Oregon’s monthly mileage tax report is the weight-mile tax filing that for-hire and private motor carriers running vehicles or combinations over 26,000 pounds must submit to the Motor Carrier Transportation Division each month. The report and payment must be postmarked by the last day of the month covering operations for the prior calendar month, and a missed deadline triggers a 10 percent late payment charge on the tax owed.1Oregon Department of Transportation. File a Tax Report
If you drive a passenger vehicle and are looking for information about the voluntary OReGO road usage charge, that is a separate program with its own private account manager and invoice system; the monthly mileage tax report described here applies only to heavy commercial vehicles.
Who Must File
The weight-mile tax applies to every for-hire carrier and private carrier operating a vehicle or combination exceeding 26,000 pounds on Oregon highways. There is no opt-out.2Oregon State Legislature. Oregon Code 825.474 – Motor Carrier Tax for Use of Highways Carriers subject to the tax must keep daily records of all vehicles used during the month and certify monthly summaries showing total miles traveled in Oregon and fuel tax paid.3Oregon State Legislature. Oregon Code 825 – Motor Carriers
Certain operations, including farm-exempt trips, school transportation, and nonprofit operations, fall under different rules or exemptions depending on the circumstances.
When the Report Is Due
The monthly mileage tax report and payment must be postmarked by the last day of the month, covering operations for the preceding calendar month.1Oregon Department of Transportation. File a Tax Report A report for January operations is due by the last day of February. If the deadline falls on a weekend or holiday, it moves to the next business day.
Paper filings are judged by postmark date, so mailing on the deadline is still timely. Electronic filings are judged by the date they are submitted and accepted.
How the Tax Is Calculated
The tax is calculated by multiplying total Oregon miles by the rate for your vehicle’s declared combined weight group, using the rate tables under ORS 825.476.2Oregon State Legislature. Oregon Code 825.474 – Motor Carrier Tax for Use of Highways Rates climb steeply with weight. A truck in the 78,001-to-80,000-pound weight group pays 23.7 cents per mile. Lighter commercial vehicles pay considerably less.
After calculating the weight-mile tax owed, carriers subtract any Oregon fuel tax already paid during that month to determine the net balance due with the report.
How to File
Carriers have three ways to submit the monthly report.
- Oregon Truck Tracking Online (OTTO). An automated system where on-board GPS or mileage tracking devices record taxable miles, and authorized vendors electronically file weight-mile tax reports and pay by direct payment. This option requires meeting ODOT’s technical specifications and registering for an OTTO account.4Oregon Department of Transportation. Oregon Truck Tracking Online OTTO
- Oregon Trucking Online. A web portal where carriers can manage accounts and request weight-mile report forms for electronic filing.
- Paper filing. Mail completed forms to the Motor Carrier Transportation Division. Mailed reports must be postmarked by the due date to be considered timely.1Oregon Department of Transportation. File a Tax Report
Large fleets and third-party vendors that file for multiple carriers generally use OTTO because it automates what would otherwise be a tedious monthly process. Smaller independent operators often use Oregon Trucking Online or paper forms.
Penalties for Late or Missing Reports
Miss the deadline and the late payment charge is 10 percent of the tax owed, calculated on top of the unpaid tax.1Oregon Department of Transportation. File a Tax Report A carrier owing $2,000 for the month would owe an additional $200 immediately.
It gets worse from there. If a carrier fails to pay within 30 days after receiving a deficiency notice, an additional 10 percent penalty is assessed on the outstanding balance, and ODOT cannot waive or reduce that second penalty. Carriers who persistently fail to file legible reports or maintain required records risk suspension or cancellation of their operating authority, which effectively shuts down their ability to operate in Oregon.5Oregon Secretary of State. Oregon Administrative Rules Chapter 740 Division 55
ODOT does have discretion to waive or reduce the initial 10 percent late payment charge and certain audit penalties. Requesting a waiver does not pause the obligation. The tax remains due while the waiver request is under review.
Records You Must Keep
Carriers must maintain daily records of every vehicle operated during the month, using forms prescribed by ODOT. The certified monthly summaries filed with the state must show total miles traveled in Oregon during the preceding month, fuel tax paid, and any other information the department requires.3Oregon State Legislature. Oregon Code 825 – Motor Carriers
Daily logs must remain on file at the carrier’s office until ODOT grants written permission to destroy them. In practice, keeping several years of records is wise because auditors can review historical filings and the state uses those records to verify what you reported.
Filing Changes to Your Account
Weight-mile reporting is tied to the declared combined weight of your vehicle, so changes to your fleet, your declared weights, or your operating authority need to be reflected in your account before they show up on a monthly report. Carriers who shut down operations should notify the Motor Carrier Transportation Division rather than simply stop filing, because an account that stays open without reports can accumulate deficiency notices and penalties on an assumed tax base.
If you are new to Oregon weight-mile reporting, the Motor Carrier Transportation Division is the office to contact for setting up your account, obtaining the correct report forms, and confirming the rate table that applies to your declared weight group.