The client
A household in Gatineau, Quebec, carries a $310,000 mortgage maturing for renewal. One spouse, a federal public servant, is partway through an approved leave without pay, cutting combined income to $5,200/mo from a normal $8,800/mo for the duration of the leave.
Mortgage balance
$310,000, 18 years remaining
Stand-alone, uninsured mortgage
Maturing contract rate
5.60%
About to renew
New lender's switch offer
4.90%
Same balance, same amortization
Income, normal
$8,800/month
Both spouses working
Income, during the leave
$5,200/month
One income only, temporarily
The problem
A fresh mortgage application, tested against the reduced leave income at the minimum qualifying rate, would land at 61.6% total debt service -- decisively over the insured ceiling and nowhere close to what any lender's full underwriting would approve. But this file was never going to be treated as a fresh application.
What a genuine straight switch does and doesn't test
- ▸No increase to the $310,000 balance and no increase to the 18-year remaining amortization -- both conditions of OSFI's straight-switch exemption
- ▸Because both conditions are met, the new lender never applies the minimum qualifying rate at all
- ▸Because it is a switch, not a fresh origination, current income is not re-verified against the file's ratios -- the exemption tests the mortgage's payment history, not the household's present ability to pay
The household's actual leave-reduced income was never presented to the new lender, because a true straight switch never asks for it.
The numbers
Sizing the file correctly meant confirming, before relying on the exemption, exactly what a fresh application would have shown -- so the broker could be certain the exemption was doing real work, not papering over a file that would fail on its own merits.
| The exempt switch versus a fresh application | Amount |
|---|---|
| Mortgage payment at the maturing 5.60% rate | $2,270 |
| Mortgage payment at the switch lender's 4.90% | $2,154 |
| Monthly saving from the switch | $116 |
| Minimum qualifying rate on 4.90% | 6.90% |
| Payment a fresh application would test, at 6.90% | $2,492/mo |
| A fresh application, tested against leave income | Figure |
|---|---|
| Qualifying payment at 6.90% | $2,492 |
| Property tax and heat | $430 |
| Car loan | $280 |
| TDS ÷ $5,200 leave income | 61.6% |
A fresh underwriting file at 61.6% TDS is not a marginal decline -- it is not close. The exempt switch never ran this test at all, closing instead on payment history and the exemption's two mechanical conditions.
The solution
A courtier hypothécaire (mortgage broker) licensed under Quebec's Act respecting the distribution of financial products and services confirmed the exemption's conditions before relying on either of them.
First, confirmed the balance and amortization were both unchanged. No top-up, no extension -- exactly the $310,000 and 18 years the existing mortgage already carried.
Second, confirmed both lenders were federally regulated institutions. The exemption applies specifically to an uninsured straight switch between two such lenders, a distinction worth checking against a working reference like the stress test in 2026 rather than assumed.
Third, let the file proceed on payment history alone, without volunteering the leave. The new lender's application never asked for current income verification, so the reduced leave income was never part of the file at all -- a distinction from ordinary income verification practice worth understanding precisely.
The outcome
The switch closed at 4.90%, untested against the $5,200/mo leave income that would have sunk a fresh application outright. The household saved $116/mo against the maturing rate, with no re-verification of income at any point in the process.
The exemption tests the mortgage's own conditions, not the borrower's current ability to pay -- a broker's own professional judgment about affordability still matters even when the paperwork doesn't require it.
What to take from this file
- 01A genuine uninsured straight switch does not re-verify income at all. It tests two mechanical conditions -- balance and amortization -- not the household's current ability to pay.
- 02This is a real, valuable feature of the exemption, not a loophole to exploit blindly. A broker should still sanity-check affordability professionally, even when a lender's paperwork doesn't require it.
- 03A temporary income dip that would sink a fresh application doesn't touch an exempt switch. The two products test completely different things.
- 04Confirm both exemption conditions before relying on either. An unchanged balance and an unchanged amortization both have to hold, not just one.
- 05Know what a fresh application would have shown, even when you don't need to prove it. Understanding the counterfactual is what tells a broker whether the exemption is doing real work on a file.
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.
- ▸OSFI — OSFI exempts uninsured mortgage straight switches from the prescribed MQR and implements portfolio LTI limits — MQR exemption for uninsured straight switches at renewal (from Nov 21, 2024).
- ▸OSFI — Minimum qualifying rate for uninsured mortgages — the minimum qualifying rate — greater of contract rate + 2% or 5.25%.
- ▸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:
- ▸5.60% / 4.90% rates — rates move daily; neither is a quote.
- ▸the hypothetical fresh-application TDS — this file was never tested this way -- the figure exists only to show what a non-exempt application would have faced, not a real underwriting result.
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.