ÷ $4,833 = 52.8% — against CMHC’s 39% maximum
- ▸TDS: ($2,553 + $320 car loan) ÷ $4,833 = 59.4% — against the 44% maximum. Declined.
The $1,950/mo the rooms actually generate is real, deposited money — it just was not the kind of income Lender A’s published policy recognizes. That gap between real cash flow and what one lender’s policy will count is the same shape of problem behind most rental offset disputes, just applied to boarder income instead of a second property.
Per-room student rentals near any Canadian university sit in a genuine grey zone for lenders: the arrangement is neither a single formal tenancy the property manager can point to, nor pure undocumented cash. Each room agreement here was a written, signed contract between the owner and one student, renewed each September, with its own start and end date — distinct from a single lease covering the whole unit, but also distinct from an informal roommate-splits-the-rent arrangement with no paper trail at all. Lender A’s policy did not distinguish between those two very different situations; the broker’s job was to find a lender whose policy did.
The numbers
First, the loan itself. At 5% down this is an insured file at the top LTV band, so CMHC’s 39%/44% caps are hard numbers and the room income either clears the file or it does not.
| Structuring the insured purchase | Amount |
|---|---|
| Purchase price | $310,000 |
| Down payment (5%) | −$15,500 |
| Base mortgage (95% LTV) | $294,500 |
| CMHC premium — 4.00% in the 90.01–95% LTV band, capitalized | +$11,780 |
| Total insured mortgage | $306,280 |
Minimum qualifying rate is 6.99% against a 4.99% contract rate (illustrative, not a quote). Monthly P&I at the qualifying rate is $2,143; at the contract rate, $1,780.
GDS and TDS with and without the room income
| Ratio | Salary only ($4,833/mo) | Salary plus rooms ($6,783/mo) |
|---|---|---|
| Housing costs (GDS numerator) | $2,553 | $2,553 |
| Car loan | $320 | $320 |
| GDS vs. the 39% cap | 52.8% ✗ | 37.6% ✓ |
| TDS vs. the 44% cap | 59.4% ✗ | 42.4% ✓ |
The three room agreements at $650/room/month add exactly $1,950/mo to the income side once a lender is willing to count them — $4,833 plus $1,950 is $6,783/mo, and that single change is the entire distance between decline and approval.
Quebec’s transfer duty on $310,000 comes to $2,786, plus a 9% Quebec tax on the $11,780 premium ($1,060) — both cash at closing, on top of the down payment.
The solution
A courtier hypothécaire licensed under the AMF re-shopped the file rather than re-arguing it with Lender A. From the lenders on the broker’s shelf, the search targeted one whose published policy counts documented per-room income at a stated percentage, provided the paper trail is complete.
Built the documentation Lender A never had a chance to see. Each room agreement was matched to twelve months of e-transfer deposits landing on the dates and in the amounts the agreement specified — not estimated, not averaged, matched line by line.
Confirmed the counting policy before submitting. Lender B’s policy on this file counted 100% of the documented room income; that figure is illustrative and lender-specific — other lenders on the same shelf discount it, and the broker checked which one applied before building the ratios around it.
Packaged the full comparison. The submission included both readings of the file side by side, so the underwriter could see exactly why the first decline happened and why this one should not repeat it.
Kept the room agreements current. With a new academic year approaching, the broker confirmed each agreement would be renewed on comparable terms before closing, rather than relying on room agreements that would themselves expire within months of funding.
The outcome & the closing math
Approved and funded: insured at 95% LTV, 25-year amortization, 5-year fixed term, with the room income fully counted. GDS landed at 37.6% and TDS at 42.4%, both inside the caps with real, if not enormous, room to spare.
| Cash due at closing (beyond the down payment) | Amount |
|---|---|
| Quebec transfer duty (“welcome tax”) on $310,000 — 0.5% / 1.0% / 1.5% marginal brackets | $2,786 |
| 9% Quebec tax on the $11,780 CMHC premium — the premium is capitalized, the tax on it is not | $1,060 |
| Legal fees, title insurance & adjustments | varies |
The lender also required proof of funds covering closing costs beyond the $15,500 down payment, satisfied from the same account history.
What to take from this file
- 01Know each lender’s room-and-boarder-income policy before you pick the lender. On this file, the identical arrangement swings GDS by fifteen points depending purely on which lender reads it.
- 02Real cash flow and a lender’s countable income are not the same thing. $1,950/mo of documented deposits was worth $0 to one lender and 100% of face value to another.
- 03Match every agreement to a deposit, not an average. Twelve months of exact line-by-line matches is what turns a boarder arrangement into documented income.
- 04Confirm the counting percentage before you build the ratios around it. Lender policy on room income is illustrative and varies; do not assume 100%.
- 05Budget the Quebec insurance-premium tax separately from the transfer duty. On this file the two add $3,846 in cash before legal fees, and neither can be rolled into the mortgage.
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.
- ▸Gouvernement du Québec — Droits sur les mutations immobilières — Quebec's transfer duties ('welcome tax') — 2026 indexed brackets.
- ▸Act respecting the Québec sales tax, CQLR c. T-0.1, Title III ("Taxation of Insurance Premiums"), ss. 507, 512, 520 — Quebec's 9% tax on insurance premiums (rising to 9.975% in 2027).
- ▸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:
- ▸4.99% contract rate — illustrative, not a quote.
- ▸100% of documented per-room income counted — each lender sets its own threshold for boarder/room income.
- ▸$650 per-room rent figure — market rent varies by unit, city and lease.
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.