Typical commuter
12,000 mi · 25 MPG · 480 gal
$318.72
+ $88.80 federal
All states
Jan. 1 2026Rank #2
Jan. 1 2026Rank #2Illinois Gas Tax 2026
48.3¢/gal excise + 18.1¢/gal fees = 66.4¢/gal state (84.9¢/gal with federal).
By Sammy S. · Founder · AuthorUpdated for 2026
66.4¢/gal
State total
84.9¢/gal
Combined
$318.72
Annual state tax
#2
National rank
Illinois gasoline tax breakdown
Excise tax
48.3¢/gal
Other fees
18.1¢/gal
State total
66.4¢/gal
Combined w/ federal
84.9¢/gal
Illinois's 66.4¢/gal state total ranks #2 nationally and exceeds the 33.25¢/gal US average. Federal tax adds 18.5¢/gal everywhere.
Estimated annual gasoline tax in Illinois
State tax only (federal shown separately). Gallons = miles ÷ MPG.
Higher mileage
15,000 mi · 25 MPG · 600 gal
$398.40
+ $111.00 federal
30 MPG vehicle
12,000 mi · 30 MPG · 400 gal
$265.60
+ $74.00 federal
20 MPG vehicle
12,000 mi · 20 MPG · 600 gal
$398.40
+ $111.00 federal
Default headline: $318.72 state tax at 12,000 miles and 25 MPG (480 gallons).
Key takeaways — Illinois gas tax
- Illinois total state gasoline tax is 66.4¢/gal (48.3¢/gal excise + 18.1¢/gal other fees) in 2026.
- Combined with federal 18.5¢/gal, the tax component is about 84.9¢/gal per gallon.
- National rank #2 (#1 = highest). That is 33.15¢/gal above the 33.25¢/gal US average state tax.
- At 12,000 miles and 25 MPG, state tax is about $318.72 and combined federal+state about $407.52.
- Bordering jurisdictions range from 26.4¢/gal to 52.4¢/gal in state tax.
- Local fuel taxes and (in CA/OR/WA) LCFS or cap-and-trade costs may raise what you actually pay at the pump.
Illinois vs neighboring states
Total state gasoline tax for jurisdictions that share a border with Illinois. Illinois is 66.4¢/gal (rank #2).
| State | State total | vs IL | Compare |
|---|---|---|---|
| Illinois | 66.4¢/gal | — | This page |
 Indiana | 52.4¢/gal | -14¢/gal | vs IL |
 Wisconsin | 32.9¢/gal | -33.5¢/gal | vs IL |
 Iowa | 30¢/gal | -36.4¢/gal | vs IL |
 Missouri | 29.99¢/gal | -36.41¢/gal | vs IL |
 Kentucky | 26.4¢/gal | -40¢/gal | vs IL |
*Annual state tax at 12,000 miles and 25 MPG. Federal tax excluded from the delta column.
Illinois tax on a typical fill-up
Tax dollars already included in the pump price at 66.4¢/gal state + federal.
10-gallon fill-up
$6.64
state · $8.49 w/ federal
15-gallon fill-up
$9.96
state · $12.74 w/ federal
20-gallon fill-up
$13.28
state · $16.98 w/ federal
How to read this page
Illinois gas tax overview (2026)
Illinois charges a total statewide gasoline tax of 66.4¢/gal as of January 1, 2026, per Tax Foundation Table 22. That breaks down to 48.3¢/gal in excise and 18.1¢/gal in other per-gallon fees.
Add the federal 18.5¢/gal for a combined tax component of 84.9¢/gal. Wholesale crude, refining, and station margins still make up most of the retail price.
Rank #2 places Illinois 33.15¢/gal above the 33.25¢/gal average across all 51 jurisdictions in this dataset.
What drivers in Illinois pay over a year
Using 12,000 miles at 25 MPG (480 gallons), state gasoline tax alone is about $318.72. Federal tax on the same gallons is about $88.80.
A 15-gallon fill-up carries roughly $9.96 in state tax ($12.74 including federal)—before any local add-ons.
If you often cross into Indiana, Wisconsin, Iowa, compare those rates before assuming Illinois is always the cheapest fill.
Planning fuel costs in Illinois
Track miles and MPG for a realistic gallons estimate; tax scales directly with gallons purchased.
Diesel, aviation gasoline, and dyed fuel follow different federal and often different state schedules.
For tax-deductible business miles, use the IRS standard mileage rate or actual expenses—gas tax is already embedded in fuel cost and is not a separate personal income-tax line.
Who this Illinois gas tax page helps
Useful if…
- •Residents of Illinois estimating how much of each fill-up is tax.
- •Commuters weighing Illinois against a neighboring state’s pump taxes.
- •Small fleets budgeting annual fuel tax at known mileage.
- •Movers comparing offer packages that include a car commute.
Use official tools if…
- •You need an official refund, bonded fuel, or IFTA filing.
- •Your city adds a local fuel tax not in the statewide table.
- •You primarily buy diesel or alternative fuels.
- •You need a live retail price forecast rather than statutory rates.
Illinois gas tax checklist
Quick steps before treating the statewide average as your exact pump tax.
- 1Confirm Illinois's 66.4¢/gal state total and rank #2.
- 2Add federal 18.5¢/gal for a 84.9¢/gal combined tax component.
- 3Estimate annual cost with your miles ÷ MPG × rate.
- 4Ask whether local fuel taxes apply at your usual stations.
- 5Compare Illinois with a peer or neighbor before relocating for fuel savings alone.
- 6Recheck rates after mid-year reindexes if your state adjusts for inflation.
States with similar gasoline tax rates
| State | State total | Rank | Annual tax |
|---|---|---|---|
 California | 70.92¢/gal | #1 | $340.42 |
 Washington | 59.04¢/gal | #3 | $283.39 |
 Pennsylvania | 58.7¢/gal | #4 | $281.76 |
 Michigan | 53.4¢/gal | #5 | $256.32 |
| Indiana | 52.4¢/gal | #6 | $251.52 |
 New Jersey | 49.15¢/gal | #7 | $235.92 |
Compare Illinois with another state
Compare any two states
State gasoline tax rates with annual driving-cost estimates.
Illinois gasoline tax FAQs
Illinois's total state gasoline tax is 66.4¢/gal in 2026: 48.3¢/gal excise plus 18.1¢/gal in other per-gallon fees.
84.9¢/gal per gallon (66.4¢/gal state + 18.5¢/gal federal).
At 12,000 miles and 25 MPG (480 gallons), state tax is about $318.72 and federal tax about $88.80, for $407.52 combined.
Illinois ranks #2 by total state gasoline tax among the 50 states, where #1 is the highest rate. Equal totals may share a rank or receive consecutive ranks in the Tax Foundation table.
This table excludes county and municipal fuel taxes. Some cities or counties add separate per-gallon levies not reflected in the statewide total.
Federal diesel tax is 24.5¢/gal. Illinois may use a different diesel excise or fee schedule than the gasoline total shown here.
Illinois's 66.4¢/gal is above the 33.25¢/gal average across all jurisdictions in this dataset.
Rates are statewide totals as of January 1, 2026 from Tax Foundation Table 22. Local fuel taxes, diesel-specific schedules, and implied environmental program costs (notably in CA, OR, and WA) may not be fully captured.
About $9.96 in state tax and $12.74 including federal 18.5¢/gal—already in the pump price.
Nearby state totals: Indiana 52.4¢/gal (-14¢/gal vs IL); Wisconsin 32.9¢/gal (-33.5¢/gal vs IL); Iowa 30¢/gal (-36.4¢/gal vs IL); Missouri 29.99¢/gal (-36.41¢/gal vs IL); Kentucky 26.4¢/gal (-40¢/gal vs IL). Open a compare page for annual dollar gaps.
Many states periodically adjust excise rates; this page reflects Tax Foundation’s January 1, 2026 snapshot. Confirm the current statute or revenue department notice for the latest cents-per-gallon figure.
Personal commuting fuel is generally not deductible. Business or self-employed drivers usually claim the standard mileage rate or actual fuel expenses (which already include gas tax), not a separate state gas-tax credit.