I don't believe a T1255 is required in this situation. According to CRA on T4011 (Preparing Returns for Deceased Persons 2018) "where the principal residence is transferred to the deceased's spouse, common law partner, or testamentary spousal or common law partner trust, the CRA does not require you to make a principal residence designation for the period before death. Instead, the disposition must be reported and the designation may be made by the surviving spouse, common law partner, or the trust at the earlier of the time of actual disposition or death of the surviving spouse."
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