Instructions for registering a business in Philadelphia, including how to choose your business structure and get a City tax account number. 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). In this blog, we are sharing the answers to four of the most commonly asked questions the PA Business One-Stop Shop receives about business registration. Legal advise and agreements for purchasing a business or selling a business. Get our free, updated 2022 checklist for business buyers. Philadelphia VIP's "How-To" Guide for Small Businesses. Note: This guide will serve as an overview of legal topics someone should consider when starting. A guide for businesses needing straightforward answers to Pennsylvania Sales and Use Tax questions and audit guidance. Provides residents, businesses, and visitors to Philadelphia with comprehensive parking management services.