You can't add the 2025 OAS to 2024. You will need to do a final return for her next year.
@Delphision Sorry for your loss. The due date to file the Final Return and pay a balance owing is:
CRA Filing taxes for deceased.
Since she passed away in 2025, you will add that information on Tax Year 2025 not for the Tax Year 2024.
Thank you for choosing TurboTax.
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