Ask a business owner why he or she restructured their business from a sole proprietorship to some other entity — C-corp, S-corp, LLC, ESOP — and the first answer is always: liability. In a sole proprietorship (even a partnership) you, the owner(s), are the business. If, for example, you shortcut building practices or use unlicensed trade partners and something goes wrong, it is you and your personal assets that the insurance companies will go after.