Keep your low first-mortgage rate with a second mortgage, or refinance everything? A side-by-side Ontario example with penalties, fees and break-even.
Quick answer: A second mortgage lets you keep a low first-mortgage rate and avoid a large penalty, at the cost of a much higher rate and fees on the second loan. It tends to win when the need is short — usually until your first mortgage renews — while a full refinance wins when renewal is years away or the penalty is small.
Many homeowners locked in low fixed rates and don't want to give them up, but breaking a fixed mortgage early can mean a penalty in the thousands. A second mortgage is the usual alternative.
Neither option is always cheaper. The worked example below puts the same situation through both and shows where the break-even falls.
A second mortgage is registered on title behind your first. Most lenders cap the combined total at 80% of the home's value; some private lenders go higher, at a higher cost. Terms are usually short — often one year — and many are interest-only, with lender and broker fees on top of legal costs.
Check how your first mortgage is registered. If it's a collateral charge registered for more than you owe, a second lender may not be able to register behind it. We review your first mortgage terms before recommending a second.
Related: Second mortgage rates in Ontario, Refinancing: rates vs. fees vs. penalties
A Collingwood homeowner owes $320,000 at 3.99% fixed with 21 years of amortization and two years left in the term. They need $50,000 to clear cards and a line of credit. The bank's written penalty quote is $11,800.
Break the first mortgage, pay the penalty, and start one new mortgage for everything.
Leave the 3.99% mortgage alone and add a one-year interest-only second until renewal.
Rates in this example are illustrations, not quotes. Payments use Canadian mortgage maths (interest compounded semi-annually).
Lenders generally let your total mortgage reach 80% of your home's value when you refinance. Using the MLS® Home Price Index benchmark for a typical home from the Toronto Regional Real Estate Board's August 2026 report:
| Area | Typical home (benchmark) | 80% of value |
|---|---|---|
| Simcoe County (all areas) | $775,100 | $620,080 |
| Barrie | $624,700 | $499,760 |
| Orillia | $504,600 | $403,680 |
| Innisfil | $666,400 | $533,120 |
| New Tecumseth | $761,400 | $609,120 |
| Bradford | $958,400 | $766,720 |
| Collingwood | $625,000 | $500,000 |
| Wasaga Beach | $590,000 | $472,000 |
| Midland | $489,600 | $391,680 |
Subtract what you owe to see your approximate room. Your own appraisal decides the real number. See the full Simcoe County market report.
Not by itself. It's a short-term tool that makes sense when it protects a low first-mortgage rate or avoids a big penalty, and there's a clear plan to pay it off or fold it into the first mortgage. Without an exit plan, it gets expensive.
Most lenders cap the first and second combined at 80% of the home's value. Some private lenders go higher, at a higher rate and fee.
A noticeably higher rate than a first mortgage, plus lender or broker fees and legal costs. The exact numbers depend on your equity, credit and the lender — we show you the full cost before you decide.
Terms vary. Some seconds are open, others charge interest for a minimum period. We confirm the prepayment terms in writing before you sign.
Yes. A second mortgage is registered on title, and some first mortgage terms require you to tell the lender. We check your first mortgage terms first.
More: Home equity loan vs. refinance, Private mortgages: what to understand first, Debt consolidation calculator, Refinance break-even calculator, Simcoe County market stats (updated monthly).
Written by the TMC Greater Simcoe mortgage team, Orillia, Ontario. Last updated 2026-10-20. General information, not personal financial, tax or insolvency advice. Book a free consultation: 705-238-1097.