Oregon Weight-Mile Tax: what it is, who pays, and how to file
By TruePermitReviewed by the TruePermit compliance teamUpdated
The Oregon Weight-Mile Tax is a per-mile tax that commercial vehicles over 26,000 pounds pay for operating on Oregon's public roads. Instead of paying fuel tax at the pump, carriers report the miles they drive in Oregon and pay a rate set by the truck's declared weight — heavier trucks pay a higher rate per mile.
What is the Oregon Weight-Mile Tax?
The Oregon Weight-Mile Tax is administered by the Oregon Department of Transportation's Commerce and Compliance Division. It applies to most commercial vehicles with a registered or combined weight over 26,000 pounds operating on Oregon public roads. Oregon is unusual: it does not charge a diesel fuel tax on vehicles subject to the weight-mile tax, so heavy carriers pay by the mile instead of at the pump. Vehicles over 80,000 pounds use a separate axle-and-weight rate table. Carriers must open a weight-mile tax account, keep mileage records for every vehicle, and file a report for each period — even one showing zero Oregon miles. Reports are generally filed monthly, with a quarterly option for lower-mileage operations, and the records behind them are subject to audit.
Who has to pay the Oregon Weight-Mile Tax?
Any carrier operating a vehicle over 26,000 pounds combined weight on Oregon public roads owes the tax — whether the carrier is based in Oregon or just passing through. Both interstate and intrastate operations are covered. A limited set of vehicles is exempt or taxed differently (for example, certain farm vehicles and some government operations), and the heaviest configurations move to the axle-weight rate schedule. Confirm your specific situation with ODOT before assuming an exemption applies.
How is the Oregon Weight-Mile Tax calculated?
The tax equals the taxable miles you drive in Oregon multiplied by the per-mile rate for your declared weight. The rate rises in steps as declared weight increases, and vehicles over 80,000 pounds use the separate axle-weight (RUAF) table rather than the standard schedule. Because the published rate tables change, this guide does not quote a specific cents-per-mile figure — pull the current rate for your weight directly from ODOT's tables and apply it to your Oregon miles for the period.
How and when do you file?
Most carriers file a weight-mile tax report monthly, due at the end of the following month; low-mileage operations may qualify to file quarterly or under a flat-fee/annual arrangement. You report Oregon miles by vehicle, calculate the tax from the rate table, and pay ODOT. Keep your mileage source records — trip reports, GPS/IFTA mileage, odometer logs — because the weight-mile tax is audited and missing records lead to assessments.
How does it interact with IFTA?
Oregon participates in IFTA, but because it taxes heavy vehicles by the mile rather than on fuel, you still trackyour Oregon miles for IFTA reporting yet effectively pay no Oregon fuel tax on vehicles subject to the weight-mile tax. In practice you report Oregon miles in both places: as taxable miles for the weight-mile tax, and as Oregon distance on your IFTA return where Oregon's fuel-tax treatment is handled separately. Getting this split right is a common audit flashpoint.
What happens if you don't pay?
Late or unfiled weight-mile tax reports draw penalties and interest, and continued non-compliance can lead to suspension of your Oregon operating authority and registration. Because Oregon audits weight-mile tax accounts, underreported miles surface later as assessments plus penalties — quarters or years after the fact.
How Oregon compares to other state mileage taxes
| State | Program | Applies over | Filing |
|---|---|---|---|
| OregonThis guide | Weight-Mile Tax | Over 26,000 lbs | Monthly (quarterly option) |
| New York | Highway Use Tax | Over 18,000 lbs gross weight | Quarterly |
| Kentucky | Weight Distance Tax | 60,000 lbs and over | Quarterly |
| New Mexico | Weight Distance Tax | Over 26,000 lbs | Quarterly |
| Connecticut | Highway Use Fee | 26,000 lbs and over (Class 8–13) | Monthly |
TruePermit does the Oregon weight-mile math for you
Pro reconciles your Oregon miles against your odometers and computes the weight-mile tax on the current rate table — alongside NY HUT, KYU, NM WDT, and CT HUF — so you file numbers you can stand behind. Free for one truck to start.
Start freeThis guide is general information for compliance planning — not legal or tax advice. Rates and rules change; verify against ODOT before filing.