Missouri’s gas tax is increasing for the first time in over 20 years. Yesterday, Governor Mike Parson signed the tax hike into law, which will raise money for highway and bridge repairs. This gas tax will add 12.5 cents per gallon over five years. The first hike will happen in October. However, Parson said people can get a refund on that tax if they don’t want to pay it. You’ll need to supply certain information to the the Missouri Department of Revenue to do so. The refund will only apply to 2.5 cents per gallon. The gas tax will increase every July until 2026 — topping off at 29.5 cents per gallon.