The Pennsylvania BCO-10 instructions are a set of forms and instructions issued by the Pennsylvania Department of Revenue for filing a Pennsylvania Business Corporation Tax Return. The forms and instructions are divided into two categories: the Corporate Tax Return forms (BCO-10) and the Corporate Tax Return Instructions (BCO-10 Instructions). The BCO-10 forms include Form BCO-10, the Pennsylvania Business Corporation Tax Return, Schedules A through E, and Form REV-1620, the Corporate Tax Credit Summary. The BCO-10 Instructions provide detailed instructions on how to complete the BCO-10 forms, including information on what is and is not taxable, how to compute taxable income, how to calculate taxes due, and how to obtain the necessary forms. The BCO-10 Instructions also provide information on filing extension requests, payment options, and other related topics.