Two features of Canadian mortgages that most buyers never think about until they need them: portability and assumability. Understanding both before you commit to a mortgage can save thousands of dollars and avoid a forced break of your existing rate when life changes mid-term.
What Is a Portable Mortgage and How Does It Work?
A portable mortgage lets you transfer your existing mortgage — rate, term, and balance — from your current property to a new one when you sell and buy simultaneously. Instead of breaking the mortgage and paying a penalty, you carry it forward to the new purchase.
Portability is a lender-specific feature, not a universal right. Most major bank and monoline fixed-rate products are portable, but the terms vary significantly. Key details to confirm before you commit:
- Porting window: the gap between your sale closing and your purchase closing must fall within the lender’s allowed window — typically 30–120 days depending on the lender. Missing the window means you break the mortgage and pay the penalty.
- Qualification on the new property: porting does not exempt you from requalification. The lender will underwrite the new purchase at current stress test rates. If your income or credit has changed since the original approval, you may not be approved to port.
- Blend-and-extend: if the new purchase requires a larger mortgage than the existing balance, the additional amount is funded at current rates and blended with your existing rate for the remaining term. This is often called a blend-and-extend or blend-and-increase.
What Is an Assumable Mortgage and How Does It Work?
An assumable mortgage lets a buyer take over the seller’s existing mortgage — same rate, same term, same remaining balance. For buyers, this is most valuable when interest rates have risen since the seller funded: assuming a mortgage at 2.50% when current rates are 5.00% saves the buyer several hundred dollars per month.
In Canada, most mortgages are assumable unless the mortgage agreement specifically prohibits it, but assumption is not automatic — the lender must approve it, subject to full credit and income underwriting of the new buyer. The original borrower is typically released from liability once the lender approves the assumption and provides a written release.
Key mechanics:
- The buyer assumes the remaining balance at the original rate and term
- If the purchase price exceeds the assumable balance, the buyer needs to fund the difference — either from cash, a second mortgage, or a new first mortgage blended with the assumed portion
- The lender fully underwrites the assuming buyer; the original borrower’s credit is not a factor in the assumed mortgage going forward
How Do Porting and Assuming Compare Financially in Kelowna?
The financial case for porting or assuming depends on current rates versus the rate on the existing mortgage.
When porting makes sense: if your existing fixed rate is below current market rates, porting saves the IRD penalty (potentially $10,000–$30,000+ depending on mortgage size and rate differential) and preserves a rate below what you could get today. The cost is timing complexity — both transactions must close within the lender’s porting window.
When assumption makes sense (for buyers): if rates have risen since the seller funded, you acquire below-market financing. On a $400,000 assumed balance at 2.75% versus a new mortgage at 5.00%, the monthly saving is approximately $530. Over a remaining 3-year term, that is roughly $19,000 in interest savings.
When neither makes sense: if current rates are below the rate on the existing mortgage, breaking and refinancing at a better rate produces a better outcome — once the penalty is netted out.
How to Port a Mortgage Step by Step
- Notify your broker and lender as soon as your property is listed — before you have a firm sale date. Confirm the porting window and obtain the lender’s written porting policy.
- Once your sale is accepted, coordinate the closing dates so the purchase closes within the porting window. Most Kelowna transactions can be structured to close within 30–90 days.
- Submit a new mortgage application for the purchase property. The lender underwrites you as a new borrower — income verification, credit check, and stress test all apply.
- If the new mortgage amount is higher than the existing balance, the lender blends the rates. Get the blended rate in writing before signing.
- Both closings complete through your lawyer or notary. The mortgage is discharged from the sold property and registered on the new one.
What Should Sellers Confirm Before Listing?
- Written confirmation from your lender that the product is portable and the porting window
- Current outstanding balance and remaining term
- Prepayment penalty estimate if the port does not work out (so you know the downside)
- Whether portability extends to all property types — some lenders do not allow porting to recreational or investment properties
What Are the Typical Porting Timeline and Costs?
Timeline: plan for a simultaneous close or a same-week close to meet most porting windows. Some lenders allow up to 120 days between closings; others cap at 30–60 days. Costs: legal fees for two closings, title insurance on the new property, any appraisal required on the new property ($400–$700). Porting itself does not carry a direct fee at most lenders — the saving is the avoided penalty.
How to Assume a Mortgage Step by Step
- Confirm with the seller’s agent that the property has an assumable mortgage and obtain the basic terms: rate, remaining term, approximate balance.
- Contact your broker. We verify the lender’s assumption policies and confirm whether the lender releases the original borrower on approval.
- Submit a full mortgage application to the original lender. They underwrite you as the new borrower — credit score, income, GDS/TDS ratios, and stress test all apply.
- Fund the purchase price gap between the assumed balance and the purchase price through cash, HELOC, or a new second mortgage. Your broker structures this alongside the assumption.
- Legal transfer is completed through a BC lawyer or notary; legal fees are similar to a standard purchase plus a transfer/assumption fee charged by the lender (typically $200–$500).
What Lender Approval Requirements Apply in Kelowna?
Whether porting or assuming, the lender performs full underwriting of the new borrower. Standard requirements in BC:
- Minimum credit score — typically 620+ for insured mortgages, 680+ for conventional files
- Income verification: T4 slips and recent pay stubs, or two years of NOAs for self-employed
- GDS/TDS ratios within lender maximums, tested at the stress test qualifying rate
- Property must meet lender and insurer guidelines — strata bylaws, rental restrictions, and property condition apply
Transfer Fees and Balance Adjustments for Assumptions
When a buyer assumes a mortgage, several adjustments flow through the closing statement:
- Principal balance adjustment: the buyer assumes the balance as of the closing date, not the original amount. The lender provides a current balance statement to the seller’s lawyer.
- Prepaid interest adjustment: mortgage interest is paid in arrears in Canada. The allocation of the month’s interest between seller and buyer is calculated by the lawyers and flows as a closing adjustment.
- Assumption/transfer fee: the lender charges a fee to process the assumption and update the mortgage registration. Typically $200–$500.
- Land Title transfer: the standard BC PTT applies on the full purchase price regardless of whether the mortgage is assumed. First-time buyers may still qualify for the PTT exemption on assumptions.
Legal and Liability Risks for Buyers and Sellers
For sellers: if the assuming buyer defaults and the lender cannot recover the full balance, the original borrower may remain liable if the lender did not provide a written release. Always confirm — in writing, from the lender — that you are released from the mortgage on closing. Not all lenders release the original borrower automatically; some require an explicit request.
For buyers: you are taking on the existing mortgage terms, including any prepayment restrictions from the original commitment date. Read the existing mortgage commitment carefully before proceeding — unusual clauses from the original approval date carry forward.
Portable vs Assumable Mortgage FAQs
Questions we hear when clients are deciding between porting, assuming, or breaking their mortgage.
Are assumable mortgages available in Canada?
Yes. Most Canadian mortgages are assumable unless explicitly stated otherwise in the mortgage agreement, but the assuming buyer must fully qualify with the lender. The lender decides whether to approve the assumption; it is not automatic. Most major bank and monoline mortgages permit assumptions subject to underwriting. Credit union mortgages vary by institution.
How does an interest-rate gap affect an assumption?
The entire financial case for an assumption rests on the rate gap. If the assumable rate is significantly below current rates, the buyer saves substantially on monthly payments and total interest. If current rates are similar or lower than the assumable rate, there is no financial benefit — and the buyer is better served with a fresh mortgage at the best current rate.
Will assuming a mortgage change my future porting options?
Portability is a feature of the original mortgage product and term. If the assumed mortgage is portable under the original commitment terms, those rights carry forward to you as the assuming buyer — subject to the lender’s agreement. Confirm porting eligibility with the lender at the time of the assumption.
Does mortgage insurance transfer when a mortgage is assumed?
If the original mortgage was insured (CMHC, Sagen, or Canada Guaranty), the insurance policy transfers to the assuming buyer. The assuming buyer does not pay a new premium on the assumed balance. If the purchase price requires additional financing above the assumed balance, that new portion may be subject to its own insurance requirements depending on LTV and product type.
How does my credit score affect assumption approval?
Significantly. The lender underwrites you as a new borrower. A credit score below 620 will make most A-lender assumptions difficult. B-lenders and credit unions may have more flexibility but will price the risk into the terms. Start the assumption process early enough to address any credit issues before the closing deadline.
To evaluate whether porting, assuming, or breaking your mortgage is the right move, contact Michelle Scheibel at My Kelowna Mortgage. She is licensed by the BC Financial Services Authority and models all three scenarios before recommending a direction.