Trigger Rate Explained: When Your Variable Mortgage Payment Isn't Enough

A trigger rate is the interest rate at which a fixed-payment variable mortgage stops covering the interest charged for that period — the point where none of your monthly payment goes toward reducing what you actually owe. It only applies to variable-rate mortgages where your payment amount stays the same for the whole term, which is the most common variable mortgage structure at Canadian banks.

Most variable-rate homeowners never think about their trigger rate until a lender letter arrives — and by then, the options can feel rushed. This guide walks through what a trigger rate actually is, how it's calculated, how it differs from a trigger point, what happens when you reach it, and what Ontario homeowners can do to stay ahead of it.

Quick answer: A trigger rate is the point where your fixed variable-mortgage payment no longer covers the interest owed for that period, so none of it reduces your principal balance. It applies only to fixed-payment variable mortgages, not to variable mortgages where the payment itself moves with the rate. Your exact trigger rate is set out in your mortgage contract or renewal disclosure. If you're approaching it, most lenders offer options such as increasing your payment, making a lump-sum payment, or switching to a fixed rate — a licensed Ontario mortgage broker can help you compare them.

This guide covers how a trigger rate is calculated, the difference between a trigger rate and a trigger point, what happens once you reach it, what it means for Ontario homeowners, five mistakes to avoid, and the questions homeowners ask most.

Key Takeaways

• A trigger rate only applies to fixed-payment variable mortgages — not to adjustable-payment variable mortgages, where the payment amount itself moves up or down with the rate.
• For example, on an illustrative $500,000 mortgage, it can take a meaningful rise in the interest rate before a trigger rate is reached — the exact point depends entirely on your own contract, not a number that applies to everyone.
• Once a payment stops covering interest, the shortfall is typically added to your outstanding balance, a situation the Financial Consumer Agency of Canada (FCAC) calls negative amortization.
• Federally regulated lenders are required to disclose your trigger rate in your mortgage agreement or renewal documents, so it's worth locating that number rather than guessing at it.
• Ontario homeowners renewing a variable-rate mortgage can ask their lender or an FSRA-licensed mortgage broker to check how close their current payment sits to their trigger rate before renewal day arrives.
• Reviewing your mortgage before a lender letter arrives — not after — gives you more time to compare a payment increase, a lump-sum payment, or a fixed-rate switch without rushing the decision.

What Is a Trigger Rate on a Variable Mortgage?

A trigger rate is the specific interest rate at which a fixed-payment variable mortgage stops covering the interest charged for that period, meaning none of the payment reduces the principal balance.

Definition moment: Fixed-payment variable mortgage (also called a static-payment variable mortgage) — the technical term for a variable-rate mortgage where your monthly payment amount stays the same for the length of your term, even though the interest rate itself can move up or down. This is different from an adjustable-payment variable mortgage, where the payment amount rises or falls along with the rate — a mortgage structure that has no trigger rate at all, since the payment always keeps pace with the interest owed.

According to the Financial Consumer Agency of Canada (FCAC), the trigger rate is disclosed in your mortgage agreement and represents the interest rate at which your payment covers interest only, with nothing left over to pay down principal. Many homeowners assume every variable mortgage works the same way — but whether you even have a trigger rate depends entirely on which of the two structures above your lender set you up with.

This distinction matters for Ontario homeowners in particular, since a large share of mortgages renewing across the GTA over the next couple of years were originated as fixed-payment variable products. Knowing which structure you have is the first step to understanding whether a trigger rate applies to you at all.

Bottom line: A trigger rate only exists on fixed-payment variable mortgages, and it marks the point where your payment stops covering interest. If you're not sure which structure your mortgage uses, your loan documents or your lender can confirm it — and an FSRA-licensed Ontario broker can help you read the fine print.

How a Trigger Rate Is Calculated (With an Illustrative Example)

A trigger rate is calculated from your original mortgage amount, your amortization period, and the fixed payment set when your term began — it's the rate at which the interest portion of that payment equals or exceeds the full payment amount.

In plain terms: your payment was set based on the rate available when you signed. As the variable rate moves higher, more of each payment goes toward interest and less toward principal. Once the interest owed for the period reaches the full payment amount, you've hit your trigger rate — every additional dollar of interest above that gets added to your balance instead of paid off.

The example below is illustrative only — it is not a rate lendsimpl is quoting, and it does not reflect current market pricing, which changes constantly.

Example (illustrative only): Say a homeowner has a fixed-payment variable mortgage on a $500,000 balance, with a monthly payment of roughly $2,900 based on the rate available when they signed. If the variable rate then rises enough that the interest portion alone would cost more than $2,900 a month, that homeowner has reached their trigger rate. The exact number depends entirely on the mortgage amount, amortization, and original contract terms — always confirm your own trigger rate with your lender or broker rather than assuming it from an example like this one.

A common point of confusion is mixing up the trigger rate with the mortgage stress test rate used at qualification — the two are unrelated. The stress test is a qualifying hurdle applied when you first get approved; the trigger rate is a payment mechanic that only becomes relevant after your mortgage is already in place.

Trigger Rate vs. Trigger Point: What's the Difference?

The difference between a trigger rate and a trigger point is what each one measures: a trigger rate is an interest-rate threshold, while a trigger point is a balance threshold — and a fixed-payment variable mortgage can involve both.

Definition moment: Trigger point — the technical term for the outstanding balance level, often expressed as a set percentage of the original principal or the property's value, that a lender will not let a mortgage exceed. Unlike a trigger rate, which is about the interest rate reaching a certain level, a trigger point is about the balance itself growing too large through negative amortization, regardless of the current rate.

In practice, the two work together. Once a mortgage passes its trigger rate, unpaid interest can start accumulating onto the balance. If that balance keeps growing, it can eventually reach the mortgage's trigger point — the level at which the lender requires action, such as a payment increase or a lump-sum paydown, regardless of what the rate does next.

Not every lender structures trigger points the same way, and some fixed-payment variable mortgages are designed so payments adjust automatically before a trigger point is ever reached. Your specific contract — not a general rule — determines how your mortgage behaves.

Bottom line: A trigger rate is about the interest rate; a trigger point is about your balance. Understanding both helps you ask your lender or broker the right question: not just "what's my rate?" but "how close is my balance to my trigger point?"

What Happens When You Hit Your Trigger Rate

Reaching a trigger rate doesn't mean your mortgage is in default — it means your lender will typically reach out with a defined set of options, and acting early gives you more control over which one you choose.

1. Your lender contacts you. Federally regulated lenders are required to notify you when your payment is no longer covering the full interest owed, generally before or as soon as the trigger rate is reached.
2. You may be asked to increase your payment. Raising your monthly payment to cover the current interest amount is the most common first option lenders offer.
3. You can make a lump-sum prepayment. Paying down part of the principal can bring your balance back in line with your existing payment, depending on your mortgage's prepayment privileges.
4. You can switch to a fixed rate. Many lenders allow a mid-term switch to a fixed-rate product, which locks in a payment that fully covers both principal and interest going forward.
5. Your amortization may be extended, within limits. Some lenders can extend your amortization period to lower the payment needed to cover interest — though this is subject to lender policy and, for insured mortgages, regulatory limits.
6. If no action is taken, negative amortization can continue. Unpaid interest keeps adding to your balance until a trigger point or another lender-defined limit is reached, at which point a payment change becomes required rather than optional.

Which option makes sense depends on your income, your equity, your credit profile, and how much time is left in your term — there's no single right answer, and approval for any switch still depends on lender criteria and documentation.

What This Means for Ontario Homeowners

Ontario carries one of the largest concentrations of variable-rate mortgages in the country, which means trigger rate questions come up constantly across the GTA — from Scarborough to Ottawa.

Homeowners in Scarborough, Richmond Hill, North York, Pickering, Ajax, and Ottawa have all reached out to lendsimpl in similar situations: a lender letter arrives, and the homeowner isn't sure whether it's routine or urgent. In most cases it's routine — but understanding your options ahead of time turns a stressful letter into a straightforward decision.

Because trigger rates depend on your original contract, amortization, and lender, an Ontario-specific comparison matters. A broker licensed in Ontario can pull quotes from lenders active in your specific city and property type, rather than a generic national average.

Bottom line: Wherever you are in the GTA, the fastest way to know your real trigger rate situation is to ask — not guess. lendsimpl is a licensed Ontario mortgage brokerage (FSRA #13763) that works with homeowners across the province, not only near our Scarborough office.

5 Mistakes to Avoid With a Fixed-Payment Variable Mortgage

These five mistakes are the ones that turn a manageable trigger rate situation into a stressful one — all are avoidable with a bit of planning.

1. Assuming your variable mortgage doesn't have a trigger rate. Not confirming whether you have a fixed-payment or adjustable-payment structure means you may not see a payment issue coming.
2. Waiting for a lender letter instead of checking proactively. You can ask your lender or broker where your payment sits relative to your trigger rate at any time — you don't need to wait to be told.
3. Confusing the trigger rate with the trigger point. They measure different things, and mixing them up can lead to the wrong question when you call your lender.
4. Making decisions based on rate headlines instead of your own contract. General rate news doesn't tell you your specific trigger rate — only your mortgage documents and lender do.
5. Choosing a fix without comparing lenders first. Your current lender's fixed-rate offer may not be the most competitive one available — a broker comparison takes the guesswork out of it.

Useful Resources for Variable-Rate Mortgage Holders

Compare the full picture in our fixed vs. variable mortgage rates guide if you're weighing whether to stay variable or switch.

See how the mortgage stress test works in Canada — a separate qualifying rule that's often confused with the trigger rate.

Renewing soon? Read our guide to Canada's 2026 mortgage renewal wave for what to expect before your term ends.

Model your numbers with our free renewal switch savings calculator before deciding whether to switch lenders.

Visit our mortgage renewal Ontario page for a broader look at how lendsimpl supports homeowners through renewal.

Ready to talk it through? Connect with a licensed Ontario mortgage broker in Toronto for a free, no-pressure review of your options.

Frequently Asked Questions — Trigger Rate on a Variable Mortgage

What is a trigger rate on a variable-rate mortgage?

A trigger rate is the interest rate at which your fixed-payment variable mortgage stops covering the full interest owed for that period, meaning none of your payment reduces the principal balance. It only applies to fixed-payment (static-payment) variable mortgages, not to ones where the payment itself moves with the rate. Your exact trigger rate is set out in your mortgage contract or renewal disclosure, and your lender or an FSRA-licensed mortgage broker can help you locate and understand it.

What is the difference between a trigger rate and a trigger point?

A trigger rate measures the interest rate itself — the level at which your payment stops covering interest. A trigger point measures your outstanding balance — typically a set percentage of the original principal or property value that the lender won't let the mortgage exceed. A mortgage can pass its trigger rate without immediately reaching its trigger point, since the balance grows gradually through unpaid interest.

What happens if I hit my trigger rate?

Your lender will typically contact you with options, which commonly include increasing your monthly payment, making a lump-sum prepayment, switching to a fixed rate, or in some cases extending your amortization within lender and regulatory limits. Reaching your trigger rate does not mean your mortgage is in default — it means action is likely needed. A mortgage broker can help you compare which option fits your situation.

Can my mortgage balance grow past what I originally borrowed?

Yes, in a situation called negative amortization, which the Financial Consumer Agency of Canada (FCAC) describes as unpaid interest being added to your outstanding balance once your payment no longer covers interest in full. This is why lenders set trigger points — balance ceilings designed to require a payment adjustment before the situation continues indefinitely.

Do all variable-rate mortgages have a trigger rate?

No. Only fixed-payment (static-payment) variable mortgages have a trigger rate, since their monthly payment stays the same regardless of rate movement. Adjustable-payment variable mortgages, where the payment itself rises or falls with the rate, don't have a trigger rate because the payment is always recalculated to cover the interest owed.

Should I switch to a fixed rate before I reach my trigger rate?

It depends on your income, equity, remaining term, and comfort with rate movement — there's no single right answer, and approval for any switch still depends on lender criteria and documentation. A licensed Ontario mortgage broker can compare fixed-rate options across 30+ lenders against your current mortgage, so you can decide with real numbers instead of guessing. lendsimpl is FSRA-licensed brokerage #13763.

Disclaimer

This article is for general educational purposes only and should not be taken as financial, legal, or mortgage advice. Mortgage options, rates, approvals, and lender requirements can vary based on borrower profile, property details, credit history, income, equity, documentation, and current market conditions. Speak with a licensed mortgage professional before making a mortgage decision. lendsimpl is a licensed mortgage brokerage in Ontario (FSRA #13763).