Income tax; requiring reduction of rate upon certification of excess collections. Effective date.

SB 1856 requires Oklahoma to automatically reduce the top individual income tax rate if state tax collections exceed the previous year's total by a specified threshold. It directly affects all Oklahoma residents and nonresidents who pay state income tax, as it triggers rate reductions based on certified excess collections. The bill amends tax code provisions to establish clear calculation methods for determining when and by how much the top marginal tax rate must decrease. This creates a concrete, automatic policy change tied to actual tax revenue performance, rather than legislative action.