Illinois Gas Tax Calculator
The Illinois state gas tax is about 66.0¢/gallon. Calculate your total gas tax (state + federal) below.
What is the gas tax in Illinois?
The Illinois state gas tax is approximately 66.0 cents per gallon, which is above the rough national average of around 32 cents per gallon. On top of that, the federal gas tax adds a flat 18.4 cents per gallon everywhere in the US, so drivers in Illinois pay a combined rate on the higher end nationally.
How much gas tax will I pay in Illinois?
Use the calculator above to enter how many gallons you're purchasing and see the exact breakdown of Illinois state tax, federal tax, and total tax on that fill-up.
This is an approximate combined state gas tax rate for estimation purposes — actual rates change periodically and may include additional local taxes not reflected here.
Frequently Asked Questions
What is the gas tax rate in Illinois?
The Illinois state gas tax is approximately 66.0 cents per gallon. Combined with the federal gas tax of 18.4 cents per gallon, use the calculator above to see the total tax on your fill-up.
Is Illinois's gas tax above or below the national average?
Illinois's gas tax of about 66.0 cents per gallon is above the rough national average of around 32 cents per gallon, putting Illinois among the higher gas-tax states.
How much federal gas tax do I pay in Illinois?
The federal gas tax is a flat 18.4 cents per gallon in every state, including Illinois. This is added on top of Illinois's own state gas tax of about 66.0 cents per gallon.
How much tax will I pay on 15 gallons of gas in Illinois?
On 15 gallons in Illinois, you'd pay roughly $9.90 in state gas tax and $2.76 in federal gas tax, for a total of about $12.66. Adjust the gallons in the calculator above for your own fill-up.
Why do gas prices vary within Illinois?
Beyond the state gas tax, local factors like distribution costs, competition among stations, and proximity to refineries or terminals can cause gas prices to vary from city to city within Illinois, even though the state and federal tax rate stays the same everywhere.
Does Illinois's gas tax change often?
It depends on state law — some states adjust their gas tax rate periodically based on inflation or fuel price formulas, while others require new legislation to change the rate. Check Illinois's department of transportation or revenue for the latest updates.
What is gas tax revenue used for in Illinois?
Gas tax revenue in Illinois, like most states, primarily funds road and bridge construction and maintenance, with some states also directing a portion toward public transit projects.