If possible, fow & where to add the above title?
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For a final T1 return the CRA e-file manual states: "For deceased clients, do not include "The estate of the late" in the client’s first name." The 2019 e-filer guide can be found here
If the taxpayer is deceased for example in a final return for the year of death, CRA will know they are dealing with the estate
Hope this helps