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. May 10, 2017 19:20 Related articles What are the new refund tax rates for gasoline and diesel? Has the undyed diesel tax rate increased? Has the undyed diesel tax rate increased? Who is entitled to the tare allowance for motor fuel taxes? Can I file my IFTA return online?