What is the illinois gas tax 2025 — 48.3¢/gallon?
In short
Illinois's state gas tax is 48.3¢ per gallon. A driver covering 15,000 miles a year at 28 MPG burns about 536 gallons and pays roughly $259/year in Illinois state gas tax — plus the 18.4¢/gal federal tax. Illinois stacks a general sales tax on fuel on top of its 48.3¢ excise, which is why its all-in gas-tax burden is one of the highest in the country.
This page shows Illinois's current state gas tax (48.3¢/gal) and works out how much state fuel tax you pay from your annual mileage and MPG. A 48.3¢ motor-fuel excise PLUS the 6.25% state sales tax applied to gasoline, an Environmental Impact Fee and an Underground Storage Tank Tax — about 66¢ all in. It excludes the 18.4¢/gal federal excise.
How to use this calculator
- 1Illinois's 48.3¢/gal state rate is pre-filled.
- 2Add the miles you drive per year.
- 3Enter your vehicle's fuel economy (MPG).
- 4Read your annual gallons used and the Illinois state gas tax you pay.
The formula
- cents/gallon
- — Illinois state rate: 48.3¢ (all-in state-level ≈ 66.4¢)
- annual gallons
- — Annual miles ÷ MPG
- state tax paid
- — Gallons × state cents ÷ 100
- federal tax
- — 18.4¢/gal — the same in every state
Worked example
The scenario
15,000 miles/year at 28 MPG in Illinois (48.3¢/gal).
The result
15,000 ÷ 28 = 536 gallons. State gas tax = 536 × $0.4830 = $259/year. With the federal 18.4¢ that's about $358 of fuel tax for the year.
Common use cases
- Seeing how much of your fuel spending goes to Illinois gas tax
- Comparing fuel-tax cost between states before relocating
- illinois is one of the few states that also charges its 6.25% general sales tax on gasoline, on top of the per-gallon excise
- chicago-metro counties levy a County Motor Fuel Tax, and Chicago and Cook County add home-rule fuel taxes on top
Limitations & assumptions
- The 18.4¢/gal federal gas tax is not included — combined with Illinois's state rate it's 66.7¢/gal.
- Local add-ons matter here: yes — County Motor Fuel Taxes in the Chicago metro (Cook, DuPage, Kane, Lake, McHenry, Will) plus Chicago and Cook County home-rule fuel taxes add several more cents.
- Rates change: The motor-fuel excise rose to 48.3¢/gal effective July 1, 2025 (a 2.82% CPI-based increase) through June 30, 2026.
- Treat this as a planning estimate — actual pump prices move with crude markets.
Frequently asked questions
What is the gas tax in Illinois?
How much gas tax do I pay per year in Illinois?
Is Illinois's gas tax fixed or does it change?
Are there local gas taxes in Illinois?
Where does Illinois's gas-tax money go?
Disclaimer: KalkWise calculators are provided for general informational and educational purposes only and do not constitute financial, investment, tax, or legal advice. Results are estimates based on the figures you enter and the assumptions described above. Actual outcomes will vary. Consult a qualified professional before making financial decisions.