Trigger Rate on Canadian Variable-Rate Mortgages
What trigger rates and trigger points mean on Canadian fixed-payment variable mortgages — lender rules, negative amortization, and renewal impacts.
Reviewed by Scott Dillingham · Licensed Mortgage Agent (Ontario, Level 2) · Updated September 9, 2026
Don't Auto-Renew Blind
Updated September 2026. With the Bank of Canada overnight rate at 2.25% and prime at 4.45%, trigger-rate pressure has eased dramatically — but borrowers who hit triggers during the 2022–2024 cycle are still navigating extended amortizations at renewal.
Key Takeaways
- • The trigger rate is the rate at which your fixed VRM payment stops reducing principal — 100% of the payment goes to interest.
- • The trigger point is later: when your balance exceeds the contractual cap (often 100–125% of the original principal).
- • Only fixed-payment variable mortgages have trigger rates. Adjustable-rate mortgages (ARMs) — like Scotiabank's standard variable — have no trigger because payments move with prime.
- • Most Big 6 fixed-payment VRMs are offered by TD, RBC, BMO, CIBC, and National Bank.
- • With prime at 4.45% (down from 7.20% in late 2023), triggers are largely behind us — but renewal reality checks are active.
- • Source: Bank of Canada Staff Analytical Note 2022-19.
Understanding the Two Types of Variable Mortgages in Canada
Before we can explain the trigger rate, you need to understand that not all "variable-rate mortgages" behave the same way in Canada. There are two distinct structures, and only one of them has a trigger rate at all.
Fixed-Payment VRM
Your monthly payment stays constant regardless of prime. When prime rises, more of each payment goes to interest and less to principal. This is where the trigger rate lives.
Offered by: TD, RBC, BMO, CIBC, National Bank
Adjustable-Rate Mortgage (ARM)
Your payment changes every time the Bank of Canada moves prime. Each payment always covers the full interest charge plus some principal. No trigger rate exists.
Offered by: Scotiabank (standard variable), many monolines
How the Trigger Rate Mechanism Works
When you sign a fixed-payment variable mortgage, your payment is calculated based on the contract rate at origination. If prime subsequently rises, the interest portion of each payment grows. Eventually, a rate is reached where the interest charge exactly equals your payment — meaning nothing is left over to reduce the principal balance. This is your trigger rate.
Past the trigger rate, the lender has two operational choices. Most Canadian lenders allow negative amortization — the unpaid interest is added to the principal balance, so your loan grows each month. Your payment stays the same on paper, but your amortization period quietly extends. Some borrowers who signed VRMs with 25-year amortizations in 2020–2021 watched those schedules stretch to 35, 40, or even 50+ years on internal lender statements during the 2022–2024 tightening cycle.
Trigger Point: The Contractual Ceiling
Lenders don't let negative amortization run forever. Each mortgage contract specifies a trigger point — typically when the outstanding balance reaches 100%, 105%, or up to 125% of the original principal (standard-charge mortgages are usually at the lower end; collateral-charge mortgages at the higher end). When the balance hits this ceiling, the lender is contractually required to contact you and present options:
- Make a lump-sum prepayment to bring the balance back below the cap
- Increase your monthly payment to at least cover the interest charge
- Convert to a fixed-rate mortgage at the lender's current conversion rate
- Extend the amortization (subject to regulatory limits and lender policy)
Trigger Rate by Lender (May 2026)
Here's how Canada's major residential mortgage lenders structure their variable products. Always confirm with your specific contract, as terms can vary by product tier:
| Lender | Variable Structure | Trigger Rate Applies? | Typical Trigger Point Cap |
|---|---|---|---|
| TD Canada Trust | Fixed-payment VRM | Yes | 105% of original principal |
| RBC Royal Bank | Fixed-payment VRM | Yes | ~105–110% |
| BMO | Fixed-payment VRM | Yes | ~105% |
| CIBC | Fixed-payment VRM | Yes | ~105% |
| National Bank | Fixed-payment VRM | Yes | ~105% |
| Scotiabank | ARM (adjustable-rate) | No — payment floats with prime | N/A |
| Most monolines | Mixed — often ARM | Varies | Varies |
Source: Lender product disclosures as of May 2026. Confirm specific cap language in your mortgage commitment letter and annual statement.
Why Trigger Rates Were a Crisis in 2022–2024
The Bank of Canada's overnight rate rose from 0.25% in March 2022 to 5.00% by July 2023 — the fastest tightening cycle in a generation. Prime rate climbed from 2.45% to 7.20% in roughly 16 months. Fixed-payment VRM borrowers who had signed contracts at discounted rates of prime minus 1% saw their effective interest rate triple, and many hit their trigger rates within the first year of the cycle.
The Bank of Canada's own Staff Analytical Note 2022-19 estimated that roughly half of all fixed-payment VRM holders had hit their trigger rate by late 2022. Federally regulated lenders worked with OSFI to permit amortization extensions as a relief mechanism, rather than force mass payment shock mid-term. The Canadian Mortgage Charter later formalised some of these protections.
Where We Are Today (September 2026)
The Bank of Canada's overnight rate is now 2.25%, held for the 6th consecutive meeting on July 15, 2026. Prime rate sits at 4.45% — far below the 7.20% peak. Next announcement: September 2, 2026 (2026-09-02). For most fixed-payment VRM holders, payments are comfortably above the trigger rate again, and the principal portion of each payment is growing again. The acute trigger-rate crisis is over.
However, borrowers who hit their trigger point during the cycle may still be carrying extended amortizations — 35, 40, even 45+ years on paper. At renewal, the lender must contractually restore a normal amortization schedule, and that reset can cause meaningful payment increases even in today's lower-rate environment. This is why starting the renewal process 120 days early and shopping for the best rate matters more than ever. See our mortgage rate forecast for what to expect through the rest of 2026.
How to Calculate Your Current Trigger Rate
A simplified formula: your trigger rate is approximately your payment amount, divided by your outstanding balance, multiplied by 12 (for monthly payments) and expressed as a percentage. A more precise calculation requires your exact payment schedule and Canadian semi-annual compounding, but the rough rule is close enough for planning purposes.
Example
Outstanding balance: $500,000. Monthly payment: $2,500. Estimated trigger rate ≈ ($2,500 × 12) ÷ $500,000 = 6.00%. At today's effective VRM rates around 4.55% (prime 4.45% + 0.10%), this borrower has roughly 1.45 percentage points of cushion before hitting their trigger.
Frequently Asked Questions
What is a trigger rate on a Canadian variable-rate mortgage?
The trigger rate is the interest rate at which your fixed monthly payment on a variable-rate mortgage (VRM) no longer covers any principal — 100% of your payment is going to interest. Once reached, further rate increases cause your loan balance to grow instead of shrink (negative amortization). It only applies to fixed-payment VRMs, not adjustable-rate mortgages (ARMs) where the payment floats with prime.
What is the difference between a trigger rate and a trigger point?
The trigger rate is the prime-linked interest rate at which payments stop reducing principal. The trigger point occurs later — when your outstanding balance exceeds a contractual cap (often 100–125% of the original principal depending on the lender and whether the charge is standard or collateral). At the trigger point, the lender requires action: a lump-sum payment, a payment increase, or conversion to a fixed rate.
Which Canadian lenders have fixed-payment VRMs that can hit a trigger rate?
Most Big 6 banks offer fixed-payment variable mortgages where the trigger-rate concept applies: TD, RBC, BMO, CIBC, and National Bank. Scotiabank's standard variable is structured as an adjustable-rate mortgage (ARM) where the payment changes with every Bank of Canada move — so there is no trigger rate. Monoline lenders are mixed; many brokers recommend ARMs specifically to eliminate trigger risk.
Are trigger rates still a concern in September 2026?
Largely no. With the Bank of Canada overnight rate at 2.25% and prime at 4.45% — down from a peak prime of 7.20% in late 2023 — most trigger-rate events that occurred between 2022 and 2024 have resolved. However, borrowers who hit trigger points during the cycle may still be carrying extended amortizations (35–40+ years on paper) that contractually reset at renewal, potentially causing payment shock.
What happens to my amortization at renewal if I hit a trigger point during my term?
At renewal, your lender is required to return your mortgage to a contractual amortization — typically the lesser of the original amortization or what remains on a normal schedule. Borrowers who saw their amortization stretch to 35 or 40 years on paper during the 2022–2024 rate cycle may face a sharp payment increase at renewal as the schedule is reset. Working with a broker 120 days before maturity lets you shop for the lowest rate to offset that adjustment.
Should I switch from a fixed-payment VRM to an ARM to avoid trigger rates?
An ARM (adjustable-rate mortgage, like Scotiabank's variable product) eliminates trigger risk because your payment adjusts each time prime changes. The trade-off is payment volatility — your monthly cost fluctuates with every BoC decision. With the BoC now in a neutral stance at 2.25%, payment volatility is relatively low. Speak to a broker about whether an ARM fits your cash-flow tolerance.
Related Guides
Fixed vs. Variable at Renewal
Choosing between fixed and variable in today's rate environment.
Bank of Canada Rate Decisions
Every BoC rate decision and what it means for your mortgage.
Canadian Rate Forecast
Where rates are heading — major bank forecasts for 2026 and beyond.
Payment Shock at Renewal 2026
Why renewal payments rise in 2026 — and how to estimate and reduce the increase.
Payment Frequency Calculator
Accelerated bi-weekly vs. monthly — see total interest saved.
Lower Your Payments at Renewal
Legitimate levers to reduce monthly payment pressure at renewal.
Don't Auto-Renew Blind
Book a free call with a licensed broker. We'll compare offers from 30+ lenders before your maturity date.