The client
A newcomer buyer purchased a $372,000 home in Leamington at 10% down, with income and credit fully documented and unremarkable throughout.
Purchase price
$372,000, Leamington
10% down, insured
Buyer's own income
$8,200/month
Fully documented; never a point of concern
Other debt
$210/mo car loan
Contingency arranged
A private backstop lender, for timing only
The problem
The primary A-lender approval was routine but running close to the firm closing date, so the broker arranged a private lender as a contingency in case the documentation review ran long. Confirming details ahead of closing surfaced a problem with the backstop itself, not with the file.
What the contingency plan actually was
- ▸The private lender's own written lending criteria cover a defined geographic footprint
- ▸That footprint does not extend to this specific small-market address
- ▸The safety net the broker believed was in place would not actually have funded here at all
The newcomer's own file was never the risk. The backup plan for the file was.
The numbers
The A-lender approval was always going to clear these ratios on its own, consistent with the range first-time-homebuyer statistics show for a newcomer purchase at this down payment tier; the private contingency was for timing, never for the numbers.
| The insured purchase | Amount |
|---|---|
| Base mortgage (90% of purchase price) | $334,800 |
| CMHC premium (3.10% at 90% LTV) | +$10,379 |
| Total insured mortgage | $345,179 |
| Ratio check at the qualifying rate | Figure |
|---|---|
| Payment at the qualifying rate (6.90%), 25 years | $2,396/mo |
| GDS (payment + $310 tax + $120 heat) ÷ $8,200 income | 34.5% |
| TDS (GDS numerator + $210 car loan) ÷ $8,200 income | 37.0% |
34.5% and 37.0% sit comfortably inside CMHC's 39% GDS and 44% TDS maximums. Whether the private contingency's own geographic footprint reached this address was never going to change either number -- it only mattered if the A-lender approval had actually run late.
The solution
A mortgage agent licensed under Ontario's Mortgage Brokerages, Lenders and Administrators Act treated the private backstop's own coverage as a fact to verify, not an assumption to carry forward once it had been arranged.
First, confirmed in writing, with a second private lender whose own footprint does cover this market, that a genuine backstop actually existed before the closing date arrived -- rather than continuing to rely on a lender who could never have funded this address.
Second, followed up directly with the A-lender for its own written completion timeline, rather than treating the private contingency as the only lever available.
Third, kept both lenders' own terms current in the file so the correct contingency was ready to move on short notice, had the A-lender's own review actually run past the closing date.
The outcome
The purchase funded insured at 34.5% GDS and 37.0% TDS through the primary A-lender, on schedule; Ontario's land transfer tax on the $372,000 purchase came to $4,055.
The private contingency was never drawn on, but confirming its own geographic footprint before relying on it caught a gap that would only have mattered under time pressure.
What to take from this file
- 01A private lender's own geographic footprint is a fact to confirm, not an assumption to carry forward once a name is on file. Check it against the actual property address before counting on it as a backstop.
- 02A contingency plan needs the same diligence as the primary plan. A backstop that cannot actually fund the file is not a backstop at all.
- 03Not every newcomer file needs a private contingency, but a firm closing date against a routine documentation review often benefits from one. Confirm it works before the pressure arrives, not during it.
- 04A newcomer's own income and credit being unremarkable does not mean the file has no risk. Sometimes the risk sits in the backup plan, not the borrower.
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.
- ▸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.
- ▸Ontario.ca — Calculating Land Transfer Tax / Land Transfer Tax Refunds for First-Time Homebuyers — Ontario's marginal land transfer tax brackets and first-time-buyer refund.
Illustrative in this file — lender-specific, not rules:
- ▸4.90% contract rate — rates move daily; not a quote.
- ▸the private backstop lender's specific geographic footprint — each private lender sets its own territory; there is no published or universal boundary.
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.