IFTA Tax Rates in Oregon (2026)
Oregon is the odd one out: heavy trucks pay no per-gallon IFTA fuel tax at all. Instead the state bills by the mile — and the weight-mile tax often costs more than the highest fuel tax in the country. Here is how Oregon really works in 2026, and what changes in 2027.
By the HaulMath editorial team · Updated $1
Key numbers at a glance
| Oregon measure (2026) | Rate | Who pays |
|---|---|---|
| IFTA per-gallon rate, heavy trucks | none in matrix | Weight-mile tax applies instead |
| Use fuel tax, gasoline/diesel | $0.40 per gallon | Vehicles below the heavy-truck threshold |
| Weight-mile tax (typical range) | $0.0764–$0.2411 per mile | Heavy combinations, by weight and axles |
| Weight-mile example, 5 axles at ~81,000 lbs | ≈ $0.2115 per mile | Industry-reported example |
IFTA tax rates in Oregon
Oregon reports no per-gallon IFTA fuel tax rate for heavy trucks — the Q4 2026 IFTA Inc. rate matrix simply lists no Oregon fuel rate, because vehicles above the heavy-truck threshold settle with Oregon through the weight-mile tax (WMT) instead. Lighter vehicles do pay a per-gallon tax: Oregon's use fuel tax is $0.40 per gallon per ODOT's current fuel tax rates page, which matches the Tax Foundation's July 2026 figure of $0.4000. Everything below is as of Q4 2026 — confirm the current official IFTA matrix and ODOT rate tables before filing.
The weight-mile tax is the number that matters to an 80,000-pound combination. Reported 2026 WMT rates run from roughly $0.0764 to $0.2411 per mile depending on declared weight and axle count, filed with ODOT — and per ODOT's interstate operations page, carriers with Oregon IFTA accounts must still file the weight-mile report for Oregon miles on top of their fuels tax reporting (oregon.gov).
| Oregon measure (2026) | Rate | Who pays |
|---|---|---|
| IFTA per-gallon rate, heavy trucks | none in matrix | Weight-mile tax applies instead |
| Use fuel tax, gasoline/diesel | $0.40 per gallon | Vehicles below the heavy-truck threshold |
| Weight-mile tax (typical range) | $0.0764–$0.2411 per mile | Heavy combinations, by weight and axles |
| Weight-mile example, 5 axles at ~81,000 lbs | ≈ $0.2115 per mile | Industry-reported example |
| Federal excise (not part of IFTA) | 0.1840 gas / 0.2440 diesel | Paid at the pump everywhere |
Put that example in fuel-tax terms: at $0.2115 per mile and 6.5 MPG, a 5-axle rig at 81,000 pounds pays the equivalent of roughly $1.37 per gallon — nearly double Pennsylvania's 74.1-cent diesel rate, the highest per-gallon fuel tax in the nation. Oregon is not a low-tax state for trucks; it is a differently-taxed state.
How Oregon IFTA affects your filings
On the IFTA return itself, Oregon is mostly a distance line: you record Oregon miles, but there is no per-gallon Oregon tax to settle through the quarterly return, and Oregon diesel receipts generate no state fuel tax credit the way they would in a 40-cent state. The real Oregon liability arrives through the weight-mile account — separate filings, separate deadlines, and per-mile rates that reward smart configuration (more axles at the same weight can cut the rate sharply; industry examples show 9 axles at 81,000 pounds billed near $0.162 per mile versus $0.2115 for 5 axles).
For fuel planning, Oregon inverts the usual logic. Everywhere else you arbitrage per-gallon rates; in Oregon you arbitrage miles. Cross the state on I-84 or I-5 and the weight-meter runs the whole way, so the questions that matter are routing (shortest Oregon miles), configuration (axle count), and whether a load's rate covers a WMT cost that can exceed $0.20 per mile. Feed your other states through the IFTA calculator, then add Oregon as a per-mile line item in your cost per mile math rather than a fuel-tax line.
The rules are also about to move. ODOT announced in October 2026 that the weight-mile structure will be simplified for 2027 — collapsing 85 rate categories down to 10 and tying tax weight to registration weight — and industry reporting during 2026 indicated heavy trucks will begin paying a fuels tax alongside a reduced weight-mile tax as Oregon becomes a full IFTA participant. If Oregon is a regular lane, watch ODOT bulletins through the transition, keep your weight-mile filings clean, and make sure your fuel surcharge language covers per-mile road taxes, not just fuel. Every other state's current rate is on the IFTA rates by state hub.
FAQ
What is Oregon's IFTA tax rate on diesel?
Heavy trucks pay no per-gallon Oregon IFTA rate — the Q4 2026 matrix lists none because heavy vehicles pay the weight-mile tax. Lighter vehicles pay the 40-cent use fuel tax.
What is the Oregon weight-mile tax?
A per-mile charge on heavy vehicles by gross weight and axle count, filed with ODOT. Reported 2026 rates run roughly $0.0764–$0.2411 per mile, filed in addition to IFTA reporting.
How should I budget Oregon miles if there is no fuel tax?
Convert WMT to a per-gallon equivalent: at about $0.17 per mile and 6.5 MPG, Oregon costs roughly $1.10 per gallon burned. Treat it as a per-mile line item in cost per mile.
Is Oregon changing its fuel tax system?
Yes — ODOT is cutting the weight-mile table from 85 rates to 10 in 2027, and heavy trucks are expected to pay a fuels tax alongside a reduced WMT as Oregon joins IFTA fully.
Do I still file IFTA if my base state is Oregon?
Oregon-based interstate carriers still handle IFTA for other jurisdictions and file weight-mile reports for Oregon miles. Confirm account requirements with ODOT carrier services.