Mortgage Portability Basics

Move-with-your-mortgage decision

A portable mortgage can preserve a good contract—but the new purchase still has to work

A portable mortgage can let a homeowner move an existing mortgage to a new property instead of automatically breaking the contract. But portability is **not a guarantee that the mortgage follows the borrower to any home**. The lender can still need to approve the borrower, the new property, the amount required and the timing. A useful portability analysis therefore asks two questions at once: **Can the existing contract be preserved?** and **Does the new purchase still qualify on its own facts?**

What actually moves when a mortgage is ported?

FCAC describes a portable mortgage as a mortgage that may allow the borrower to transfer the existing mortgage balance, interest rate and contractual terms and conditions to another home. The attraction is obvious when the current mortgage has a favourable rate or when breaking a closed mortgage could create a material prepayment charge.

But the property securing the mortgage changes. The lender is not simply changing an address in its system. It is replacing one piece of real-estate security with another and may also be changing the total amount being borrowed. That is why portability normally remains subject to the mortgage contract and the lender's approval of the new transaction.

The most useful mental model is: portability preserves part of an existing contract while a new property transaction is being underwritten around it.

What may be preserved—and what still changes

Part of the transaction	What portability may preserve	What still has to be dealt with
Existing mortgage	Some or all of the balance, existing rate and remaining term, subject to the contract	The lender's exact port rules and timing
Borrower	Existing lender relationship	Current qualification for the new transaction may still be required
Property	Nothing about the old property itself transfers	The new property must be acceptable security
Loan amount	Existing balance may form the ported portion	Any increase, decrease or partial payout needs lender-specific treatment
Closing	Potential avoidance of breaking the old mortgage	Sale and purchase dates, lawyer instructions and funding still have to line up

Why portability can become valuable

Portability is most valuable when the existing mortgage contains something worth preserving. That may be a below-current-market contractual rate, attractive prepayment privileges, a favourable remaining term or simply the avoidance of a prepayment charge that would otherwise arise when the property is sold before maturity.

The benefit should still be measured in dollars and constraints. A port that saves a penalty can be unattractive if the top-up portion is expensive, the new structure is inflexible, the borrower needs a feature the old contract does not provide, or the new property cannot fit the lender's rules.

Use the Mortgage Penalty Calculator as an initial screen, then obtain the lender's actual payout or penalty information before making a final decision.

A port usually has to pass four separate tests

A borrower can have a portable mortgage feature and still be unable to complete a particular port. The practical review is broader than asking whether the contract contains the word 'portable'.

The exact rules differ by lender and product, but four questions usually capture the execution risk.

1Contract test. Does this mortgage permit the kind of port being requested, within the required timing and conditions?
2Borrower test. Does the borrower meet the lender's current requirements for the new transaction and any additional borrowing?
3Property test. Is the replacement property acceptable to the lender, including value, condition, type, location and insurability where relevant?
4Amount-and-timing test. Does the required mortgage amount fit the lender's port/top-up rules, and can the sale and purchase close inside the required window?

Sale and purchase timing can determine whether the port works

Portability is highly sensitive to dates. Lenders can impose their own time windows between the sale of the existing property and the purchase of the replacement property. Those windows should be confirmed directly; there is no single universal Canadian port period that can safely be assumed.

If the purchase closes before the old home sells, the borrower may temporarily own both properties and may need a bridge or another source of funds for the down payment. If the old home sells first, the lender may have a process for preserving the port for a limited period, but the contractual requirements must be checked before the old mortgage is paid out.

This is why portability belongs inside the Mortgage Funding Process, not as a decision made after sale and purchase dates are already fixed.

Common timing patterns

Timing	Main issue	Question to solve early
Sale and purchase close the same day	Coordinating payout and new advance	Can lender and lawyers complete the port within one closing sequence?
Purchase closes before sale	Temporary cash/equity gap and possibly two properties	Is bridge financing or another source of closing funds available?
Sale closes before purchase	Old mortgage may be paid out before replacement property is ready	What exact port window and process does the lender allow?
Dates change after approval	Port eligibility or funding instructions may be affected	Does the lender need to reapprove the timing?

Moving to a more expensive or cheaper home changes the analysis

A move rarely requires exactly the same mortgage balance. If the replacement home requires more financing, the lender may allow the existing balance to be ported and provide additional funds under its current pricing and rules. The resulting structure is sometimes described using terms such as a port-and-increase or blended arrangement, but the mechanics vary by lender.

If the new mortgage needs to be smaller than the old balance, part of the old mortgage may have to be repaid. Whether that creates a prepayment charge depends on the contract and the lender's partial-port rules. Never assume that 'portable' also means 'reduce the balance by any amount without cost.'

For a bigger purchase, model the ported balance and the new-money portion separately before looking at any blended headline rate. The Mortgage Payment Calculator and Mortgage Comparison Calculator can help compare the resulting cash flow.

Illustrative structure — not lender-specific pricing

New-home financing need	Existing balance	What must be solved
$450,000	$450,000	Whether the existing balance/rate/term can port as-is
$600,000	$450,000	Whether $450,000 can port and how the additional $150,000 will be priced and qualified
$350,000	$450,000	Whether $350,000 can port and how the $100,000 reduction is treated under prepayment rules

Port versus break-and-replace is an all-in-cost decision

The correct comparison is not simply old rate versus new rate. It is the economic result over the period the borrower reasonably expects to keep the new structure.

A break-and-replace mortgage can create a penalty today but produce a better overall structure. A port can avoid that penalty but preserve a contract that is no longer ideal. Compare the penalty, rate on every dollar borrowed, payment, fees, term remaining, prepayment privileges and likely next transaction.

The Burlington funded file linked below is not a portability case, but it demonstrates the same economic principle: the refinance still made sense after the prepayment penalty was included. Avoiding a penalty is not automatically the lowest-cost decision.

Port or replace? Compare the whole structure

Question	Port existing mortgage	Break and obtain new mortgage
Immediate penalty	May be avoided or reduced if port rules are met	May apply under the old contract
Existing rate	May preserve some or all of it	Replaced by current pricing
Additional funds	Subject to lender's port/top-up method	Entire new amount priced under new mortgage
Remaining term	Often remains tied to existing term mechanics	New term selected
Flexibility	Existing contract features may continue	Opportunity to choose a different product
Best answer	Depends on all-in economics and execution	Depends on all-in economics and execution

A great existing mortgage cannot rescue an unacceptable new property

Portability does not eliminate property underwriting. The lender is taking new security and can require the information it needs to decide whether the replacement property fits the mortgage. Depending on the file, that can involve valuation, property type, condition, location, insurance, condo information or other property-specific review.

A borrower who has already sold the old home can therefore face execution risk if the new property is unusual or the appraisal is lower than expected. If the purchase is still conditional, coordinate the port review with the Condition of Financing rather than treating an existing mortgage approval as approval of the new property.

The most common portability mistakes happen before the lender says no

Most portability problems are foreseeable if the borrower checks the contract, transaction dates and new borrowing requirement early enough. The dangerous assumption is that a mortgage advertised as portable will automatically fit whatever move happens later.

1Confirm that the current mortgage is portable and obtain the lender's exact rules for the proposed move.
2Check the remaining term, estimated break cost and prepayment privileges before deciding the port is valuable.
3Determine the total mortgage required on the replacement property—not just the balance being ported.
4Have the lender review the new property and any additional borrowing early enough to solve problems before closing.
5Confirm the sale/purchase timing and any bridge requirement with the lender and lawyer.
6Ask how a larger or smaller mortgage amount affects pricing, qualification and penalties.
7Compare the port against a fresh mortgage on total dollars, not headline rate alone.

Two funded files show why preserving an existing mortgage can matter

These are not presented as portability transactions. They illustrate the two competing economic forces that make portability valuable: the cost of disturbing an existing contract and the value of preserving one that is worth keeping.

In one Burlington file, breaking the existing first mortgage still made economic sense even after the prepayment penalty, because the lower-rate refinance and debt consolidation produced sufficient overall benefit.

In another Toronto file, the existing low-rate first mortgage was deliberately preserved while a second-position HELOC supplied the required funds. The lesson for portability is the same: existing mortgage economics belong inside the new-transaction decision.

A practical mortgage-portability decision sequence

Portability is best assessed before the sale and purchase dates become difficult to change. The sequence below keeps the contract question, the new-property question and the economics in the same analysis.

1Read the existing contract. Confirm portability, remaining term, prepayment privileges and estimated break cost.
2Describe the new transaction. Purchase price, new property, required mortgage and closing dates all matter.
3Ask the lender for the exact port treatment. Include top-up, partial-port and timing rules where relevant.
4Requalify the new purchase. Do not assume the old approval covers a different amount or property.
5Model the alternative. Compare a fresh mortgage including penalty and fees.
6Stress the dates. Make sure bridge funds, sale proceeds and lawyer instructions can work if closings do not line up perfectly.
7Choose the structure that survives the whole move. The best option is the one that closes reliably and produces acceptable cost and flexibility afterward.

Primary Canadian sources

Sources and verification

FCAC describes a portable mortgage as one that may allow the existing mortgage balance, rate and contractual terms to move to another home. Exact port windows, top-up rules, partial-port treatment, qualification requirements and penalty calculations are lender- and contract-specific, so the actual mortgage agreement and lender confirmation remain decisive.