In order to claim Home Office Expenses, you will need a completed and signed T2200 - Declaration of Conditions of Employment stating that you must perform 50% or more of your duties from your home.
There are different deductions available for Salaried Employees and Commission Employees which can be found in this CRA guide: https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/t4044/employment-ex...
