IRS Form 851, Affiliations Schedule, is a form that a parent corporation of an affiliated group should submit in addition to its consolidated income tax return.
The purpose of submitting Form 851 is to report information about overpayment credits, estimated tax payments, and tax deposits, related to a common parent corporation and their subsidiary corporations. An 851 Form allows the identification of a common parent corporation and each subsidiary corporation and to define that each one of them can be qualified as a member of the affiliated group.
This form was released by the Department of the Treasury Internal Revenue Service and the latest version was issued in October 2016. A fillable 851 Form is available for download below.