GAS TAX BILL & TAX REFORM MEASURES A Louisiana House panel Tuesday narrowly approved a bill that would raise the state’s gasoline tax by 17 cents per gallon…a move that’s expected to raise a half-billion in state aid for roads and bridges. For now, La. motorists pay 38.4 cents per gallon in taxes, including 20 cents in state charges.. a rate that hasn’t changed in 20 years. Gov. John Bel Edwards, whose transportation task force in December recommended a $700 million hike, said he was "extremely encouraged" by the committee vote.