Rates & Terms
Variable Rate Payment Types: Adjustable vs Static
Adjustable vs static variable rate mortgage: how each payment structure reacts when prime rate moves, plus trigger rates, stress test rules, and break penalties.
When you compare an adjustable vs static variable rate mortgage, the difference comes down to what changes after you sign. With an adjustable-rate variable mortgage, your payment rises or falls whenever your lender's prime rate changes. With a static (fixed-payment) variable mortgage, your payment stays the same and the split between interest and principal shifts instead. Both track prime, and prime generally moves in step with the Bank of Canada policy rate.
That single design choice affects your monthly cash flow, how fast you pay down principal, and what happens when rates climb. It matters more than the headline discount you see advertised.
The Two Variable Structures, Side by Side
Variable describes how your interest rate is calculated, not how your payment behaves. A variable rate mortgage is priced off your lender's prime rate. Lenders set prime themselves, but in practice they generally move it alongside the Bank of Canada's overnight target. That link is why policy rate announcements show up in your budget.
Adjustable-rate variable mortgage
Your payment is recalculated whenever prime moves. If prime falls, your payment drops and you keep the same amortization schedule. If prime rises, your payment rises, often at the next scheduled payment date and sometimes after a short notice period. Your amortization stays on track because each payment still covers the interest owing plus some principal.
Static-payment variable mortgage
Your payment is set at the start and holds through the term, even as prime moves. What changes is the makeup of each payment: when prime rises, more of your payment covers interest and less goes to principal. Your amortization can stretch beyond the original schedule, or shorten if prime falls. This structure is common in Canada, so confirm which one you are actually being offered before you sign.
When Prime Rate Moves, What Actually Changes
The Bank of Canada sets its policy rate on fixed announcement dates through the year. Lenders then decide whether to move their own prime rate. Prime is not legislated to follow the policy rate, and a lender can move it independently, but historically the two move together. For the full chain from policy rate to your contract, see how mortgage rates work in Canada.
| What you are comparing | Adjustable-rate variable | Static-payment variable |
|---|---|---|
| What changes when prime moves | Your payment amount | The interest and principal split |
| Amortization | Stays on schedule | Can stretch or shorten |
| Payment predictability | Lower, your budget must flex | Higher, the payment is fixed |
| Trigger point risk | Low, since the payment adjusts | Possible if the payment no longer covers interest |
| Typical penalty to break | Usually three months of interest, confirm with your lender | Usually three months of interest, confirm with your lender |
Trigger Rates and the Static-Payment Trade-Off
With a static-payment variable mortgage, your payment has a limit. A trigger point is reached when your fixed payment no longer covers the interest owing at the current rate. At that point the lender typically contacts you and may ask you to increase your payment, make a lump-sum prepayment, or convert the mortgage to a fixed rate. Some lenders set the trigger where the payment equals interest only, while others build in a buffer and adjust automatically.
If a contract allows the shortfall to be added to your balance, your loan can grow, a situation sometimes called negative amortization. That is not standard, and rules vary by lender and by province. Ask your lender directly what your trigger rate is and what happens when you reach it. A static-payment structure without a clear trigger policy is a cash-flow risk worth understanding before you commit.
Which Payment Structure Fits Your Budget
- Choose an adjustable-rate variable mortgage if your budget can absorb a higher payment when prime rises, and you want faster principal reduction when prime falls.
- Choose a static-payment variable mortgage if you need predictable month-to-month cash flow and would rather manage rate risk at renewal.
- Either way, check whether your contract lets you raise your regular payment or prepay without penalty. That flexibility is how you blunt a trigger point before it hits.
- If predictability matters most to you, run the numbers against a fixed rate with the fixed vs variable mortgage calculator.
Qualifying: The Stress Test, GDS/TDS, and OSFI B-20
Payment structure does not change how you qualify. Federally regulated lenders apply OSFI Guideline B-20, and you must pass the federal mortgage stress test: you are assessed at the higher of your contract rate plus two percentage points, or a published qualifying-rate floor. Confirm the current floor with OSFI or your lender before you build a budget. For the mechanics, see the Canadian mortgage stress test.
Lenders also measure GDS and TDS ratios. Gross debt service compares housing costs to income, and total debt service adds your other debts. If your down payment is under 20%, your mortgage must be insured, typically through CMHC mortgage default insurance, which adds a premium to your balance. Down payment sources such as the First Home Savings Account (FHSA) or the RRSP Home Buyers' Plan do not change the qualification math, but they do change how much you need to borrow and how much interest you pay over time.
Penalties, Conversions, and Renewal
Variable rate mortgages are generally easier and cheaper to break than fixed rate mortgages. Lenders usually charge three months of interest on a variable mortgage, while fixed rate mortgages often use the interest rate differential (IRD), which can be considerably larger when rates have fallen since you signed. Confirm your lender's exact formula in writing, and read IRD explained for how the fixed-rate version is calculated.
Many lenders let you convert a variable mortgage to a fixed rate mid-term, but the lender sets the rate and may charge a fee. At renewal you can change structures or switch lenders entirely; moving to a new lender usually means requalifying under the stress test again. Weigh that before you lock in.
What to Ask Before You Choose
- Is this an adjustable-rate or a static-payment variable mortgage?
- What is my trigger rate, if any, and what happens when I reach it?
- Can I raise my regular payment or prepay without penalty?
- What is the exact penalty to break this mortgage, and how is it calculated?
- How often can my payment change, and with how much notice?
Get the answers in your commitment letter, not just in conversation. The payment structure you accept is the part of a variable rate mortgage you actually live with every month.
Frequently asked questions
What is the difference between an adjustable and a static variable rate mortgage?
Both track your lender's prime rate, but they respond differently. An adjustable-rate variable mortgage changes your payment when prime moves, so your amortization stays on schedule. A static-payment variable mortgage keeps your payment the same and shifts the interest-to-principal split instead, which can stretch your amortization. Ask your lender which structure your contract uses before you sign.
Is a static-payment variable mortgage the same as a fixed rate mortgage?
No. Your payment is fixed, but your interest rate still moves with prime, so the amount going to interest versus principal changes. A fixed rate mortgage locks both the rate and the payment for the term. Static-payment variable mortgages carry rate risk through the term and typically use a three-month interest penalty to break, while fixed mortgages often use the interest rate differential.
What happens if my variable mortgage hits its trigger rate?
The trigger point is where your fixed payment no longer covers the interest owing at the current rate. Your lender typically contacts you and may ask you to increase your payment, make a lump-sum prepayment, or convert to a fixed rate. Policies vary by lender and province, so ask for your specific trigger rate and the lender's options in writing.
Are variable rate mortgage penalties lower than fixed rate penalties?
Usually, yes. Variable rate mortgages are commonly charged three months of interest to break, while fixed rate mortgages often use the interest rate differential, which can be considerably larger when rates have fallen since you signed. Confirm your lender's exact formula, because some contracts and lenders calculate penalties differently, and the gap can be significant.