Second Mortgage vs Refinancing: Which Is Right for You?

Two Ways to Access Your Home Equity

If you need to access the equity in your home, you generally have two options: refinancing your first mortgage or taking out a second mortgage. Both let you tap into your home's value, but they work differently and the right choice depends on your specific numbers.

How Refinancing Works

Refinancing means replacing your existing mortgage with a new, larger one. The new mortgage pays off the old one, and you receive the difference as cash.

Example: Your home is worth $800,000. You owe $400,000 on your current mortgage at 3.9%. You refinance into a new $550,000 mortgage and receive $150,000 in cash. Your old mortgage is gone, replaced by the new one.

How a Second Mortgage Works

A second mortgage is a separate loan that sits behind your existing first mortgage. Your first mortgage stays exactly as it is. The second mortgage gives you additional funds secured by the remaining equity.

Example: Same $800,000 home with a $400,000 first mortgage at 3.9%. You take a $150,000 second mortgage. Now you have two mortgages: the original $400,000 and the new $150,000.

The Penalty Factor: Why This Matters

If your first mortgage is not up for renewal, breaking it early triggers a prepayment penalty. For fixed-rate mortgages at major Canadian banks, the penalty is the greater of three months' interest or the Interest Rate Differential (IRD).

The IRD can be substantial. Here is how it works:

For example, if you locked in a 5-year fixed at 5.5% in 2023 and want to break it in 2026 with 2 years remaining, rates have dropped significantly. The IRD on a $400,000 mortgage could easily be $8,000 to $15,000 or more.

Source: Canada.ca, Mortgage Fees: Prepayment Penalties; Canadian Mortgage Trends

Side-by-Side Cost Comparison

Let's run the real numbers for a homeowner with a $400,000 first mortgage at 3.9% (locked in 2021, 2 years remaining) who needs $150,000:

Option A: Refinance (Bank)

Option B: Second Mortgage (Private)

When Refinancing Makes More Sense

• Your current rate is high: If you locked in at 5%+ during 2022-2023, refinancing to today's rates (3.5-4.5%) could actually save you money
• Your mortgage is up for renewal: No prepayment penalty applies at renewal
• You want one simple payment: Managing two mortgages adds complexity
• You can qualify with a bank: Bank refinancing rates (3.5-5.5%) are significantly lower than private second mortgage rates

When a Second Mortgage Makes More Sense

• You have a low first mortgage rate: If you locked in at 2.5-3.9% during 2020-2021, breaking that mortgage destroys real value
• The penalty to break is high: An IRD penalty of $10,000+ makes refinancing expensive upfront
• You cannot qualify with a bank: Credit issues or income verification problems prevent bank refinancing
• You need funds quickly: Private second mortgages can fund in days vs. weeks for bank refinancing
• You need a smaller amount: If you only need $50,000-$150,000, a second mortgage avoids refinancing a much larger first mortgage

The Break-Even Analysis

The key question is: does the lower rate from refinancing offset the penalty cost?

If the break-even period exceeds your planned ownership timeline, the second mortgage is likely the better financial decision despite the higher rate.

Current Rate Context

With the Bank of Canada's policy rate at 2.25% (as of early 2026), here is where rates sit:

Source: Ratehub.ca (March 2026); Bank of Canada policy rate

The Bottom Line

Neither option is universally better. The right choice depends on your current mortgage rate, prepayment penalties, the amount you need, your credit situation, and how quickly you need funds. A mortgage broker can run the numbers for both options and show you which one costs less in your specific situation.