New entity filing forms are available on the "Initial Forms" tab. Learn about forming and registering your business online, and how to complete other types of business filings.Register your business (opens in a new tab). Corp treatment avoids doubletaxation. It is generally the best choice for small businesses. In this guide, you'll find information on naming your corporation, getting a Registered Agent, the fees you'll need to pay, business taxes and much more. To establish an LLC in Pennsylvania, a Certificate of Organization is required to be filed with the. The Pennsylvania Department of State's website provides a fill-in-the-blank form for articles of incorporation.