Yes, the mileage used within the scope of employment, and not just commuting to and from your workplace, can be claimed. Look below for a more detailed description of the criteria needed to claim mileage.
1. Go to the search bar in the top right and enter “job expenses, employee”
2. Select “Jump to job expenses, employee”
3. Enter your occupation and proceed to answer the questions
4. When you arrive to “Any Vehicle Expenses or Sales?” select “Yes”
5. Continue answering the questions and enter the business mileage for your vehicle