As a budding entrepreneur, one of the first decisions you'll make is choosing your company's legal structure. And three letters like 'Inc.' can mean much more than a snappy moniker for your brand. Not only will this decision affect your ability to raise capital, it will impact the amount of tax dollars you pay, the personal liability you face, and the pile of paperwork you'll have to do. So before you launch your startup, try these on for size: Inc., LLC, partnership and sole proprietorship. This quiz will help you pick the best one for your business.