The client
A borrower in the Orillia market took a five-year fixed in 2023, in the thick of the rate environment behind today's well-documented payment increases at renewal. Three years later, the mortgage matures, and the only real question is how much higher the new payment will be.
2023 origination
$460,000 at 5.14%
25-year amortization, illustrative rate
Payments made
36 months
Three years toward the original 25-year schedule
Personal income
$132,000/year
$11,000/month for the ratio math
Other costs
Tax $410/mo, heat $150/mo, car loan $410/mo
Counted alongside the new payment in TDS
The problem
Payment shock at renewal isn't really a rate story so much as an arithmetic one: a materially higher renewal rate is applied to a materially smaller remaining balance over a materially shorter remaining amortization — three forces that don't all pull the same direction, and a borrower usually only hears about the first one.
The three moving parts
- ▸Original payment, 2023: $460,000 at 5.14%, 25 years — $2,712/month
- ▸Balance remaining after 36 months of payments: $430,409, with 22 years left
- ▸Renewing at 5.79% over the remaining 22 years: $2,870/month
The gap is $158 a month, 5.8% higher — real money, but not the runaway increase “rates went up” headlines can imply once the smaller balance and shorter amortization are actually run through the math.
The numbers
There is no purchase price in a renewal file — the math starts from the balance still owing and the years left on the original schedule.
What three years of payments actually paid down
| Balance mechanics | Figure |
|---|---|
| Original mortgage, 2023 | $460,000 |
| Original contract rate (illustrative) | 5.14% |
| Original monthly payment | $2,712 |
| Months paid before renewal | 36 |
| Balance remaining at renewal | $430,409 |
| Amortization remaining | 22 years |
The renewal payment, and the shock
| Renewal math | Figure |
|---|---|
| New contract rate (illustrative) | 5.79% |
| New monthly payment, remaining balance over remaining amortization | $2,870 |
| Increase over the original payment | $158/month |
| Percentage increase | 5.8% |
The history of the stress-test qualifying rate is useful context for a cohort like this one, since the rate environment at origination and at renewal are rarely the same point on that history.
Does this borrower need to requalify?
Renewing with the same lender has never required a fresh stress test — that's not a new underwriting decision. Shopping it as an uninsured straight switch to a new lender, with no increase in the loan amount or amortization, would still qualify for OSFI's stress-test exemption for uninsured straight switches, effective since November 2024. So the number that actually decides this file is the $158 payment shock itself, not a requalification hurdle.
| TDS on the new payment | Monthly |
|---|---|
| New payment | $2,870 |
| Property tax | $410 |
| Heat (lender-standard estimate) | $150 |
| Car loan | $410 |
| TDS $3,840 ÷ income $11,000 → 34.9% | ✓ |
The solution
A mortgage agent's job on a file like this is mostly arithmetic and timing, not negotiation: quantify the actual increase before the conversation with the client, then decide whether renewing or switching gets the better outcome.
First, reamortized the remaining balance at the current renewal rate to produce an exact dollar and percentage increase, rather than letting the client anchor on the headline rate move alone.
Second, confirmed that shopping to a new lender, as an uninsured straight switch with no increase to the loan amount or amortization, would not trigger a stress test either — so the decision came down entirely to rate and service, not qualification risk. The current renewal wave is mapped more broadly in our look at where the 2026 renewal volume actually is.
The outcome
The client renewed with a clear, quantified number in hand instead of a vague sense that “rates went up” — a $158-a-month increase, comfortably inside a 34.9% TDS. No purchase and no transfer tax are part of this file; the entire decision lived in the balance, the rate, and the remaining amortization.
What to take from this file
- 01Payment shock is a function of three things — the new rate, the shrunk balance, and the shorter remaining amortization — not the rate increase alone.
- 02Renewing with the existing lender has never required a stress test. Only a switch can trigger one, and even then the uninsured straight-switch exemption often removes it.
- 03Quantify the actual dollar and percentage increase before the client conversation, not after the renewal notice has already anchored their expectations.
- 04A payment shock that comfortably clears TDS is still a payment shock. Budget for it regardless of whether the ratios pass.
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:
- ▸5.14% 2023 rate and 5.79% 2026 renewal rate — both illustrative; actual renewal rates are quoted at the time.
- ▸$410/mo tax and $150/mo heat estimates — lender-standard estimates, not rules.
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.