Washington Gas Tax Calculator

2026

Washington charges 60.17¢ a gallon in state tax on gasoline and 63.17¢ on diesel in 2026, on top of the federal 18.4¢ and 24.4¢: 78.57¢ and 87.57¢ a gallon in all. Estimate your fuel costs.

By Konstantin Iakovlev · Updated October 19, 2026 · Methodology

miles
MPG
$/gal
Trip Type

Fuel Needed

1.0 gal

Trip Cost

$4.33

Annual Cost

$1,125.80

Fuel Cost Breakdown

Total Distance30.0 miles
Fuel Needed1.00 gallons
One-Way Cost$4.33
Trip Cost$4.33
Weekly Cost$21.65
Monthly Cost$93.82
Annual Cost$1,125.80

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

Washington Gas Tax Overview

Washington’s state tax on gasoline is 60.17¢ a gallon and 63.17¢ on diesel, the rate in force since July 1, 2026. That is the 2nd-highest state gasoline tax of the 50 states and DC. A 2% inflation step is added each July 1 from 2026; diesel also rises 3¢ on July 1, 2027.

With the federal 18.4¢, a gallon of gasoline carries 78.57¢ of per-gallon tax, so a 15-gallon fill-up includes about $11.79 of fuel tax whatever the pump price. Washington's 0.3% petroleum products tax applies to the wholesale value of fuel; fuel subject to the state fuel tax is exempt from retail sales tax. Qualifying jurisdictions near the Canadian border can add a border-area fuel tax of up to 1¢ a gallon; there are no other local per-gallon fuel taxes.

Scheduled change: from July 1, 2027 the rate becomes 61.27¢ on gasoline and 67.27¢ on diesel.

Washington Fuel Taxes (2026)

State Gasoline Tax 60.17¢/gal
State Diesel Tax 63.17¢/gal
Federal Excise Tax 18.4¢ gasoline / 24.4¢ diesel
Total per Gallon 78.57¢ gasoline / 87.57¢ diesel
Sales and Other Taxes on Fuel Washington's 0.3% petroleum products tax applies to the wholesale value of fuel; fuel subject to the state fuel tax is exempt from retail sales tax.
How the State Rate Is Built Gasoline: 56.5¢ fuel tax + 3.548¢ hazardous substance tax + 0.119¢ in oil-spill taxes. Diesel: 59.5¢ special fuel tax + the same 3.667¢ in other taxes.
Next Change July 1, 2027: 61.27¢ gasoline / 67.27¢ diesel

Official Sources:

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