We have selected various links to assist you in managing your business in Pennsylvania / Philadelphia areas.   Chambers of Commerce Chester County Chamber of Business & Industry The Main Line Chamber of Commerce Perkiomen Valley Chamber of Commerce Spring-Ford Chamber of Commerce   Federal / State / Local Tax Authorities Internal Revenue Service Pennsylvania Department of Revenue Pennsylvania Department of Labor & Industry Philadelphia Department of Revenue Berkheimer Tax Administrator Municipal Tax Information   Associations Institute of Management Accountants Financial Executive International Black Horse Management Team NetWorks! of Tri–County   Accounting Software Affiliates Peachtree by Sage Microsoft Office Small Business Accounting