Mortgage Portability Explained: Move Your Mortgage Without Paying a Penalty

You signed a 5-year fixed mortgage at 2.49% in 2021. Today's 5-year fixed rates are sitting near 4.4%. You want to sell and buy a bigger house — but breaking that 2.49% mortgage will trigger an interest-rate-differential (IRD) penalty of $20,000 or more. Mortgage portability is the feature that lets you keep your current rate and term, move it to the new property, and skip most of the penalty. Here is exactly how it works in 2026.

What "Porting" Actually Means

When you port a mortgage, you are not literally taking the same loan with you. The lender:

1. Discharges the mortgage on your old property at closing
2. Registers a new mortgage on your new property the same day
3. Keeps your existing rate and remaining term in place
4. Often blends in any additional borrowing at current rates

The end result: you save the IRD penalty (which can be massive when rates have risen since you signed) and walk into the new home with the same low rate.

Two Flavours: Port-and-Decrease vs Port-and-Increase

Port-and-Decrease

You are buying a cheaper home and need less mortgage. Your current rate stays. You pay down the difference at closing and may incur a partial prepayment penalty on the amount being shrunk.

Port-and-Increase (a "blended" mortgage)

You are buying a more expensive home and need a bigger mortgage. The lender keeps your current rate on the existing balance and adds new money at today's rate, blending them into one weighted-average rate.

Example. Existing balance $400,000 at 2.49%, 30 months remaining. New mortgage needed: $600,000. Additional $200,000 funded at today's 4.4%. Blended rate:

(400,000 × 2.49% + 200,000 × 4.4%) ÷ 600,000 = 3.13%

You also have a choice — most lenders will let you blend either to the remaining term (30 months) or to a new full term (e.g., 60 months). Blending to a new term is called "blend-and-extend" and resets the maturity date.

When Porting Saves You Money

Run the math: if your IRD penalty is greater than 0.5% of your current mortgage balance, porting almost always wins.

Real example, 2026:

• Current mortgage: $480,000 at 2.49% fixed
• 28 months remaining on 5-year term
• Today's 4-year fixed rate: 4.39%
• IRD penalty calculation (lender's posted-rate method): roughly $22,500

Porting that mortgage avoids the entire $22,500 penalty. The "cost" of porting is just lawyer fees on the new property (which you would have anyway) plus possibly an appraisal of the new home.

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Critical Rules and Deadlines

1. Most ports must complete within 30, 60, 90, or 120 days of the sale of the old property. Different lenders, different windows. Miss it and you owe the full penalty.
2. The new property must qualify under current rules. You will be re-stress-tested on the full new mortgage at the higher of 5.25% or contract + 2%. If your income or debts have changed for the worse, porting can be denied.
3. Same applicants required. Removing or adding a co-borrower (e.g., during separation) usually breaks portability and triggers a discharge.
4. Insurer must reapprove the property if your original mortgage was insured.
5. Some lenders charge a small port admin fee ($150-$500). Most do not.

Lenders That Do — and Do Not — Allow Porting

Almost every A-lender allows porting in some form:

• Big banks (RBC, TD, BMO, Scotia, CIBC, National) — allow porting, typically 90-120 day windows, blend-and-extend available
• Monolines (MCAP, First National, RFA, Strive, Equitable) — allow porting, 30-120 day windows depending on lender
• Some credit unions — allow porting with specific restrictions
• Most private/B-lenders — do not allow porting (mortgages are not portable)

If portability matters to you, make sure your broker confirms it on the term sheet before you sign.

Traps to Avoid

1. Buying before selling, or selling before buying

Some lenders only honour the port if both transactions close on the same day. If you close on the purchase 60 days before the sale, you may inadvertently break the mortgage and trigger the penalty.

2. Switching lenders mid-port

A "port" is to the same lender on a new property. If you change lenders, you are breaking the mortgage and porting nothing.

3. Assuming the rate stays exactly the same on the full balance

Port-and-increase blends. Your headline rate goes up. Run the blended-rate math before you commit.

4. Variable-rate ports

Variable-rate mortgages are often portable too, but the math is simpler — your existing variable spread (e.g., prime - 0.85%) carries forward. New money usually gets today's variable spread. Confirm whether the lender allows the same spread on additional money.

Quick Decision Framework

Ask yourself three questions:

1. Is my current rate at least 0.75% lower than today's rates?
2. Do I have more than 12 months left on my term?
3. Am I qualifying for the new mortgage on income alone (not on the lower stress-test rate)?

If yes to all three, porting almost certainly saves you thousands. If no to any, run the break-vs-port math with a broker before listing.

Bottom Line

Mortgage portability is one of the most underused features in Canadian mortgages. In 2026, with millions of Canadians still holding sub-3% rates, porting is often the difference between making a move feel affordable and abandoning the plan entirely. Before you list your home or write an offer on a new one, get the port quote in writing from your existing lender — and have your broker run the comparison so you know exactly what you are saving.