The client
A household in Kingston, Ontario is renewing a $298,000 mortgage with their existing lender, six years into the original term — no increase to the balance, no change of lender, the simplest kind of renewal event there is.
Mortgage balance at renewal
$298,000
Kingston, six years into the original term
New contract rate offered
4.65%
Same lender, straight renewal
Combined income
$7,800/month
Both salaried
Other debt
$260/mo car loan
Unchanged throughout
What the letter got wrong
14 years remaining, not 19
A data error in the lender's own renewal system
The problem
Renewing with the same lender, on the same balance, is supposed to be the one mortgage event that doesn't require a second look: no new underwriting, no stress test, just a new rate applied to the existing schedule. This household's renewal letter still arrived with the wrong number on it, because the lender's own system had the remaining amortization wrong — 14 years instead of the true 19.
Same balance, same rate, two different payments
- ▸Renewal letter: 14 years remaining, $2,410/mo
- ▸Original mortgage's own amortization schedule: 19 years actually remained, $1,964/mo
- ▸Nothing about the loan itself changed between the two figures — only which remaining-term number the system used
This wasn't a rate dispute, and it wasn't a qualifying-rate question — there was no re-underwriting to argue about at all. It was a straightforward arithmetic error sitting inside a document the household would otherwise have had no reason to check against their own file.
The numbers
The fix required nothing more than the original mortgage documents and the actual payment history, laid alongside the renewal letter's assumptions.
| Same principal, same rate, two amortization assumptions | Amount |
|---|---|
| Mortgage balance at renewal | $298,000 |
| Payment at 14 years remaining (letter as received) | $2,410/mo |
| Payment at 19 years remaining (true, per the schedule) | $1,964/mo |
| Monthly difference | $446 |
| Total debt service | As first received | Corrected |
|---|---|---|
| Mortgage payment | $2,410 (14 years) | $1,964 (19 years, correct) |
| Property tax and heat | $400 | $400 |
| Car loan | $260 | $260 |
| Total debt service | 39.4% | 33.6% |
A same-lender renewal on an unchanged balance is not re-underwritten against a ratio ceiling the way a new purchase or a switch would be — these TDS figures are shown only to size how much the error would have cost the household's own budget, not to suggest either number was tested against a regulatory maximum.
The solution
A mortgage agent licensed under Ontario's Mortgage Brokerages, Lenders and Administrators Act treated the renewal letter as a document to verify, not a number to accept.
First, pulled the original mortgage documents and the full payment history. Six years of statements showed exactly how much principal had actually amortized, independent of anything the renewal system claimed.
Second, recalculated the true remaining amortization by hand. Nineteen years, not fourteen — a five-year discrepancy the lender's system had no obvious explanation for.
Third, took the corrected figure back to the lender's renewals desk with the schedule attached. Presented as a documented discrepancy rather than a dispute over the rate, the correction was processed before the client signed anything.
The outcome
The lender reissued the renewal letter at 19 years and $1,964 a month, once the discrepancy was documented and presented. Total debt service against the corrected payment came to 33.6%, versus 39.4% on the letter as first received — a $446-a-month difference on identical principal and an identical rate.
A same-lender renewal with no increase to the balance is not subject to a fresh stress test; these TDS figures are shown as household budgeting context, not as a regulatory pass/fail calculation.
What to take from this file
- 01A renewal letter is generated by a system, and systems carry forward data that can be wrong. The remaining amortization is exactly the kind of figure that can silently reset or drift between renewal cycles.
- 02Check the renewal letter against the original amortization schedule, not against memory. A five-year discrepancy is easy to miss if nobody pulls the original documents.
- 03A same-lender, same-balance renewal involves no stress test. This was a pure arithmetic question, not a qualifying-rate dispute — conflating the two wastes time arguing the wrong point.
- 04Present a documented discrepancy, not a complaint about the rate. A renewals desk can correct a data error quickly once it's shown the actual payment history; disputing the rate itself is a different, slower conversation.
- 05A data error can cost as much as a real rate increase would. $446 a month is a serious number for a household budget, whether it comes from a higher rate or from the wrong amortization typed into a system.
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.
- ▸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:
- ▸4.65% renewal contract rate — rates move daily; not a quote.
- ▸the TDS figures — informational only -- a same-lender renewal is not re-underwritten against a ratio ceiling the way a new purchase or switch would be.
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.