In the initial few interview screens TurboTax will have a question for each taxpayer on the return that will read "Do any of these apply to "Taxpayer"?
One of the options here is "Passed away before filing this return". Select this checkbox to enter the date of death and continue the return. The additional details that will be required will depend on the filing status of the return (joint or individual), but TurboTax will walk you through this.
@matieppo
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