The client
A couple buying in Moose Jaw with clean employment and income comfortably ahead of what the purchase needed. One applicant's bureau file, however, carried a small utility collection from his former address — opened months after he had already moved out, by whoever took over the tenancy after him.
Borrowers
Combined income $6,400/month
Both salaried, clean repayment history everywhere else
Purchase
$250,000, Moose Jaw
Property tax $215/mo; lender heat estimate $100/mo
Down payment
$12,500 — 5%, the minimum at this price
Price is under the $500,000 tier boundary
Other debt
$300/mo car loan
the only other item on the bureau
The blocker
Bureau score 571
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, before the numbers are even discussed.
What was actually behind the 571
- ▸A small utility collection, reporting at the applicant's former address
- ▸Opened months after he had already moved out — by a new tenant at that address, not by him
- ▸The account had never legitimately been his, but it reported on his file exactly like any collection he genuinely owed
Nothing else in the file was in question. Both applicants had clean repayment history everywhere else, and the income comfortably supported the purchase — a single reporting error, not a real debt, was the entire obstacle. This is a different problem from the more familiar case where a genuine, small collection simply needs paying off, covered generally in what actually happens when a credit item is disputed mid-application.
The numbers
Structuring the loan first showed exactly how much room the file had once the score cleared — and confirmed the score, not the math, was the only issue.
| The insured loan | Amount |
|---|---|
| Purchase price | $250,000 |
| Down payment (5%, the minimum at this price) | −$12,500 |
| Base mortgage | $237,500 |
| CMHC premium at 4.0% (90.01–95% LTV band) | +$9,500 |
| Total insured mortgage | $247,000 |
| Ratio check at the qualifying rate | Figure |
|---|---|
| Minimum qualifying rate on a 4.75% contract rate | 6.75% |
| Payment at the qualifying rate, 25 years | $1,692/mo |
| GDS (payment + $215 tax + $100 heat) ÷ $6,400 income | 31.4% |
| TDS (GDS numerator + $300 car loan) ÷ $6,400 income | 36.0% |
31.4% and 36.0% sit well inside CMHC's 39% GDS and 44% TDS maximums — confirming the mistaken-identity collection, not the ratios, was the single point of failure on this file.
The solution
A mortgage broker licensed under Saskatchewan's Financial and Consumer Affairs Authority (FCAA) treated the score as a records problem, not a debt to pay.
First, traced the collection to its actual source. The utility account had been opened at the applicant's former address several months after his own lease ended — timing that didn't match his own tenancy at all.
Second, filed a formal dispute with the reporting bureau. Rather than pay an account he had never owed, the applicant initiated the bureau's own investigation process, supported by his lease-end date and forwarding address.
Third, obtained a confirming letter directly from the utility company. The utility's own records showed the account belonged to a different customer, and the company confirmed in writing that it had been opened after the applicant vacated — evidence the bureau's investigation could act on, explaining why a score can change materially between two pulls of the same file.
It would have been faster, on paper, to simply pay the small collection and move on. But paying an account never legitimately owed sets a precedent — and doesn't remove the risk of the same reporting error recurring. Disputing it took a few more days than paying it would have, but it fixed the actual problem rather than papering over it.
The outcome
The collection was removed — not paid — and the re-pulled score cleared at 646. The insurer approved the file, and the purchase closed insured at 95% LTV with the down payment, income and purchase price exactly as first submitted.
Because the account was found to belong to a different customer entirely, its removal fully cleared the applicant's record rather than leaving a 'paid collection' notation behind.
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.
- 02Not every collection on a bureau file is a real debt. A mistaken-identity or address-mixup account can report exactly like a legitimate one until someone checks the timing against the applicant's own history.
- 03A dispute is the right tool when the debt was never owed — a payoff is not. Paying an account that isn't legitimately the applicant's doesn't fix the underlying error and may not even be possible cleanly.
- 04Diagnose before you touch the file. Confirming the ratios were already comfortable meant the entire fix could focus on the one real obstacle instead of re-working numbers that didn't need 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 — 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:
- ▸4.75% contract rate — rates move daily; not a quote.
- ▸571 / 646 bureau scores — illustrative anonymized figures; the 600-score insured-file floor is the regulatory fact.
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.