New entity filing forms are available on the "Initial Forms" tab. Instructions for registering a business in Philadelphia, including how to choose your business structure and get a City tax account number.There are a few different ways to file your forms with the Pennsylvania Secretary of State, Corporations Bureau: Online using the PA Business One-Stop Shop. To register a foreign nonprofit in the State of Pennsylvania, you must file an Application for Certificate of Authority form and Docketing Statement. To register to do business in Pennsylvania, a corporation or LLC must submit a signed foreign registration statement to the DOS.