Mortgage Refinancing Canada Guide

When refinancing your Canadian mortgage makes financial sense — and how to calculate whether the numbers work.

What Is Mortgage Refinancing?

Refinancing means breaking your existing mortgage before the term end date and replacing it with a new mortgage — at a new rate, for a new term, and potentially for a larger amount. Unlike renewal (which happens at term end with no penalty), refinancing mid-term incurs a prepayment penalty that can range from a few thousand dollars to tens of thousands, depending on the mortgage type and lender.

Canadians refinance for several reasons: to access equity, to consolidate debt, to secure a lower rate, to change from variable to fixed (or vice versa), or to restructure their finances around a life change such as divorce or disability.

The Refinancing Rule: Maximum 80% LTV

When refinancing a Canadian mortgage, the maximum you can borrow is 80% of the appraised value of your property. This is a hard regulatory limit for federally regulated lenders. If your home is worth $800,000, you can refinance up to $640,000. If your current mortgage balance is $500,000, you can access up to $140,000 in equity through refinancing.

Break Penalties: The Critical Calculation

The break penalty is the most important number in any refinancing decision. It is what you pay to exit your current mortgage before the term ends.

Mortgage Type	Penalty Formula	Typical Amount
Variable rate	3 months interest	$5,000–$100
Fixed (monoline lender)	Greater of 3 months interest or IRD (bond-based)	$3,000–$15,000
Fixed (Big Six bank)	Greater of 3 months interest or IRD (posted-rate-based)	$100–$40,000+

The IRD (Interest Rate Differential) for big bank fixed mortgages can be devastatingly expensive because banks use their own posted rates in the calculation. A bank posted rate of 5.74% versus a discounted contract rate of 4.74% creates a large differential — and the further from term end you break, the more months of that differential you owe. Always calculate the specific penalty before deciding to refinance.

When Refinancing Makes Sense

• Debt consolidation: Replacing high-interest debt (credit cards at 20%+, personal loans at 10–15%) with mortgage debt at 5% can save thousands monthly — even after accounting for break penalties
• Home renovations: Adding equity to fund improvements that will increase the home's value
• Rate drop is significant enough to offset penalty: If current rates are 1%+ below your contract rate and you have more than 2 years left on term, refinancing may save money
• Life change: Divorce, disability, job loss — restructuring mortgage terms to reduce payments
• Investment opportunity: Accessing equity to invest (the Smith Manoeuvre, rental property down payment)

The Breakeven Calculation

Before refinancing, calculate your breakeven point. This is how long it takes for the monthly savings to repay the penalty cost:

• Penalty: $15,000
• Monthly savings from new lower rate: $300
• Breakeven: $15,000 / $300 = 50 months (4.2 years)

If you plan to stay in the home and keep the mortgage for at least 50 months, refinancing saves money in this example. If you might sell or renew in less time, the penalty exceeds the savings.

Blended Refinancing: A Middle Option

Some lenders offer "blend and extend" refinancing — blending your current contract rate with the current market rate to create a new blended rate for a new term, with no penalty. This is typically available 6–12 months before your term end. The resulting rate is higher than what you could get by waiting for renewal and shopping the market, but lower than your current rate — and there's no penalty to pay.

Blend and extend is most useful when you need to access equity urgently but don't want to pay a large break penalty.

Costs Beyond the Penalty

Refinancing also involves other costs to factor in:

• Legal/notary fees: $1,000–$2,000
• Property appraisal: $300–$500
• Discharge fee from old lender: $0–$400
• Registration fee for new mortgage: Varies by province

Total transaction costs typically run $1,500–$3,000 beyond the break penalty. These costs must be included in your breakeven calculation.