Only what they earned pre-death goes into the final T1 return. Investment income post-death is for the T3 Testamentary trust.
The due date to file the Final Return and pay a balance owing is: April 30 of the year following the death (if the death occurred between January 1 and October 31 inclusive) 6 months following the death, on the same calendar day as the date of death (if the death occurred between November 1 and December 31 inclusive)
For more information please refer to CRA article "Filing a Deceased Return."
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