The client
A household in Midland had one isolated 30-day-late mark on their credit report from 14 months earlier, tracing to a bank autopay glitch after a card renewal, clean before and since. They were buying for $410,000 with $41,000 (10%) down.
Purchase price
$410,000
Midland, 10% down
Late-payment marks
1
14 months old, isolated
Payment history since
Clean
Nothing before, nothing after
Combined income
$8,100/month
Both employed
The problem
A first, cautious read of this bureau file's credit score could easily treat the single late mark as evidence of generally bruised credit -- enough to steer the file toward a B-lender or a rate premium as a precaution. But the lender actually being used has its own seasoning policy: an isolated late payment, once it is aged past a look-back window and nothing else has followed it, is discounted rather than treated as a pattern.
Why this isn't a bruised-credit file
- ▸A bruised-credit file involves a genuine PATTERN -- several late marks, a collection, a consumer proposal -- something ongoing that changes how a lender prices risk
- ▸This file has exactly one dated event, traced to a specific, documented cause, with nothing before or after it
- ▸The distinction matters financially: a bruised-credit routing can mean a materially worse rate for no reason, on a file that was never actually higher-risk
The work here wasn't fixing anything -- there was nothing broken. It was making sure the file was read against the right policy instead of the more cautious default.
The numbers
Once correctly read, this file's numbers are exactly what a client with a spotless file would see -- because that's effectively what this file is.
| The insured purchase, at the standard rate | Amount |
|---|---|
| Purchase price | $410,000 |
| Base mortgage | $369,000 |
| CMHC premium — 3.10% at 85.01-90% LTV | +$11,439 |
| Total insured mortgage | $380,439 |
Qualifying payment at 6.85% (MQR on a 4.85% contract rate): $2,630/mo. GDS ($2,630 + $300 tax + $130 heat) ÷ $8,100 income = 37.8%. TDS (GDS numerator + $260 car loan) ÷ $8,100 = 41.0%. Both inside CMHC's maximums, at the same standard contract rate a client with no late-payment history at all would have received.
The solution
A mortgage agent read the file against the lender's actual seasoning policy rather than defaulting to a cautious, bruised-credit framing -- reading the credit bureau the way an underwriter actually would.
First, documented that the mark was singular -- nothing on the bureau before it and nothing since, across the full 14 months leading up to the application.
Second, obtained the bank's own confirmation that the late mark traced to an autopay processing issue at card renewal, rather than a genuine missed payment the client had simply let slide.
Third, submitted the file at the lender's standard rate, with the seasoning documentation attached, rather than pre-emptively routing it to a bruised-credit program the file never actually needed.
The outcome
The file funded at 4.85%, GDS 37.8% and TDS 41.0%, at the same pricing a client with no late-payment history at all would have received -- consistent with a mortgage arrears rate that treats an isolated, resolved event very differently from an ongoing one.
Each lender sets its own look-back window and materiality policy for a single dated blemish; not every lender treats an isolated late payment the same way.
What to take from this file
- 01One isolated, aged late payment is not the same thing as bruised credit. A pattern changes a lender's risk read; a single, explained event usually doesn't.
- 02Ask which lender's seasoning policy applies before defaulting to a cautious routing. The wrong assumption can cost a client a materially worse rate for no real reason.
- 03Document the isolation, not just the explanation. A bank's confirmation of the cause matters less than proof that nothing else has followed it.
- 04This is a different mechanic from a stale collection past its retention period. That's about a record disappearing from the bureau; this is about a lender's own policy for weighing a record that's still visible.
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:
- ▸4.85% contract rate — rates move daily; not a quote.
- ▸the seasoning policy discounting an isolated, aged late payment — each lender sets its own look-back window and materiality policy for a single dated blemish; not every lender treats it the same way.
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.