Ind. Code § 6-3.1-13-5
(a) As used in this chapter, "incremental income tax withholdings" means either:
(2) the sum of:
(B) the additional amount that would have been withheld under IC 6-3-4-8 by the taxpayer during the taxable year from the compensation of new employees as if the new Indiana nonresident employees had been Indiana residents;
as determined by the corporation.
(b) The term does not include any amount withheld from an individual or an additional amount described in subsection (a)(2) for an individual for services provided in Indiana as an employee, if the:
As added by P.L.41-1994, SEC.1. Amended by P.L.171-2011, SEC.5; P.L.158-2019, SEC.11.