The client
A household in Oshawa holds a $340,000 mortgage that was split, at origination, into two separate fixed-rate components on two different terms: $220,000 on a five-year fixed, and $120,000 on a three-year fixed, both uninsured, both registered as standard charges rather than a single collateral mortgage. $8,900/month of combined income services both without strain.
Component A
$220,000, 3.89%
The five-year fixed, maturing now
Component B
$120,000, 3.29%
A separate three-year fixed, not yet due
Combined income
$8,900/month
Both salaried
Other debt
$290/mo car loan
Unchanged throughout
The problem
The household's renewal notice arrived for Component A only, and their first instinct was confusion — where was the rest of the mortgage? Shopping or switching the full $340,000 balance, as if it were one maturing event, would have meant breaking Component B's separate three-year term early, with its own prepayment penalty, for no reason at all.
Why this wasn't one renewal event
- ▸Component A (five-year fixed, $220,000) matures now
- ▸Component B (three-year fixed, $120,000) has its own separate term and its own separate maturity date, years away
- ▸Only the component actually due needs a decision -- the other one keeps running exactly as registered
A maturity date belongs to a specific component, not to 'the mortgage' as a single undivided thing, and a multi-component product like this one can carry more than one at a time.
The numbers
Switching Component A alone changed one payment; Component B's own payment never entered the renewal conversation at all.
| Component A's switch, Component B unchanged | Amount |
|---|---|
| Component A balance | $220,000 |
| Component A payment at 3.89% (maturing rate) | $1,317/mo |
| Component A payment at 4.70% (new lender, straight switch) | $1,410/mo |
| Component B payment at 3.29% (unchanged) | $638/mo |
| Combined total debt service | Before the switch | After the switch |
|---|---|---|
| Component A payment | $1,317 | $1,410 |
| Component B payment (unaffected either way) | $638 | $638 |
| Property tax and heat | $510 | $510 |
| Car loan | $290 | $290 |
| Total debt service ÷ $8,900 income | 31.0% | 32.0% |
Component A qualified for OSFI's straight-switch stress-test exemption on its own: a stand-alone uninsured registration, moved dollar-for-dollar with no increase in balance or remaining amortization. It qualified at its own 4.70% contract rate, not the stress-test rate -- Component B was never part of that question, because it was never part of this renewal.
The solution
A mortgage agent pulled the original mortgage commitment before assuming the renewal notice described the whole balance.
First, confirmed each component's own balance, rate and maturity date. The original commitment letter showed the $340,000 had been split into two components from day one, each on its own separate term.
Second, switched only Component A, as its own stand-alone straight switch. Same $220,000 amount, same remaining 20-year amortization, moved to a new lender at 4.70% without a stress test, per OSFI's exemption for uninsured straight switches.
Third, left Component B registered exactly as it was. Its own three-year term still has time to run, and breaking it early to 'match' Component A's renewal would only have triggered a prepayment penalty the file had no reason to pay.
The outcome
Component A switched cleanly to a new lender at 4.70%, qualifying at its own contract rate under the straight-switch exemption. Component B continues at 3.29% until its own maturity date, untouched. Combined total debt service moved only from 31.0% to 32.0%.
Because both components are uninsured, CMHC's ratio maximums don't apply here; the total debt service figures are informational, showing how little the household's actual carrying cost changed.
What to take from this file
- 01A multi-component mortgage can carry more than one maturity date at once. A renewal notice for one component is not a renewal notice for the whole balance.
- 02Pull the original commitment before assuming what 'the mortgage' means. A product split into components at origination behaves like separate mortgages that happen to share a file.
- 03Don't break an untouched component to make a renewal feel simpler. Doing so trades a real prepayment penalty for nothing but a tidier-looking file.
- 04OSFI's straight-switch exemption applies component by component. A stand-alone uninsured piece can qualify at its own contract rate even while a sibling component sits untouched.
- 05Confirm whether each component is a stand-alone charge or a collateral registration. That distinction, not the renewal date, decides whether the exemption is even available.
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 — Minimum qualifying rate for uninsured mortgages — the minimum qualifying rate — greater of contract rate + 2% or 5.25%.
- ▸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).
- ▸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:
- ▸3.89% / 4.70% / 3.29% rates — rates move daily; none of these are quotes.
- ▸the original two-component split itself — how a lender structures a multi-component mortgage product is its own design; the specific split here is illustrative.
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.