For those claiming to go with a sole proprietorship, you can do an LLC and file your taxes as a sole proprietorship. Technically, the IRS does not recognize an LLC for filing purposes. Based on your state, an LLC can be set up for a sole proprietorship, partnership or even corporation. It's not the same for all states.
The LLC is only the legal form for asset protection, it's not the filing form. So, if you want personal asset protection and are going to be a sole proprietor, form an LLC. You can still file your federal taxes as a sole proprietor, so you can take any losses against ordinary income. If you don't form an LLC and you are a sole proprietor, your personal assets are subject to liability.