Missouri Republicans divided over gas tax increase Under the bill, the gas tax would increase 2.5 cents a year until the tax hits 29.5 cents per gallon in 2025. Drivers could get a refund if they save their receipts Author: Summer Ballentine (Associated Press) Published: 10:47 PM CDT May 11, 2021 Updated: 10:47 PM CDT May 11, 2021 JEFFERSON CITY, Mo. — Debate over whether to raise Missouri's gas tax to pay for roads and bridges divided House Republicans Tuesday as lawmakers near their Friday deadline to pass bills. At issue is a contentious proposal that would raise the state's 17-cent gas tax for the first time in decades. Under the bill, the gas tax would increase 2.5 cents a year until the tax hits 29.5 cents per gallon in 2025. Drivers could get a refund if they save their gas receipts.