RESOURCES Federal and Pennsylvania Resources (Click on the links and they will take you to the websites) Internal Revenue Service (IRS)PA Dept. of Revenue - myPATHEFTPS (Payment of Federal Taxes)Keystone Collections Group - Certificate of ResidencyKeystone Collections Group - Local Services Tax Exemption ApplicationFederal Labor Law PostersPennsylvania Labor LawsSocial Security OnlineMortgage CalculatorApplication for Employer Identification Number (EIN)