We're sorry to hear of your loss.
If you are using TurboTax Online/Do It Yourself and starting a brand new return (no transfer from last year), you'll be asked "Who are you preparing this return for?". Choose "Someone Else". Then when you get to the "Let’s get started! What’s their name?", there is a checkbox for "This return is for a deceased person" under the last name field.
Please note: The CRA requires all final returns to be paper filed. You'll need to print out and mail their return directly instead of using NETFILE. Also note that form T1255 Designation of a Property as a Principal Residence by the Legal Representative of a Deceased Individual is not available in TurboTax Online/Do It Yourself. It is available in TurboTax Desktop (for Windows).
