Indiana Code
Chapter 6. Returns
6-5.5-6-1. Annual Returns Required

Sec. 1. Annual returns with respect to the tax imposed by this article shall be made by every taxpayer:
(1) having for the taxable year adjusted gross income or apportioned income subject to taxation under this article; or
(2) that would have had adjusted gross income or apportioned income subject to taxation under this article, but had a loss for that taxable year.
However, taxpayer members of a unitary group are required to file only one (1) return covering all members of the unitary group. The taxpayer member that files the return may be designated by the members of the unitary group pursuant to consents executed by each member. Each taxpayer member of a unitary group is jointly and severally liable for the tax liability of all members of the unitary group.
As added by P.L.347-1989(ss), SEC.1. Amended by P.L.68-1991, SEC.14.