Take over a seller's below-market rate mortgage — a rare but valuable opportunity in 2026
When a homeowner sells their property, their mortgage doesn't automatically disappear. In theory, a buyer can "assume" the existing mortgage — taking over the loan with all its existing terms intact. In practice, this requires the lender's approval and the buyer meeting the lender's current qualification criteria. The seller is typically released from liability only when the lender formally approves the assumption.
Sellers who locked in mortgages at 2019–2021 rates (1.5%–3.0%) hold a potentially valuable asset: a below-market rate mortgage. In 2026, with 5-year fixed rates around 4.29%, a buyer who can assume a seller's 2.59% rate saves approximately 1.70% per year — on a $400,000 balance, that's $6,800/year or $567/month. This creates an opportunity for buyers who specifically seek properties with assumable mortgages, and for sellers who can use their below-market rate as a negotiating advantage.
The buyer must qualify for the mortgage under the lender's current criteria, including the stress test. If the lender approves, the mortgage assumption proceeds. If not, the buyer cannot assume the mortgage regardless of the agreement between buyer and seller. Different lenders have different willingness to approve assumptions — some are more flexible than others, and monoline lenders may be more restrictive than big banks.
If the property is worth more than the assumable mortgage balance, the buyer must cover the gap in cash. For a $700,000 property with a $380,000 assumable mortgage, the buyer needs $320,000 in cash or through other financing. Often, buyers will take a second mortgage for the gap — though second mortgages come with higher rates. The calculation is: is the savings on the assumed first mortgage greater than the cost of the second-mortgage premium?
As a seller, a below-market assumable mortgage is a marketing advantage. You can legitimately ask for a price premium above the market price — equivalent to the interest savings the buyer captures over the remaining term. As a buyer, recognize this value but negotiate the premium based on your own calculations, not the seller's. The gap financing cost and lender approval risk must be factored into your offer.
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Get KOHO Free — Code 45ET55JSYALast updated: March 2026. Not financial advice. Rules vary by lender and province.