ID Diesel Rate: $0.320/gallon
Calculate your IFTA fuel tax for miles driven in Idaho. Current rate $0.320/gallon, effective 2026-04-01–2026-06-30. Add other states you traveled through for a complete quarterly return.
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Routes, regulations, and fuel strategy for Idaho — current rate $0.320/gallon
Idaho is primarily a corridor and agricultural origin state for western freight. I-84 is the main east-west artery, running from Oregon through Boise, Twin Falls, and Pocatello before turning north into Utah. I-86 provides a shortcut northeast from Pocatello toward I-15 in Montana. I-90 crosses the northern panhandle through Coeur d'Alene and Wallace, connecting Spokane to Missoula. The Snake River Plain through southern Idaho is some of the most productive agricultural land in the country — potatoes, dairy, wheat, barley, and onions all generate significant refrigerated and bulk freight volumes, especially in fall harvest season from August through October when agricultural shipping peaks dramatically.
Idaho's IFTA rate of $0.320 per gallon is moderate. Oregon at $0.380 (plus 2% surcharge) and Montana at $0.2775 flank it on the east-west corridor. Utah at $0.315 is similar. Wyoming at $0.240 is the cheapest nearby option for southbound drivers. Nevada at $0.285 is cheaper if your route takes you through the southwest corner of the state toward Jackpot.
Standard weight limits are 80,000 lbs on interstates. Idaho has seasonal weight restrictions on many secondary roads from February through April as frost leaves the ground — these can limit truck traffic to around 105,000 lbs on certain state highways during spring thaw, so check current postings with ITD before heading onto non-interstate routes in spring. Oversized loads need permits through the Idaho Transportation Department's online IRIS system.
Weigh stations on I-84 at Bliss (near Twin Falls) and at the Oregon border near Ontario are active. Mountain passes including Lookout Pass on I-90 and Snowville on I-84 near the Utah border see winter closures. For IFTA compliance, Idaho's Tax Commission handles IFTA cleanly — the potato harvest season creates a surge in mileage for carriers running refrigerated produce loads, so ensure your Q3 (July-September) and Q4 (October-December) returns accurately reflect the high Idaho mileage during these quarters.
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