Refinancing Your Mortgage in Ontario: The 80% Cap, Prepayment Penalties, and How It Differs from Renewal & Porting
Refinance, renewal, and porting are three different things — knowing which is which can save you thousands
What is mortgage refinancing?
Mortgage refinancing means breaking your existing mortgage before the term ends — or replacing it at renewal — with a brand-new mortgage in order to access home equity or change the amount, rate, or amortization. In Canada, a refinance is capped at 80% of your home’s current appraised value.
Source: OSFI / CMHC (2025)
Plenty of GTA homeowners use the words refinance, renewal, and porting interchangeably — and it costs them. Confuse them and you can pay thousands in avoidable prepayment penalties or miss a chance to tap equity. Here is how the three differ, where the 80% ceiling sits, and the one number people always overlook: the penalty.
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Step 1: Figure out how much equity you can actually pull out (the 80% cap)
Step 2: Get clear on why you’re refinancing
• Debt consolidation — rolling high-interest credit cards or loans into your lower-rate mortgage to free up cash flow
• Renovation — using equity to upgrade, which often adds value back to the home
• Investment or a down payment — pulling cash for a rental property or to help a family member buy
• A lower rate — if your current rate is well above market, refinancing can pay off even after a penalty
The point: a refinance borrows against equity you already own. You’re converting real estate into cash, so the new payment has to be one your budget can carry.
Step 3: Price the prepayment penalty — the most expensive hidden line
🚨The costliest trap: the fixed-rate IRD. In a falling-rate year the IRD can dwarf three months’ interest — anywhere from thousands to tens of thousands of dollars. Before you break a fixed mortgage, insist on a written penalty estimate calculated with the lender’s published formula. Never rely on a verbal number.
💡 One line to remember: fixed-rate = greater of 3 months’ interest or IRD; variable-rate = usually just 3 months’ interest. When rates have fallen since you signed, the IRD balloons, and a fixed-rate penalty can run into the thousands or tens of thousands. Always get the penalty in writing, calculated by your lender’s own formula, before you sign anything.
Refinance vs. renewal vs. porting — stop treating them as the same thing
These three get mixed up constantly, but they cost wildly different amounts:
• Refinance — mid-term, you take out a brand-new mortgage to change the amount, rate, or amortization, or to pull equity. Can trigger a prepayment penalty and is bound by the 80% cap.
• Renewal — at the end of your term you sign a new one. There is no prepayment penalty; you’re renegotiating the rate, not the loan amount, and not pulling equity.
• Porting — when you move, you carry your existing rate, balance, and remaining term to the new home, staying with the same lender. Done right, it usually avoids the prepayment penalty — but you cannot port to a different bank.
ℹ️Money-saver: if your term is nearly up, adjust at renewal instead — renewals carry no prepayment penalty. If you’re moving, ask your lender whether you can port the mortgage; that avoids the penalty too.
Don’t forget the ‘small’ costs: appraisal, legal, discharge
Beyond the penalty, a refinance carries a string of fees. Amounts vary by lender and situation, but GTA homeowners typically see: an appraisal fee (the lender confirming current value, commonly around $300–$600), legal / notary fees (registering the new mortgage, commonly around $700–$1,200), and a discharge fee (closing out the old mortgage, commonly around $200–$350 — often waived if you stay with the same lender). These are typical market ranges; your actual quote governs. Add them to the penalty to see the true cost of getting in the door.
When is refinancing actually worth it? A simple decision framework
• Do the savings beat the total cost? Put the interest saved (lower rate) plus interest saved (consolidated high-rate debt) on one side, and penalty + appraisal + legal + discharge on the other.
• Will you stay in the home long enough? If you’re selling within a year or two, you won’t amortize the cost and it rarely pencils out.
• Can you just wait for renewal? If your term is nearly up, waiting to act at renewal often skips the penalty entirely.
Refinancing is a tool, not a goal — do it only when the net benefit is positive and your cash flow genuinely improves.
One exception worth watching: the insured refinance for secondary suites
The standard refinance ceiling is 80% of value, but there’s a newer exception. Under rules from the Department of Finance and CMHC (in effect January 15, 2025), homeowners refinancing to build a compliant secondary suite — a self-contained basement unit with its own entrance, a laneway home, and so on — can access an insured refinance up to 90% of the improved property value (home value capped at $2M), with amortization extendable to 30 years (an added insurance premium applies). For GTA owners looking to add a rental unit, it’s a path worth researching.
Frequently Asked Questions
How much can I borrow when I refinance?
According to OSFI and CMHC (2025), a refinance in Canada is capped at 80% of your home’s current appraised value. The equity you can access = appraised value × 80% − your current mortgage balance. You cannot refinance above that 80% line.
Is the prepayment penalty different for fixed vs. variable mortgages?
Yes, often substantially. A closed fixed-rate mortgage charges the greater of three months’ interest or the Interest Rate Differential (IRD). A closed variable-rate mortgage usually charges just three months’ interest. When rates have dropped, the fixed-rate IRD can be several times larger.
What’s the difference between refinancing, renewing, and porting?
Refinancing replaces your mortgage mid-term (can access equity, may carry a penalty, capped at 80% LTV). Renewal happens at the end of your term (no penalty, no equity access — just a new rate). Porting moves your existing rate and balance to a new home while staying with the same lender (usually avoids the penalty).
Besides the penalty, what does refinancing cost?
Typical additional fees include an appraisal (around $300–$600), legal/notary work (around $700–$1,200), and a discharge fee (around $200–$350, often waived if you stay with the same lender). These are common market ranges; your formal quote governs the actual amounts.
When does refinancing make financial sense?
When the interest you’ll save (from a lower rate, plus consolidating high-rate debt) clearly exceeds the total of penalty + appraisal + legal + discharge, and you’ll stay in the home long enough to amortize that cost. If your term is nearly up, waiting until renewal usually skips the penalty altogether.
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · GUILD Elite
VP & Branch Manager, Bay Street Group Inc.
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