1120-IL: Extending a unitary return

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When the unitary group has C Corporation members and pass-through members (S Corporation and Partnership) the designated agent files Form IL-1120-V on behalf of all C Corporation members if there is tentative tax due. Each S Corporation and Partnership member is required to file their own IL-1120-V if there is tentative tax due.

When the unitary group consists of all pass-through members, each S Corporation and Partnership member is required to file their own IL-1120-ST-V if there is tentative tax due.

Related topic: 1120 Illinois frequently asked questions

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