The client
A couple buying a home in Weyburn, Saskatchewan, with clean employment and income comfortably ahead of what the purchase needed. One applicant's bureau file carried a collection neither of them had opened.
Borrowers
Combined income $6,800/month
Both salaried, stable employment
Purchase
$245,000, Weyburn
Property tax $230/mo; lender heat estimate $110/mo
Down payment
$12,250 — 5%, the minimum at this price
LTV 95%, insured
Other debt
$260/mo car loan
the only other item on the bureau
The blocker
Bureau score 578
under CMHC's 600-score floor for an insured file
The problem
CMHC's underwriting sets a floor, not just a ceiling: at least one borrower or guarantor must show a bureau score of 600 or higher for the file to be insured at all. Income and ratios don't enter into that test — a strong file with a score under 600 is declined on the score alone.
What the 578 was made of
- ▸A store-card collection reporting at $2,150, opened without the borrower's knowledge or consent
- ▸Neither applicant had ever applied for or used the account
- ▸Combined with an otherwise clean file, this single fraudulent tradeline was the entire obstacle
Nothing else in the file was in question. Both borrowers had clean repayment history everywhere else, and income comfortably supported the purchase — mortgage-adjacent fraud doesn't have to touch the mortgage itself to derail a file; identity theft on an unrelated retail account did the damage here just as effectively.
The numbers
Structuring the loan first showed exactly how much room the file had once the score cleared — confirming the score, not the math, was the single point of failure.
| The insured loan | Amount |
|---|---|
| Purchase price | $245,000 |
| Down payment (5%, the minimum at this price) | −$12,250 |
| Base mortgage | $232,750 |
| CMHC premium at 4.0% (90.01–95% LTV band) | +$9,310 |
| Total insured mortgage | $242,060 |
| Ratio check at the qualifying rate | Figure |
|---|---|
| Minimum qualifying rate on a 4.79% contract rate | 6.79% |
| Payment at the qualifying rate, 25 years | $1,664/mo |
| GDS (payment + $230 tax + $110 heat) ÷ $6,800 income | 29.5% |
| TDS (GDS numerator + $260 car loan) ÷ $6,800 income | 33.3% |
29.5% and 33.3% sit well inside CMHC's 39% GDS and 44% TDS maximums, well within the range national credit-score statistics show for approved Canadian files — confirming the fraudulent collection, not the ratios, was the single point of failure on this file.
The solution
A mortgage broker licensed under Saskatchewan's Mortgage Brokerages and Mortgage Administrators Act treated the collection as a fraud problem, not a debt problem, from the outset.
First, confirmed neither applicant had any relationship to the account. No application, no purchase, no payment ever made — a genuine case of identity theft, not a forgotten or disputed-in-name-only debt.
Second, filed a police report and a formal identity-theft dispute with the credit bureau, rather than simply paying the $2,150 balance to make the score problem go away faster, similar to how a fraud alert discovered mid-deal has to be worked through rather than paid past. Paying a debt that isn't yours can read as accepting responsibility for it, and a paid collection stays on the file — a successfully disputed one comes off entirely.
Third, built in the weeks a fraud dispute actually takes to resolve, timing the pre-approval and the purchase closing around the bureau's investigation rather than the household's own preferred timeline.
It would have been faster, on paper, to simply pay the collection and move on. That path exists, but it would have left a fraudulent debt on the record as if it were legitimate, and settled for less than a genuine dispute and removal accomplishes. Taking the extra weeks kept the file, and the record, honest.
The outcome
The dispute succeeded, the fraudulent collection was removed, and the score cleared at 641. The insurer approved the file, and the purchase closed insured at 95% LTV with income, down payment and purchase price exactly as first submitted.
Saskatchewan applies no land transfer tax; the province's land-titles registration fees apply at closing but are not quoted here since the current fee schedule could not be independently verified.
What to take from this file
- 01CMHC's 600-score floor is a gate, not a ratio. A file can pass GDS and TDS with room to spare and still be declined outright on score alone.
- 02Dispute a fraudulent debt; don't pay it. Paying can read as accepting responsibility, and a paid collection still shows on the file — a successfully disputed one is removed.
- 03Confirm there's no relationship to the account before assuming fraud. A forgotten debt and a stolen identity look similar on a bureau printout; they are not the same problem.
- 04Build the dispute's timeline into the file, not around it. A bureau investigation takes real weeks; plan the closing date accordingly.
- 05Diagnose before you touch the file. Confirming the ratios were already comfortable meant the entire fix could focus on the one real obstacle.
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.
Illustrative in this file — lender-specific, not rules:
- ▸4.79% contract rate — rates move daily; not a quote.
- ▸578 / 641 bureau scores and the $2,150 fraud balance — illustrative anonymized figures; the 600-score insured-file floor is the regulatory fact.
- ▸$230/mo tax and $110/mo heat estimate — lender-standard estimates, not rules.
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.