Washington gas tax
State fuel excise · tax year 2026 · federal tax excluded
On a 20-gallon fill
$11
Over 500 gallons
$283
Per gallon
56.5¢
state only
Rate rank
3
1 is the highest
What Washington charges at the pump
- Here is what Washington takes at the pump. Twenty gallons carries $11 of state fuel tax. Five hundred gallons over a year carries $283. It is built into the posted price, so nobody ever sees it itemized, and the state ranks 3 nationally on the rate.
- Washington charges more on diesel than on regular gasoline. The same twenty-gallon fill costs $12 in tax rather than $11 — a difference of $0.60 every time. Over a year of the same driving that gap is $298 against the gasoline figure.
- Washington adds a little more beyond the main fuel tax. Inspection and environmental charges come to $0.73 on a twenty-gallon fill. It is not large, and it is not optional either.
- State fuel excise in Washington amounts to $11 per twenty-gallon fill and $283 per five hundred gallons, with a rate ranking 3 nationally. ⚠️ The federal component is excluded. Unlike sales tax, fuel excise is embedded in the posted price rather than added at the register, which is why it is among the least visible taxes most households pay routinely.
- Diesel is taxed above gasoline in Washington: $12 per twenty gallons against $11, a differential of $0.60 per fill and $298 across five hundred gallons. ⚠️ The differential is deliberate policy rather than an accident of drafting — heavier vehicles impose disproportionate road wear, and a higher diesel rate is the standard instrument for recovering it.
- Beyond the principal excise, Washington levies separately-reported charges on motor fuel worth $0.73 per twenty gallons. ⚠️ Because states differ in whether such charges are consolidated into the headline rate or reported apart, cross-state rate tables — including the rank on this page — are not strictly comparable at the margin.
Your year of fuel tax
A $75,000 salary
| State fuel taxper gallon | 56.5¢ |
|---|---|
| Fuel tax, year | $353 |
| You must earn | $501 |
| Hours of work | 14 hr |
State excise only. Federal fuel tax and any local levy are not included.
Tax in a tank
A $75,000 salary
| State rate | 56.5¢ a gallon |
|---|---|
| Tank costs | $44.80 |
| Fifty tanks a year | $395.50 |
State excise only. The federal fuel tax and any local levy are on top of this.
Gasoline, diesel, and the charges reported separately
Per-gallon rates are shown as Washington publishes them, to a tenth of a cent. The money columns are what those rates come to on a 20-gallon fill and across 500 gallons. Federal tax is charged on top of all of it and is not included.
| Fuel | Per gallon | On a fill | Over a year |
|---|---|---|---|
| Gasoline | 56.5¢ | $11 | $283 |
| Diesel | 59.5¢ | $12 | $298 |
| Other state charges | 3.7¢ | $0.73 | — |
What this page cannot tell you
- ⚠️ Federal fuel tax is charged on top of all this and is not included above. It is the same everywhere in the country.
- The tank and the year here are round reference amounts, not a guess at your driving. Your own total scales directly with the gallons you actually buy in Washington.
- And some places add local fuel taxes of their own on top of the state's. Those are not counted here.
- ⚠️ Federal motor fuel excise applies in addition to every figure on this page and is deliberately excluded, being uniform nationally. Including it would raise each state's figure by the same amount and compress the differences this page exists to show.
- Quantities are reference points rather than estimates of consumption: liability is strictly proportional to gallons purchased, so any household's figure is this one scaled by its own volume. ⚠️ Fuel purchased outside Washington is taxed by the state where it is bought, which is why the figures describe purchases rather than mileage.
- Local option fuel taxes exist in a number of states and are excluded from these figures, which cover the state levy only. Where a county or city in Washington imposes its own charge, the true per-gallon burden at that address exceeds what this page reports.
Questions people ask
Why is there no tax line on my fuel receipt?
The tax is collected upstream and per gallon, not at the register. That is why the sign price is the final price, and why a cheaper week does not mean a smaller tax.
Is this a high-tax state for this?
Toward the top: 3 of 51. State-to-state variation on this levy is unusually wide.
Is diesel taxed the same as gasoline?
Different rate entirely — higher than gasoline here. The split is deliberate and rests on which vehicles do most damage to the road surface.
Why does motor fuel excise not appear as a separate charge?
Motor fuel excise is levied per gallon at the distributor or terminal, not at retail, so it is embedded in the pump price and not separately stated. Because it is volumetric rather than ad valorem, liability per gallon is invariant to the retail price and its real value erodes with inflation absent legislative change.
Where does this state sit in the national distribution?
This state ranks 3 of 51, placing it in the upper third. Wide interstate dispersion in per-unit excise creates measurable cross-border purchasing effects, which several revenue departments model explicitly when forecasting receipts.
How does the diesel rate relate to the gasoline rate here?
Diesel is taxed at a rate set independently of gasoline and is higher in this state. The differential is generally justified by road-wear attribution to heavy vehicles rather than by fuel characteristics, and several states index the two grades differently.