Mortgage trigger rate: checks for Canadian borrowers

A mortgage trigger rate is the interest rate at which a Canadian fixed-payment variable mortgage payment covers interest but no longer reduces the amount borrowed. If rates rise further, unpaid interest may increase the balance, depending on the contract. Checking your lender’s thresholds helps explain why an unchanged payment can hide growing repayment pressure.

• A fixed payment does not mean your mortgage interest rate is fixed.
• The trigger rate and the contractual trigger point are different thresholds.
• An extended repayment projection is not automatically a longer mortgage agreement.
• Payment increases, lump sums and conversion options come with different costs and conditions.

Does your Canadian mortgage have a trigger rate?

Start with the mortgage agreement rather than the amount leaving your bank account. A fixed-rate mortgage holds its interest rate steady during the agreed term. A variable-rate mortgage can have either adjustable payments or payments that initially remain unchanged as interest rates move.

For an adjustable-payment mortgage, rising rates generally feed through to higher payments. With a fixed-payment variable mortgage, the change happens inside the payment: interest takes a larger share, leaving less to reduce principal, which is the outstanding amount borrowed.

The Bank of Canada explained this distinction in its November 2022 analytical note on trigger rates. That historical explanation describes how these contracts work; its estimates of affected borrowers are not a measure of conditions today.

This article concerns Canadian mortgages. UK readers cannot assume a lender uses the same contractual thresholds simply because their loan is described as variable. For the wider budgeting distinction between news and a contractual payment change, see our guide to using interest rate forecasts in a household budget.

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

The trigger rate describes the point at which interest absorbs the payment and principal repayment stops. It is specific to your mortgage circumstances, not a universal Bank of Canada policy-rate threshold. Your lender can confirm the relevant rate for your current balance and payment arrangement.

If the interest charged then exceeds what the payment covers, some contracts allow the shortfall to be added to the balance. This is negative amortization: instead of gradually owing less, the outstanding debt grows despite regular payments.

When the contract requires a change

A trigger point is a separate contractual limit that can require action after unpaid interest has accumulated. The Bank of Canada describes differences in lenders’ approaches, so one bank’s process is not a rule for every Canadian borrower.

TD’s mortgage guidance, checked in October 2026, explains that unpaid interest can increase the amount owing after the trigger rate is reached. At its trigger point, the borrower must adjust payments, make a prepayment or convert to a fixed-rate mortgage, subject to applicable conditions.

Term	What it tells you	What to confirm
Trigger rate	The payment stops reducing principal.	Your current threshold and interest calculation.
Negative amortization	Unpaid interest can increase the balance.	Whether your contract permits this and how it is recorded.
Trigger point	A contractual threshold requires a response.	The action, notice and deadline in your agreement.

Why can the statement show a much longer repayment period?

Amortization is the planned period for repaying the mortgage, while the mortgage term is the period covered by the current agreement. When less of each payment reaches principal, a statement may show a much longer projected payoff period. That projection can be alarming, but it needs interpreting alongside the contract.

In its September 13, 2023 backgrounder, the Office of the Superintendent of Financial Institutions, or OSFI, explained that rate changes do not themselves rewrite contractual amortization. A lender’s projection can assume the current payment and interest rate continue, without granting a new contractual repayment schedule.

Consequently, an unchanged payment is not proof that the original repayment plan remains on track. Ask the lender to distinguish the projection on the statement from the schedule you have actually agreed to. Also request the payment needed to return to that schedule.

What can you ask the lender before the threshold is reached?

A useful conversation starts with current documents: the agreement, recent statement and any rate-change notice. Request a written explanation of your position rather than relying on a general online calculator. An estimate cannot establish what your particular lender will require.

1. Confirm whether payments adjust with the rate or remain fixed.
2. Ask for the current trigger rate and whether any unpaid interest has accumulated.
3. Request the contractual trigger-point wording and any response deadline.
4. Ask how a higher payment or lump sum would affect principal repayment.
5. Obtain the charges and conditions for conversion or other changes.

Keep essential household spending and other debt commitments visible when comparing options. A larger payment might restore progress on the mortgage while leaving too little for ordinary bills. If the proposed payment is unaffordable, explain that before accepting a revised arrangement and ask which alternatives the lender can assess.

How do payment increases, lump sums and conversion compare?

Increasing regular payments can direct more money towards the debt, but the ongoing commitment has to fit the budget. A lump sum reduces the balance without necessarily creating the same recurring expense. However, using available cash has consequences for your ability to meet other costs.

Prepayment privileges determine what can be paid without a charge. Converting to a fixed rate can provide rate certainty for the new arrangement, but it does not erase interest already added to the balance. Request the actual conversion rate, payment, term and restrictions before comparing it with staying variable.

OSFI notes that restoring contractual amortization can mean higher payments. A negotiated extension is not automatic and can involve refinancing and lender assessment. Our separate guide to checking a Canadian mortgage renewal offer covers the broader comparison when your current term is ending.

Informational content only, not financial advice.