HELOC vs Mortgage Refinance in Canada 2025

Updated March 2025 · 10 min read

When you need to access equity in your home, two main options exist in Canada: a Home Equity Line of Credit (HELOC) or a mortgage refinance. Both let you borrow against your property, but they work very differently. Choosing the right one depends on your renovation timeline, the amount you need, your tolerance for variable rates, and your overall financial picture.

How a HELOC Works

A HELOC is a revolving line of credit secured against your home. Under OSFI B-20, you can borrow up to 65% of your home's appraised value via HELOC, with the combined total of your mortgage and HELOC capped at 80% of appraised value.

With a HELOC, you draw funds as needed — only paying interest on what you've actually borrowed. This makes it ideal for projects where costs come in stages, like a phased renovation where you pay contractors in installments over several months.

How a Mortgage Refinance Works

A mortgage refinance replaces your existing mortgage with a new, larger one — delivering the difference as a lump sum. For example, if you owe $300,000 on a home worth $700,000, you could refinance to $500,000 and receive $200,000 in cash (keeping the combined total below 80% of appraised value).

You then repay the new, larger mortgage over an amortization period (typically 25 years in Canada), making regular principal + interest payments. You can choose a fixed or variable rate.

Side-by-Side Comparison

When a HELOC Is the Better Choice

A HELOC makes more sense when:

• You are doing a renovation in phases and don't know the exact total cost upfront
• You want flexibility to borrow, repay, and re-borrow over time
• You believe interest rates will remain stable or decline (variable rate benefits you)
• You are early in your mortgage term and face steep prepayment penalties to refinance
• You want interest-only payments during the project phase to manage cash flow

Example: A $75,000 home addition project spread over 8 months. With a HELOC, you draw $15,000–$20,000 per phase, paying interest only on the drawn amount. Your average balance during construction is $45,000, costing roughly $240/month in interest at 6.45%. With a refinance, you'd take the full $75,000 upfront and pay principal + interest on all of it from day one.

When a Mortgage Refinance Is the Better Choice

A mortgage refinance makes more sense when:

• You know the exact amount needed and want to borrow it all at once
• You want rate certainty — a fixed-rate refinance eliminates variable rate risk
• You are consolidating significant high-interest debt and want a structured repayment plan
• You are already near your mortgage renewal date (avoiding penalties)
• Your existing mortgage has a competitive rate you want to preserve alongside the HELOC (via a readvanceable mortgage product)

Prepayment Penalties: The Hidden Cost of Refinancing

One of the most significant factors in the HELOC vs. refinance decision is prepayment penalties. If you refinance before your mortgage term ends, your lender will charge a penalty — either 3 months of interest or the Interest Rate Differential (IRD), whichever is higher.

IRD penalties on fixed-rate mortgages can be enormous. On a $400,000 fixed mortgage with two years remaining, IRD penalties could reach $100–$20,000 or more, depending on the rate gap. HELOCs have no such penalties.

Readvanceable Mortgages: The Best of Both Worlds

Many Canadian banks offer readvanceable mortgages — products that combine a mortgage and HELOC in one. As you pay down your mortgage principal, that room automatically becomes available in your HELOC, up to the 65% cap.

Popular products include:

• Scotiabank STEP (Scotia Total Equity Plan)
• TD FlexLine
• RBC Homeline Plan
• National Bank All-In-One

With a readvanceable mortgage, you get the structured repayment of a traditional mortgage plus the revolving flexibility of a HELOC — all in one product. This can be the most powerful setup for homeowners who plan to do ongoing renovations over several years.

Tax Implications

In both cases, interest on funds used for personal purposes (home renovations, personal spending) is not tax-deductible in Canada. However, if you use HELOC funds or refinance proceeds to invest in income-producing assets, the interest may be deductible.

This is known as the "investment loan interest deduction" and must be properly documented. Consult a CPA for your specific situation.

The Bottom Line

For most homeowners planning renovations in 2025, a HELOC offers the better combination of flexibility, lower setup costs, and the ability to borrow incrementally. However, if you need a large lump sum, want rate certainty, or are near your mortgage renewal, a refinance may be more appropriate.

Work with a mortgage broker or your bank's mortgage specialist to run the numbers for your specific situation — including any penalties, total interest costs, and cash flow implications.