As gas prices rise across the nation motorists in Illinois should be prepared to pay for a little more gas starting on Thursday. Beginning on Thursday the state’s gas tax increases another half-cent. Currently, the state’s gas tax is $0.387 per gallon. Starting on Thursday, Illinois gas tax will be e $0.392 per gallon. The gas tax saw an automatic increase to $0.387 cents last year. The gas tax doubled in 2019 as part of Governor Pritzker’s “Rebuild Illinois” plan. The Rebuild Illinois plan includes helping pay for statewide construction program for roads, bridges, mass transit, schools and other public works. Illinois drivers paid nearly $400 million more in the first four months of the new tax back in 2019.