The client
A Toronto household's $340,000 mortgage is maturing for renewal, and a competing lender's straight-switch offer of 4.95% looks like an easy win over the current bank's 5.45% renewal quote. The mortgage itself is a stand-alone charge with nothing blocking a clean switch — but the same bank also holds a $45,000 home equity line of credit against the property, opened in 2018 at a promotional rate the bank has not offered a new customer since.
Mortgage balance
$340,000, 21 years remaining
Stand-alone charge, cleanly switchable
Current lender's renewal offer
5.45%
The quote that started this conversation
Competing switch offer
4.95%
From a different federally regulated lender
HELOC balance
$45,000, drawn
Same bank, registered against the same home
HELOC's 2018 rate
4.45%, promotional
No longer offered to new HELOC customers
The problem
On the mortgage alone, the math is straightforward: $93 a month cheaper at the competing lender's rate, for an identical $340,000 balance carried over the same 21 years remaining. What that comparison leaves out entirely is the HELOC — a separate product, registered against the same home, priced years ago under a promotion the bank does not run anymore.
What actually changes if the mortgage moves
- ▸The mortgage itself switches cleanly -- a stand-alone charge, no collateral-charge complication, eligible for the straight-switch exemption
- ▸The HELOC's 2018 promotional rate is tied to the banking relationship, not to the mortgage's own registration -- this bank reprices a HELOC to current terms once the mortgage anchoring that relationship leaves
- ▸Nothing about the HELOC's $45,000 balance changes; only the rate charged on carrying it does
Priced on its own, the mortgage switch is a clear $93-a-month win. Priced next to what the same move does to the HELOC, the picture looks very different -- and a rate-comparison spreadsheet built around the mortgage alone was never going to surface that.
The numbers
Running both products side by side, not just the mortgage in isolation, is what actually decides whether switching is worth doing -- a distinction most renewal-shopping comparisons never make.
| Pricing the switch and the HELOC together | Amount |
|---|---|
| Mortgage payment, renewing at 5.45% | $2,256 |
| Mortgage payment, switching at 4.95% | $2,163 |
| Mortgage saving from switching | $93/mo |
| HELOC payment, kept at 4.45% | $167 |
| HELOC payment, repriced to 6.95% | $261 |
| HELOC cost increase from switching | +$94/mo |
| Total monthly cost | Renew (stay) | Switch |
|---|---|---|
| Mortgage payment | $2,256 | $2,163 |
| HELOC interest-only payment | $167 (4.45%) | $261 (6.95%) |
| Property tax and heat | $480 | $480 |
| Car loan | $300 | $300 |
| Total monthly cost | $3,203 | $3,204 |
The total is $1 higher switching than staying — essentially unchanged once both products are priced side by side, even though the mortgage comparison alone looked like a clear win. Total debt service works out to 34.8% either way.
The solution
A mortgage agent licensed under Ontario's Mortgage Brokerages, Lenders and Administrators Act refused to quote the mortgage rate in isolation.
First, priced the HELOC's actual cost under each scenario, not just its current balance. Confirmed directly with the bank that the 2018 promotional pricing is tied to keeping the mortgage there, and that current new-customer HELOC pricing runs materially higher.
Second, built one combined monthly-cost comparison, not two separate quotes. Showed the household the $93 mortgage saving against the $94 HELOC increase side by side, rather than let a mortgage-only rate quote stand as the whole picture -- the kind of comparison covered in HELOC vs. refinance.
Third, used the competing offer as leverage with the existing bank, not as a plan to actually switch. Since switching produced no real net benefit once the HELOC was included, the household went back to their own bank with the 4.95% quote in hand and asked for a matched renewal rate.
The outcome
The household renewed with their existing bank at a rate matched to the competing offer, keeping the HELOC's 2018 pricing untouched. Total debt service settled at 34.8% either way -- the ratio was never what this file turned on.
Because this is an uninsured renewal, CMHC's ratio maximums don't apply; the 34.8% figure is informational, showing that the ratio itself never distinguished between the two paths -- the dollar comparison did.
What to take from this file
- 01A mortgage-only rate quote can hide a real cost sitting in a companion product. A HELOC priced under an old promotion is exactly the kind of cost a rate-comparison spreadsheet never asks about.
- 02Ask what a HELOC's pricing is actually tied to before assuming it survives a switch. Some grandfathered rates are tied to the banking relationship, not to the HELOC's own registration.
- 03Price both products together, as one number, before recommending a move. A $93 saving and a $94 increase look very different added together than they do quoted separately.
- 04A competing offer is useful leverage even when the client never switches. Once the net benefit of switching evaporated, the same quote still won a matched renewal rate.
- 05Keeping the household's own bank isn't a failure to find them a better deal. The right recommendation is the one with the best net number, not the best headline rate.
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).
- ▸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:
- ▸5.45% / 4.95% / 4.45% / 6.95% rates — rates move daily; none of these are quotes.
- ▸the HELOC repricing to current market terms on a mortgage switch — each bank sets its own policy on whether and how a companion HELOC is affected when the mortgage attached to the same relationship moves to a different lender -- this is not a universal rule.
- ▸the negotiated matched renewal rate — a lender's willingness to match a competing quote is a case-by-case retention decision, not a guaranteed outcome.
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.