Please make sure that you have answered “Yes” to the question “Will you claim employment expenses for working at home due to COVID-19 for income on this T4?” at the bottom of your T4 slip. To do this in TurboTax, select Find (the magnifying glass icon). Type “T4” in the search bar. Select it from the list, then click “Go”. Click “Edit” next to the slip you want to change. Then you can check your answer at the bottom of the page. Click “Save and Continue” to save your changes.
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If you have TurboTax Live Assist & Review, see this TurboTax FAQ to learn how to talk to a Tax Expert or book a review: In TurboTax Live Assist & Review, how do I talk to a tax expert?