Altering certain State income tax rate bracket thresholds by a certain cost-of-living adjustment; altering the amount of certain exemptions allowed under the State income tax for certain taxable years by a certain cost-of-living adjustment; altering the minimum and maximum limitation amounts of certain standard deductions allowed under the State income tax for certain taxable years by a certain cost-of-living adjustment; and applying the Act to taxable years beginning after December 31, 2017.