3. Fuel used by farmers to produce agricultural products: Purchases by farmers of diesel, biodiesel, or aircraft fuel are exempt from sales/use tax if the fuel is for nonhighway use and is used to produce agricultural products by farmers or persons providing horticultural services for farmers. The exemption also applies to fuel blends if all of the component fuels of the blend are otherwise exempt if sold separately. The exemption for diesel and aircraft fuel took effect March 6, 2006. The exemption for biodiesel took effect May 11, 2007.
The sales/use exemption does not apply to uses other than producing agricultural products or providing horticultural services. To claim the sales tax exemption, a farm fuel user must give the seller a completed Farmers’ Retail Sales Tax Exemption Certificate. RCW 82.08.865; RCW 82.12.865