Relating to methods of determining taxpayer business activity in state; and prescribing an effective date.

Removes functional test for purposes of apportionment of business income of corporate excise taxpayer by defining "sales" to exclude amounts that are received by taxpayer from certain transactions, received in role as agent or held in trust. Authorizes Department of Revenue to designate other exceptions by rule. Applies to tax years beginning on or after January 1, 2018. Takes effect on 91st day following adjournment sine die.