If you are working from home in Canada (as a self-employed individual), you can claim some of those expenses on your taxes entirely, and a portion of some others.

I can write off my entire phone and internet bills and all office supplies. I can also include a portion of my rent (or mortgage) and utilities proportional to the size of my office and the total square footage of the dwelling. The actual list of claim-able expenses does not end there.

I also burn a hell of a lot less fuel since I have no commute.