Assumable Mortgage

An assumable mortgage is an existing mortgage that a property buyer can take over from the seller, with the lender's consent, instead of arranging brand-new financing. The buyer steps into the seller's remaining balance, interest rate and remaining term, and the lender must approve the change because the original borrower is being replaced on the contract.

How an assumption works in Canada

Not every mortgage can be assumed. Whether it can depends on the lender and the wording of the mortgage contract — some closed mortgages restrict it, while others permit it with conditions. Where assumption is allowed, the process usually follows a similar shape:

• The buyer applies to the existing lender and provides credit, income and down payment documentation.
• The lender underwrites the buyer under its own standards, and where the mortgage is insured, mortgage default insurance rules also apply.
• If approved, the buyer assumes the outstanding balance, the existing rate and the remaining mortgage term.
• Any gap between the assumed balance and the purchase price is covered in cash or through separate financing.

Assumptions tend to be most attractive when the seller's rate is lower than what a new mortgage would cost today. The buyer inherits that rate for the rest of the term, and the seller may avoid the prepayment penalty that breaking the mortgage would otherwise trigger. Lenders commonly charge an assumption or transfer fee, so confirm the costs before relying on this route.

Why it matters to a buyer

An assumption is not automatic, and a lender is not obligated to release the seller. The buyer must usually still qualify under the lender's affordability standards, which can include the federal mortgage stress test and GDS/TDS ratios. Being approved to assume a mortgage is therefore different from simply being added to title.

Buyers should also plan for any shortfall, since a separate second charge may carry a higher rate than the assumed first mortgage. Sellers should confirm in writing that the lender has released them from the covenant, because an assumption without a release can leave the original borrower liable if the new owner later defaults. In some cases, mortgage portability on the seller's side may be another option worth comparing.