The client
A borrower’s uninsured mortgage in Peterborough matured with a $520,000 balance and 22 years of amortization remaining, arriving in the middle of the heavier 2026 renewal wave. The new lender’s offer was materially better than a straight renewal with the maturing institution.
Existing mortgage
$520,000 balance, uninsured
22 years remaining amortization
Income
$9,500/mo combined
Car loan $380/mo
Switch structure
Same balance, no increase to amortization
No cash-out taken
New lender
Federally regulated institution
Contract rate 4.79%, 5-year fixed (illustrative)
The problem
A straight switch between two federally regulated lenders is, in OSFI’s own language, still a new mortgage from the receiving lender’s point of view — which would normally mean testing it at the minimum qualifying rate, not the contract rate.
What a normal new-mortgage stress test would have required
- ▸Qualifying rate: greater of 4.79% + 2% and 5.25% = 6.79%
- ▸Payment used for underwriting: $3,769/mo
- ▸TDS at that payment: ($4,199 housing + $380) ÷ $9,500 = 48.2%
48.2% is a heavier debt-service load than the file needed to show, on a borrower whose income and property haven’t changed at all since the mortgage was first advanced.
The numbers
Effective November 21, 2024, OSFI stopped requiring the minimum qualifying rate on an uninsured straight switch between two federally regulated lenders at renewal, provided the loan amount and remaining amortization don’t increase — exactly the shape of this file, and one reason renewal volume keeps climbing without a matching spike in stress-test declines.
| The two ways this switch could have been tested | Amount |
|---|---|
| Balance switched | $520,000 |
| Remaining amortization | 22 years |
| Contract rate offered | 4.79% |
| Minimum qualifying rate (if tested) | 6.79% |
| Renewal test | Payment | Housing costs | TDS |
|---|---|---|---|
| If tested at the qualifying rate | $3,769 | $4,199 | 48.2% |
| Exempt as a straight switch (actual contract rate) | $3,176 | $3,606 | 42.0% |
The $593-a-month gap between $3,769 and $3,176 is the entire effect of the exemption: same balance, same amortization, same borrower, tested at a materially lower payment because the switch meets both of OSFI’s conditions — no increase in loan amount or remaining amortization, and federally regulated lender to federally regulated lender.
The solution
An FSRA-licensed Ontario mortgage agent confirmed both conditions before submitting: the new balance would not exceed $520,000, the amortization would not extend past 22 years, and both the outgoing and incoming institutions are federally regulated. None of that changes the lender’s own underwriting — OSFI’s guidance is explicit that lenders must still assess the switch using sound B-20 principles — but it removes the prescribed stress-test rate from the file.
The submission notes documented the exemption basis directly — the same checklist our stress test calculation worksheet walks through — so the file did not need to justify a 48.2% TDS the borrower was never actually going to carry.
The outcome
The switch completed at the 4.79% contract rate, tested at that same rate rather than 6.79%. The borrower’s actual monthly payment of $3,176 is what both qualified the file and what hits the account — there is no gap between the qualifying payment and the real one here, which is itself a feature of the exemption, not a coincidence.
OSFI has also signalled it will revisit whether a Superintendent-prescribed minimum qualifying rate is still needed on new uninsured originations once its loan-to-income limit framework is fully phased in — a direction to watch, not yet a further rule change.
What to take from this file
- 01The exemption has two conditions, both must hold. No increase in loan amount or remaining amortization, and federally regulated lender to federally regulated lender — check both before assuming a switch qualifies for the exemption.
- 02Exempt from the rate test is not exempt from underwriting. OSFI still expects the receiving lender to apply sound B-20 judgment to income, credit and property — the exemption removes one specific rate hurdle, not the file review.
- 03Document the exemption basis in the submission. Showing the balance and amortization didn’t increase, and that both institutions are federally regulated, avoids the file being tested at the higher rate by default.
- 04The gap this avoids is real money. On this file it was $593 a month of qualifying-rate headroom the borrower never had to show.
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:
- ▸4.79% switch contract rate — rates move daily; not a quote.
- ▸the TDS comparison — this file is uninsured, so there is no CMHC ratio ceiling — the numbers show the stress-test gap the exemption avoids, not a regulatory pass/fail line.
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.