2018 GAS-1278 International Fuel Tax Agreement (IFTA) Fuel Tax Rates IFTA Fuel Tax Rates for 2018 Returns Documents gas 1278 4th quarter 12 10 18 web v1 final gas 1278 3rd quarter 9 10 18 web v2 final gas 1278 6 5 18 web v3 2nd qtr final gas 1278 3 18 web Related Content GAS-1276 International Fuel Tax Agreement (IFTA) Return