The client
A buyer in Collingwood purchased a $358,000 home at 5% down, insured, having tracked their own credit for months through a free monitoring app.
Purchase price
$358,000, Collingwood
5% down, insured
App score
742
Shown by a free consumer credit-monitoring app
Lender's own score
614
The mortgage-specific model the lender actually pulled
Combined income
$7,700/month
The problem
Free consumer credit-monitoring apps license a scoring model built for consumer education, not mortgage underwriting. A mortgage lender's own bureau pull uses a different, mortgage-specific model -- built from the same underlying file, but weighted differently -- and the two numbers are not the same product.
What a 128-point gap actually meant
- ▸The app's 742 was a real number from a real scoring model -- just not the one any lender was going to rely on
- ▸The lender's own bureau pull returned 614, still comfortably above CMHC's 600-score floor for an insured file
- ▸Neither number was wrong. They were reading the same underlying credit file through two different, unrelated models
The client read the 128-point drop as evidence something had gone wrong in the weeks since they last checked. Nothing had.
The numbers
At the lender's own score -- the only one that actually governed this file -- the ratios were never close to a problem.
| The insured purchase, on the score that mattered | Amount |
|---|---|
| Base mortgage (95% of purchase price) | $340,100 |
| CMHC premium (4.00% at 95% LTV) | +$13,604 |
| Total insured mortgage | $353,704 |
| Ratio check at the qualifying rate | Figure |
|---|---|
| Payment at the qualifying rate (7.35%), 25 years | $2,554/mo |
| GDS (payment + $265 tax + $105 heat) ÷ $7,700 income | 38.0% |
| TDS (GDS numerator + $200 car loan) ÷ $7,700 income | 40.6% |
38.0% and 40.6% sit comfortably inside CMHC's 39% GDS and 44% TDS maximums, in the range Canadian mortgage credit-score data shows clears without difficulty. At 614, this file was never in danger -- the only real risk was the client walking away over a number that was never in play.
The solution
A mortgage agent licensed under Ontario's Mortgage Brokerages, Lenders and Administrators Act separated the two scoring products in writing before the client spent more time chasing what looked, on the surface, like a disputed credit item.
First, confirmed which scoring model the app licensed and which model the lender's bureau pull actually used. The two are built by different processes for different audiences, and a gap between them is normal, not diagnostic.
Second, confirmed the lender's 614 score in writing, well above CMHC's 600 floor, and walked the client through exactly why no dispute, paydown, or waiting period could -- or needed to -- close a gap that was never a data error.
Third, kept the file moving on its original timeline rather than letting a misunderstood number introduce a delay the file never actually needed.
The outcome
The purchase funded insured at 38.0% GDS and 40.6% TDS on schedule, once the client stopped chasing a 128-point gap that had nothing to do with the file the lender actually underwrote.
Both ratios sit comfortably inside CMHC's 39% GDS and 44% TDS maximums; the 614 score itself was never close to CMHC's 600 floor.
What to take from this file
- 01A free consumer app's credit score and a lender's own mortgage-specific bureau pull are different products. A gap between them is a model difference, not a data error to dispute.
- 02Confirm the lender's own score early, in writing. It is the only number that actually governs an approval -- not whatever a client's banking or monitoring app happens to show.
- 03A score gap this size can trigger real client anxiety even when nothing is wrong. A short, plain explanation up front prevents a self-inflicted delay.
- 04Do not let a client 'fix' a problem that doesn't exist. Disputing accurate accounts or rushing a paydown to chase a consumer-app number can create real complications for no real benefit.
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:
- ▸5.35% contract rate — rates move daily; not a quote.
- ▸the 742 / 614 scores and the 128-point gap — which consumer app and which bureau/scoring model a lender uses both vary; this file's own particular gap is not a universal figure.
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.