Oregon diesel tax rate is 36.0¢ per gallon for 2026. Calculate your IFTA fuel tax for Oregon routes and compare neighboring state rates.
Oregon's diesel excise tax of 36.0¢/gal is above average, and Oregon is unique in also having a Weight-Mile Tax (WMT) that applies to commercial vehicles over 26,000 lbs — a per-mile charge separate from IFTA fuel tax. This makes Oregon one of the more expensive states for heavy trucking overall. Portland is the Pacific Northwest's primary freight hub and the 6th largest US port by cargo value.
I-5 (Portland–Salem–Eugene–Medford–California, primary north-south), I-84 (Portland–The Dalles–Ontario–Idaho, east-west Columbia River Gorge), I-205 (Portland east bypass), US-97 (Bend–Klamath Falls–California, inland north-south)
Idaho to the east (32.0¢) and Nevada to the south (27.8¢) are meaningfully cheaper for border fuel stops. California (62.5¢) to the south makes Oregon look favorable for southbound I-5 runs. Washington to the north (49.4¢) is more expensive. The Columbia River Gorge on I-84 has wind speed restrictions affecting high-profile vehicles — a common operational challenge for Oregon-based carriers.