Based on the recently updated Retailers Motor Fuel Gallons Annual Report, the motor fuel tax rate for B-11 or Higher previously communicated on June 12, 2023 has changed. – Prior to July 1, 2020, the Iowa Department of Revenue used gallon totals from the Iowa Fuel Tax Monthly Report to determine tax rates for motor fuel and special fuel. Beginning July 1, 2020, the Department started using gallon totals from the Iowa Retailers Fuel Gallons Annual Report, resulting in tax rate changes to select fuel types.