What Changes on Your Oregon Weight-Mile Tax Report on July 1, 2027?
Table Of Contents
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Introduction
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Why the Oregon Weight-Mile Tax Report Is Changing
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From 85 Tax Rates to 10
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Your Tax Weight Will Match Your Cab Card
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The One-Time Weight Amendment in Spring 2027
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Temporary Weight Increases
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Flat Fee Changes for Log, Dump, and Wood Chip Haulers
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Reporting Dates During the Switch
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How to Prepare Now
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Why Many Trucking Companies Choose Our Service
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FAQ
Introduction
For years, the Oregon Weight-Mile Tax Report has been one of the more complicated filings in trucking. Carriers have had to track declared weights, axle counts, and different configurations for every vehicle, then match each mile to the right rate.
That changes on July 1, 2027. Under House Bill 3991, the Oregon Department of Transportation (ODOT) is simplifying the weight-mile tax. Due dates stay the same, but how you figure the tax, which weight you use, and what you track all change. Here is what to expect and how to get ready.
Why the Oregon Weight-Mile Tax Report Is Changing
HB 3991 was passed in Oregon's 2025 special session. ODOT reports that several of the fee and tax increases in the bill were repealed in May 2026. However, the changes that affect motor carriers, including weight-mile tax simplification and other rate changes, were not repealed.
In other words, the new reporting structure is still on track for July 1, 2027.
From 85 Tax Rates to 10
The biggest change is the rate table itself. ODOT is reducing the weight-mile tax from 85 rates to 10 rates. All vehicles over 26,000 pounds will use one table, ODOT Form 9928-2027, regardless of fuel type.
The new table uses nine weight groups of 6,000 pounds each between 26,001 and 80,000 pounds, plus one group for 80,001 to 105,500 pounds. Some examples from ODOT's 2027 table:
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26,001 to 32,000 lbs: 7.64 cents per mile
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50,001 to 56,000 lbs: 13.25 cents per mile
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74,001 to 80,000 lbs: 25.12 cents per mile
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80,001 to 105,500 lbs: 26.31 cents per mile
ODOT says carriers will no longer need to track changes in configuration, number of axles, or operations above 80,000 pounds. Heavy haulers who used the old Table B axle rates will report on the same single table as everyone else.
Your Tax Weight Will Match Your Cab Card
Under the current system, a truck can carry several declared weights for different configurations. Starting July 1, 2027, ODOT states that tax weight will be the same as registration weight, as shown on the vehicle's cab card.
One vehicle, one weight, one rate. ODOT's 2027 table also notes that if a truck returns empty, it uses the same weight and rate as when loaded. You no longer report a lower empty weight.
This makes the report simpler, but it also means your registration weight matters more. Register a truck that is too heavy, and you pay a higher rate on every Oregon mile. Register it too lightly, and it cannot legally haul heavier loads.
The One-Time Weight Amendment in Spring 2027
To move every account to the new system, ODOT plans a mandatory one-time amendment (MOTA) of enrolled weights in spring 2027. This is when carriers will set the single weight each vehicle uses under the new structure.
Watch for notices from ODOT's Commerce and Compliance Division and review each truck's weight before you submit. Choose based on the heaviest loads that truck actually hauls.
Temporary Weight Increases
What about a truck that usually runs light but takes an occasional heavy load? HB 3991 adds a temporary weight increase. ODOT says it costs $5 per vehicle, is valid for 10 days, and can be purchased as many times as needed.
ODOT also notes that the carrier then pays at the higher rate for the whole reporting period, so plan heavy loads with that in mind.
Flat Fee Changes for Log, Dump, and Wood Chip Haulers
Some carriers pay a monthly flat fee instead of reporting by the mile. Three changes take effect July 1, 2027:
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Wood chips: the flat fee is eliminated. Chip haulers will report by the mile.
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Logs, poles, piling, and peeler cores: the flat fee decreases.
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Sand, gravel, and dump trucks: the flat fee increases.
ODOT's 2027 flat fee form (Form 9927-2027) shows an 80,000 lb log truck at $700.00 per month and an 80,000 lb dump truck at $1,132.00 per month. Flat fee reports are still due by the 10th of the following month, and a report is required for each elected commodity even with no operations.
Reporting Dates During the Switch
ODOT confirms that due dates do not change. For monthly filers:
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The June 2027 report uses the current rates and is due July 31, 2027.
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The July 2027 report is the first one under the new structure and is due August 31, 2027.
Keep June and July mileage separate in your records so each month is reported under the right rules.
Other changes in HB 3991, including a fuel tax for heavy trucks and IFTA participation, are scheduled for July 1, 2029, not 2027.
How to Prepare Now
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Review Every Truck's Weight. Compare each vehicle's cab card weight with the loads it really carries.
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Watch for the Spring 2027 Amendment. Respond to ODOT's MOTA request on time.
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Update Your Software. Make sure your mileage tracking and fleet software can switch to the new rates on July 1, 2027.
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Check Your Flat Fee Election. Wood chip haulers should plan to report by the mile.
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Keep Clean Records. ODOT still requires mileage records to be kept for three years.
Why Many Trucking Companies Choose Our Service
Big rule changes are where mistakes happen. Oregon Trucking Online helps carriers stay on top of every Oregon Weight-Mile Tax Report, both before and after the July 1, 2027, switch. We help you understand the new rates, track due dates, and keep your account in good standing.
We provide support 24/7 and also work weekends and holidays. Carriers remain responsible for accurate mileage records and for following ODOT's current rules.
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FAQ
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When does the new Oregon Weight-Mile Tax Report structure start?
July 1, 2027. The July 2027 report, due August 31, 2027, is the first one under the new rules.
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Was HB 3991 repealed?
ODOT says some fee and tax increases were repealed in May 2026, but weight-mile tax simplification was not.
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Will I still report axles and configurations?
No. ODOT says carriers will no longer track configuration, number of axles, or operations above 80,000 pounds.
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Which weight do I use after July 1, 2027?
Your tax weight will be the registration weight on your cab card.
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Do the due dates change?
No. Due dates stay the same.
For more information, visit the Oregon Department of Transportation.