July 2017. Illinois. To withdraw your foreign corporation in Illinois, you must complete and submit BCA 13.45, Application for Withdrawal and Final Report form in duplicate.Forms on this website are PDF forms with fillable fields. The forms should be downloaded to your computer before filling in the fields. Instructions for these attachments appear throughout the specific instructions for completing your return. You must complete all lines of Illinois Schedule B, as applicable, and file it with your Form IL-1065. What if I am a member of a unitary group? All Your Forms In One Place. Find the documents you need with the links below. If it is during the summer term, and it is your only course, you will be required to fill out a withdrawal form instead of this petition.