When Property Passes on Death: Rollover Rules and What Happens to the Mortgage

When property transfers to a surviving spouse or common-law partner on death, it typically qualifies for an automatic tax-deferred 'rollover' — the property passes at its original adjusted cost base, with no immediate capital gains tax triggered. The tax bill isn't avoided, just deferred until the surviving spouse eventually sells or passes it on themselves.

When property transfers to anyone else — an adult child, a sibling, any non-spouse beneficiary — it's generally deemed to have been sold at fair market value immediately before death, which can trigger capital gains tax on the estate for any property that isn't covered by the principal residence exemption (a rental or investment property, for instance).

The mortgage itself does not automatically transfer to the new owner just because the property does. The estate typically needs to either pay out the mortgage from estate assets, or the new owner needs to qualify to assume it or refinance into their own name — lender approval and full underwriting are generally required either way, not an automatic handoff.

This is genuinely estate-lawyer and accountant territory — the interaction between rollover rules, the principal residence exemption, and provincial estate law is easy to get wrong, and the cost of getting it wrong is usually far higher than the cost of proper advice beforehand.