Mortgage Portability in Canada, Explained

A portable mortgage in Canada lets you move your existing mortgage — the same rate, term and balance — to a new property when you sell and buy, as long as your lender approves the new home and both transactions close within the portability window. Portability is a feature written into some, but not all, Canadian mortgages. If you plan to move before your term ends, it can save you thousands of dollars in prepayment penalties.

What “Portable” Actually Means in a Mortgage Contract

Portability is a contractual right, not a law. Nothing in the federal rulebook forces a lender to let you carry your mortgage to another property. OSFI Guideline B-20 sets the underwriting standards federally regulated lenders must follow, and CMHC mortgage default insurance rules apply if your loan is insured, but portability itself comes down to the terms your lender wrote into your mortgage document.

When a mortgage is portable, you normally keep:

• Your existing contract rate, even if rates have risen since you signed.
• The remaining term and its renewal date.
• Your payment schedule and amortization, in most cases.

You don’t get a free pass on the new property. The lender still appraises it, reviews title, and decides whether to accept it as security. Most lenders require the mortgage balance to stay the same or grow; porting a smaller balance is sometimes allowed, but porting to a much cheaper home can be restricted.

How Portability Works When You Sell and Buy

The mechanics depend on whether your sale and purchase line up. In a normal move, you sell your current home, pay off the existing mortgage, and register a new charge on the new property. Your lender keeps the same rate and term on the amount you port.

Timing is the part that catches people. Many lenders set a portability window — often a set number of days before or after your closing date — in which both transactions must complete. If the gap is too wide, you may need bridge financing, or the lender may treat it as a payout and a new mortgage instead.

Blend and extend

If you need a larger mortgage than your current balance, most lenders let you blend and extend: the ported portion keeps your old rate, the extra amount is funded at today’s rate, and the two are combined into one blended rate with a new term. That blended rate is weighted by the size of each portion, so a small increase barely moves your overall rate.

Portable vs. Breaking Your Mortgage: The Penalty Math

If your mortgage isn’t portable, or you choose not to port it, ending the term early means a prepayment penalty. On a fixed-rate mortgage that’s usually the greater of three months’ interest or the interest rate differential (IRD) — and the IRD can be large when your contract rate sits well above current rates. Variable-rate mortgages are typically charged three months’ interest.

The gap between those columns is why portability matters. Compare the two carefully before you assume breaking is cheaper — see the penalty for breaking a mortgage early and how the IRD is calculated.

The Rules That Trip People Up

• Same lender only. Portability is internal. If you want to move to a different lender, that’s a switch, not a port — read how to switch mortgage lenders in Canada.
• The new property must qualify. The lender appraises it and may decline a property it considers hard to sell, such as some rural or non-standard homes.
• Both deals must close on schedule. Miss the window and the port can be refused.
• Not all mortgages are portable. Some products, and some private or alternative lenders, exclude it entirely.
• Insured mortgages have extra conditions. If your loan carries default insurance, the insurer must also accept the new property.

Porting a Bigger Mortgage: The Stress Test Still Applies

Porting your existing balance usually doesn’t require re-qualifying. Borrowing more does. Any increase in the mortgage amount is treated as new lending, so the lender applies the federal mortgage stress test — the higher of your contract rate plus two percentage points or the published qualifying-rate floor. Confirm the current floor with OSFI or your lender, because it changes.

Lenders also re-check GDS and TDS ratios on the total debt. If your income has dropped since you first qualified, or you’ve added car loans or credit card balances, the extra amount may not be approved even though your original mortgage ports fine. Read the Canadian mortgage stress test explained for the details.

When Portability Is Worth It — and When It Isn’t

Portability pays off most when rates have risen since you signed. Keeping a lower contract rate on the same balance protects your payment and avoids a penalty at the same time. It’s less valuable when rates have fallen: you may be better off breaking the mortgage and taking a new lower rate, especially if the penalty is modest. Run both numbers.

It also has limits. Portability only helps if you’re buying another home in Canada. If you’re selling and renting, relocating abroad, or downsizing to a much cheaper property with a small mortgage, the port may not fit your situation.

How to Use Portability Without Losing Money

1. Check your contract first. Look for the portability clause and the exact wording on timing, eligible properties, and fees.
2. Tell your lender early. Call before you list your home so you know the window and what the new property must satisfy.
3. Get the numbers in writing. Ask for the ported balance, the blended rate if you’re borrowing more, and every fee.
4. Compare against breaking. Ask for the payout penalty in writing so you can weigh it against staying with your current lender.
5. Line up your closings. Align sale and purchase dates, or arrange bridge financing if they can’t match.
6. Re-check your budget. Use the rent vs buy calculator and review GDS and TDS ratios before committing.

Portability is a useful feature, but it isn’t automatic and it isn’t free. Read the clause before you need it, and confirm every current figure with your lender rather than relying on general guidance.