New entity filing forms are available on the "Initial Forms" tab. (opens in a new tab).In this article, we discuss how to write a conformational letter, look at sample templates for formal and informal confirmation letters and share some tips. This contract will be awarded to a Successful. Tax Forms, Work From Home - Local Services Tax and Payroll Expense Tax Information(PDF, 245KB), Important Information for City of Pittsburgh Taxpayers. Thank you for applying for an Employer Identification Number (EIN).