Washington Revised Code Title 82. Excise Taxes § 82.04.240. Tax on manufacturers

Upon every person engaging within this state in business as a manufacturer, except persons taxable as manufacturers under other provisions of this chapter; as to such persons the amount of the tax with respect to such business shall be equal to the value of the products, including by-products, manufactured, multiplied by the rate of 0.484 percent.

The measure of the tax is the value of the products, including by-products, so manufactured regardless of the place of sale or the fact that deliveries may be made to points outside the state.