Typical commuter
12,000 mi · 25 MPG · 480 gal
$158.40
+ $88.80 federal
All states
Jan. 1 2026Rank #19
Jan. 1 2026Rank #19Idaho Gas Tax 2026
32¢/gal excise + 1¢/gal fees = 33¢/gal state (51.5¢/gal with federal).
By Sammy S. · Founder · AuthorUpdated for 2026
33¢/gal
State total
51.5¢/gal
Combined
$158.40
Annual state tax
#19
National rank
Idaho gasoline tax breakdown
Excise tax
32¢/gal
Other fees
1¢/gal
State total
33¢/gal
Combined w/ federal
51.5¢/gal
Idaho's 33¢/gal state total ranks #19 nationally and is below the 33.25¢/gal US average. Federal tax adds 18.5¢/gal everywhere.
Estimated annual gasoline tax in Idaho
State tax only (federal shown separately). Gallons = miles ÷ MPG.
Higher mileage
15,000 mi · 25 MPG · 600 gal
$198.00
+ $111.00 federal
30 MPG vehicle
12,000 mi · 30 MPG · 400 gal
$132.00
+ $74.00 federal
20 MPG vehicle
12,000 mi · 20 MPG · 600 gal
$198.00
+ $111.00 federal
Default headline: $158.40 state tax at 12,000 miles and 25 MPG (480 gallons).
Key takeaways — Idaho gas tax
- Idaho total state gasoline tax is 33¢/gal (32¢/gal excise + 1¢/gal other fees) in 2026.
- Combined with federal 18.5¢/gal, the tax component is about 51.5¢/gal per gallon.
- National rank #19 (#1 = highest). That is 0.25¢/gal below the 33.25¢/gal US average state tax.
- At 12,000 miles and 25 MPG, state tax is about $158.40 and combined federal+state about $247.20.
- Bordering jurisdictions range from 23.81¢/gal to 59.04¢/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.
Idaho vs neighboring states
Total state gasoline tax for jurisdictions that share a border with Idaho. Idaho is 33¢/gal (rank #19).
| State | State total | vs ID | Compare |
|---|---|---|---|
| Idaho | 33¢/gal | — | This page |
 Washington | 59.04¢/gal | +26.04¢/gal | vs ID |
 Oregon | 40¢/gal | +7¢/gal | vs ID |
 Utah | 38.55¢/gal | +5.55¢/gal | vs ID |
 Montana | 33.75¢/gal | +0.75¢/gal | vs ID |
 Wyoming | 24¢/gal | -9¢/gal | vs ID |
 Nevada | 23.81¢/gal | -9.19¢/gal | vs ID |
*Annual state tax at 12,000 miles and 25 MPG. Federal tax excluded from the delta column.
Idaho tax on a typical fill-up
Tax dollars already included in the pump price at 33¢/gal state + federal.
10-gallon fill-up
$3.30
state · $5.15 w/ federal
15-gallon fill-up
$4.95
state · $7.73 w/ federal
20-gallon fill-up
$6.60
state · $10.30 w/ federal
How to read this page
Idaho gas tax overview (2026)
Idaho charges a total statewide gasoline tax of 33¢/gal as of January 1, 2026, per Tax Foundation Table 22. That breaks down to 32¢/gal in excise and 1¢/gal in other per-gallon fees.
Add the federal 18.5¢/gal for a combined tax component of 51.5¢/gal. Wholesale crude, refining, and station margins still make up most of the retail price.
Rank #19 places Idaho 0.25¢/gal below the 33.25¢/gal average across all 51 jurisdictions in this dataset.
What drivers in Idaho pay over a year
Using 12,000 miles at 25 MPG (480 gallons), state gasoline tax alone is about $158.40. Federal tax on the same gallons is about $88.80.
A 15-gallon fill-up carries roughly $4.95 in state tax ($7.73 including federal)—before any local add-ons.
If you often cross into Washington, Oregon, Utah, compare those rates before assuming Idaho is always the cheapest fill.
Planning fuel costs in Idaho
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 Idaho gas tax page helps
Useful if…
- •Residents of Idaho estimating how much of each fill-up is tax.
- •Commuters weighing Idaho 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.
Idaho gas tax checklist
Quick steps before treating the statewide average as your exact pump tax.
- 1Confirm Idaho's 33¢/gal state total and rank #19.
- 2Add federal 18.5¢/gal for a 51.5¢/gal combined tax component.
- 3Estimate annual cost with your miles ÷ MPG × rate.
- 4Ask whether local fuel taxes apply at your usual stations.
- 5Compare Idaho 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
Wisconsin
Minnesota
Nebraska
Georgia
VermontCompare Idaho with another state
Compare any two states
State gasoline tax rates with annual driving-cost estimates.
Idaho gasoline tax FAQs
Idaho's total state gasoline tax is 33¢/gal in 2026: 32¢/gal excise plus 1¢/gal in other per-gallon fees.
51.5¢/gal per gallon (33¢/gal state + 18.5¢/gal federal).
At 12,000 miles and 25 MPG (480 gallons), state tax is about $158.40 and federal tax about $88.80, for $247.20 combined.
Idaho ranks #19 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. Idaho may use a different diesel excise or fee schedule than the gasoline total shown here.
Idaho's 33¢/gal is below 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 $4.95 in state tax and $7.73 including federal 18.5¢/gal—already in the pump price.
Nearby state totals: Washington 59.04¢/gal (+26.04¢/gal vs ID); Oregon 40¢/gal (+7¢/gal vs ID); Utah 38.55¢/gal (+5.55¢/gal vs ID); Montana 33.75¢/gal (+0.75¢/gal vs ID); Wyoming 24¢/gal (-9¢/gal vs ID); Nevada 23.81¢/gal (-9.19¢/gal vs ID). 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.