I am starting a side business from a hobby. My main business is an LLC filing as an S-Corp and run from my home. My side business is a Sole-Proprietorship. Can I use some of the same equipment for both businesses and how do I account for this? Office space, computers, printers, desks, car mileage, etc? I know of people running multiple businesses and can't imagine they own separate computers, desks, etc, for all of them.