Form CT-1120: Connecticut Corporation Business Tax Return - Guide / Form
Form used to compute tax both on a net income basis and on a capital stock basis.
Tax is paid on whichever yield is higher. The minimum tax to be paid is $250.

Tax Forms and Instructions for Corporations
Helps define what a C-Corporation is and some of the inherent risks their owners must deal with, like double taxation. Also gives helpful information to determine some of the forms you may be required to file.