Connecticut Gas Tax Calculator

2026

Connecticut charges 25¢ a gallon in state tax on gasoline and 49.9¢ on diesel in 2026, on top of the federal 18.4¢ and 24.4¢: 43.4¢ and 74.3¢ 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.

Connecticut Gas Tax Overview

Connecticut’s state tax on gasoline is 25¢ a gallon and 49.9¢ on diesel, the rate in force since July 1, 2026. That is the 37th-highest state gasoline tax of the 50 states and DC. Gasoline fixed at 25¢ since 2000; diesel reset every July 1 by a state formula.

With the federal 18.4¢, a gallon of gasoline carries 43.4¢ of per-gallon tax, so a 15-gallon fill-up includes about $6.51 of fuel tax whatever the pump price. Connecticut's petroleum products gross earnings tax applies to the first sale of fuel in the state; it is built into the wholesale price rather than added at the pump.

Scheduled change: from July 1, 2027 the rate becomes 25¢ on gasoline.

Connecticut Fuel Taxes (2026)

State Gasoline Tax 25¢/gal
State Diesel Tax 49.9¢/gal
Federal Excise Tax 18.4¢ gasoline / 24.4¢ diesel
Total per Gallon 43.4¢ gasoline / 74.3¢ diesel
Sales and Other Taxes on Fuel Connecticut's petroleum products gross earnings tax applies to the first sale of fuel in the state; it is built into the wholesale price rather than added at the pump.
How the State Rate Is Built A single 25¢ tax on gasoline and a 49.9¢ tax on diesel.
Next Change July 1, 2027: 25¢ gasoline

Official Sources:

Other Connecticut Calculators