The client
A Windsor buyer with stable employment and clean repayment history on every account they were actively using ran into an unpaid medical bill from two years earlier, sent to a third-party collection agency without the client’s knowledge that it had escalated that far. Medical and utility collections are treated exactly like any other debt on a Canadian credit file, and this one alone was enough to push the score under the line that matters most for an insured purchase.
Credit picture
580, both bureaus
Driven down by a $4,200 medical-debt collection
Household income
8,200/mo
Car loan 350/mo
Purchase
$410,000, Windsor
Property tax 280/mo; heat estimate 110/mo
Down payment
$20,500 — 5% minimum
Insured file, 95% LTV
The problem
The ratios on this file were never in question — the obstacle was categorical, not arithmetic. CMHC requires at least one borrower or guarantor to hold a credit score of 600 or higher at the time insurance is requested; there is no ratio strong enough to offset a score below that line on an insured file.
The gate, not the math
- ▸Score with the collection outstanding: 580 — below CMHC’s 600 floor
- ▸GDS at the qualifying rate: 38.7%, TDS 43.0% — both already inside caps
- ▸Result: ineligible for default insurance regardless of the ratios, until the score clears 600
The client’s instinct was to dispute the collection outright, but the balance was genuinely owed — the faster path was paying it, not fighting it.
The numbers
At 5% down on a price under $500,000, the minimum down payment is a flat 5% of the purchase price — this file sits well under the $500,000 tier boundary where the blended 5%/10% rule would otherwise apply.
| Structuring the insured loan | Amount |
|---|---|
| Purchase price | $410,000 |
| Down payment (5%) | −$20,500 |
| Base mortgage (95% LTV) | $389,500 |
| CMHC premium — 4.00% in the 90.01–95% LTV band, capitalized | +$15,580 |
| Total insured mortgage | $405,080 |
| Rate & payments | Figure |
|---|---|
| Contract rate (illustrative, not a quote) | 4.79% |
| Minimum qualifying rate | 6.79% |
| Monthly P&I at the qualifying rate | 2,785 |
| Monthly P&I at the contract rate | 2,308 |
| Ratio | Figure |
|---|---|
| GDS | 38.7% |
| TDS vs. the 44% cap | 43.0% ✓ |
The solution
The FSRA-licensed mortgage agent pulled the full collection detail before advising anything, confirmed the balance was accurate and owed, then set out the fastest legitimate path to the 600 floor.
Paid the $4,200 collection in full rather than negotiating a settlement, since a paid-in-full status reports more favourably and faster than a partial settlement on most scoring models.
Waited for the update cycle and re-pulled credit once the collection agency reported the account as satisfied, confirming the recovery before resubmitting to the insurer.
The outcome & the closing math
With the score recovered to 640, the file cleared the 600 floor and the insurer approved the same ratios that had been sitting inside the caps the entire time.
| Cash due at closing (beyond the down payment) | Amount |
|---|---|
| Ontario land transfer tax on $410,000 | $4,675 |
| Ontario RST on the insurance premium — 8% × $15,580 | $1,246 |
| Legal fees, title insurance & adjustments | varies |
What to take from this file
- 01A single collection can be a hard gate, not a ratio problem. CMHC’s 600-score floor for insured files has no ratio-based exception.
- 02Medical and utility collections carry the same weight as any other debt on a Canadian bureau — there is no separate, gentler treatment for how the debt originated.
- 03Paid-in-full generally reports faster and more favourably than a negotiated settlement when time to close is the binding constraint.
- 04Verify a collection before advising a client to fight it. A genuinely owed balance is usually faster to resolve by paying it than by disputing it.
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 — CMHC Reviews Underwriting Criteria — GDS 39% / TDS 44% maximums and the 600 credit-score floor for insured files.
- ▸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%.
- ▸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.
- ▸Ontario.ca — Retail Sales Tax: Insurance and Benefits Plans — 8% Ontario RST on default-insurance premiums, cash at closing.
- ▸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:
- ▸4.79% contract 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.