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Last updated: May 2026 · Idaho IFTA rates current for Q1–Q4 2026
Idaho · 32.0¢/gal · Average Tax State

Idaho IFTA Calculator 2026 — Diesel Tax Rate & Filing

Idaho diesel tax rate is 32.0¢ per gallon for 2026. Calculate your quarterly IFTA fuel tax liability for Idaho routes and compare to neighboring states.

Calculate Your Idaho IFTA Tax

Idaho IFTA Rates & Trucking Overview 2026

Idaho's 32.0¢/gal diesel rate puts it in the middle of the Mountain West pack. Boise has grown into a significant regional distribution hub, with Amazon, Walmart, and other major retailers operating large fulfillment centers in the Treasure Valley. Agriculture — potatoes, dairy, wheat, and hops — generates substantial year-round outbound freight.

Major Idaho Trucking Routes

I-84 (Boise–Twin Falls–Utah/Oregon), I-86 (Pocatello–I-15 junction), I-15 (Idaho Falls–Montana), US-95 (Lewiston–Boise, north-south secondary), I-90 (Coeur d'Alene–Montana/Washington)

The Snake River Plain along I-84 is the primary freight corridor, connecting Boise to Salt Lake City (Utah, 31.9¢) and Portland (Oregon, 36.0¢). I-90 through Coeur d'Alene links Idaho to Spokane and the Pacific Northwest. Mountain passes on I-84 and US-12 require attention to weight limits and seasonal restrictions.

Idaho IFTA — Frequently Asked Questions

What is Idaho's IFTA diesel tax rate in 2026?
Idaho's diesel rate is 32.0¢/gal for 2026 — roughly mid-range nationally and nearly identical to neighboring Utah (31.9¢). Nevada at 27.8¢ and Wyoming at 24.0¢ offer meaningful savings for southern/eastern runs.
Who administers IFTA for Idaho-based carriers?
Idaho IFTA is administered by the Idaho Transportation Department. File quarterly at itd.idaho.gov. Idaho-based carriers receive IFTA credentials from ITD and must display current-year decals on each qualifying vehicle.
What are Idaho's biggest freight commodities?
Agriculture leads Idaho freight — potatoes (Idaho produces ~30% of US supply), dairy, wheat, barley, and hops. Retail distribution from Boise-area warehouses is the fastest-growing segment. Mining and lumber generate significant bulk commodity loads in northern Idaho.
Are there truck size/weight restrictions in Idaho?
Idaho allows longer combination vehicles (LCVs) on certain routes, making it popular with Rocky Mountain doubles and triples operations. I-84 and I-86 are primary LCV corridors. Check ITD permits for oversized loads on US-12, which runs through scenic gorges with tight clearances.
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Idaho Quick Reference

Idaho diesel tax 2026→32.0¢/gal
Fuel strategy→⚠️ Check neighbors
Utah 31.9 ≈→¢
Nevada→27.8¢ ✅
Oregon→36.0¢ ↑
Washington→49.4¢ ❌

Fueling tip: Utah at 31.9¢ and Idaho at 32.0¢ are nearly identical — no significant savings either direction. Nevada at 27.8¢ is better if routing south. Oregon at 36.0¢ means fuel before crossing west.

Need full IFTA across all 48 states? Use the IFTA Fuel Tax Calculator.

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