Refinancing vs. a Second Mortgage in Ontario: How to Compare

Refinancing replaces your existing first mortgage with a new, larger one and pays out the old balance. It can be the cheaper route when your current rate is close to today’s rates and the prepayment penalty is modest. It is often the more expensive route when you hold a below-market rate you would have to give up, or when the penalty is large.

The comparison that actually matters

Most homeowners compare interest rates. The more useful comparison is the total dollar cost over the period you expect to hold the financing, on each route, including every fee.

Refinancing vs. a second mortgage

Neither option is universally better. The right answer depends on the numbers in front of you.

A worked illustration

Illustrative only. Figures are for demonstration and are not quotes.

Suppose a homeowner needs $80,000. Their existing first mortgage is $420,000 at a rate meaningfully below current market, with three years remaining and a substantial prepayment penalty. Refinancing means the new, higher rate applies to the full $500,000 — not just the $80,000 they need — plus the penalty. A second mortgage applies a higher rate to $80,000 only, and leaves the $420,000 alone.

In that scenario the second mortgage may well cost less overall, despite the higher headline rate. Reverse the assumption — a first mortgage already at or above market, with a small penalty — and refinancing usually wins. The arithmetic, not the product, decides.

What refinancing costs

• Prepayment penalty on the existing mortgage
• Legal fees
• Appraisal
• Discharge and registration costs
• Possible title insurance
• Broker or lender fees, where applicable

What to ask before you decide

• What is my exact prepayment penalty, quoted in writing by my current lender?
• What is the total dollar cost of each option over the period I expect to hold it?
• What will my monthly payment be under each option?
• What happens at my next renewal under each option?
• If I wait until renewal instead, what would that cost me in the meantime?

Waiting until renewal

If your renewal is close, waiting can be the cheapest option of all, because the penalty disappears at maturity. Whether waiting is realistic depends on how urgent the need is and what the interim costs are. It deserves to be on the comparison table rather than assumed away.

Risks you should understand

• Refinancing extends your amortisation in most cases, which can increase total interest paid over time.
• Consolidating unsecured debt into a mortgage converts unsecured debt into debt secured against your home.
• Qualification is not guaranteed; final approval depends on the complete application and lender review.
• Rates and penalties change; figures should be confirmed at the time you act.

Written and reviewed by Rajiv Verma, Mortgage Broker, Licence #M13000402, Mortgage Architects (FSRA Brokerage Licence #12728). Rajiv works with Ontario homeowners on second mortgages, private financing, refinancing and debt consolidation.
Last reviewed: 21 July 2026.

This page is general education about mortgage options in Ontario. It is not legal, accounting, tax or insolvency advice, and it is not an offer of credit. Please seek independent professional advice for your own situation.

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