Has the gas tax rate increased? Yes. Beginning July 1, 2017, the gas tax rate is increased to 24 cents. See important notice 17-08 for rate increases for subsequent years. December 11, 2017 15:47 Related articles What are the new refund tax rates for gasoline and diesel? What is the deadline for filing an omnibus refund claim for petroleum taxes paid on petroleum products that are subsequently sold to a government agency free of tax? Which motor fuel tax forms are required to be filed electronically? Who is entitled to the tare allowance for motor fuel taxes? Has the undyed diesel tax rate increased?