Concerning broadcasters.

HB 1558 imposes a 0.484% tax on the gross income of radio and television broadcasters operating in Washington State. It directly affects broadcasters by allowing them to exclude revenue from network, national, and regional advertising from their taxable income - either through a standard deduction based on U.S. census data or by itemizing out-of-state audience revenue using specific signal strength measurements. The bill defines "broadcasting" broadly to include delivery via wire, satellite, or other means, and clarifies that excluded revenue must be calculated using standardized signal contour thresholds for different broadcast types. This tax change modifies existing business tax rules for broadcasters but does not alter other tax categories covered under the same chapter.