Gera Tools

Connecticut Gas Tax Calculator

See how much Connecticut gas tax you pay per fill-up and per year.

Calculates total fuel tax cost using Connecticut's per-gallon gasoline excise tax plus the federal excise tax, based on your tank size, fill-ups, or annual mileage and fuel economy, to show what you pay in gas taxes.

What is Connecticut's gas tax rate?

Connecticut levies a gasoline excise tax of about 25 cents per gallon. The state also imposes a petroleum products gross receipts tax on the wholesale price, which is built into the pump price even though it is not a flat per-gallon amount.

Connecticut’s gasoline excise tax is about 25 cents per gallon, layered on top of the federal 18.4-cent excise tax. There’s also a petroleum gross receipts tax baked into the wholesale price. This tool estimates the flat per-gallon tax you pay per fill-up and across a year of driving.

How it works

You can estimate by a single tank or by annual mileage. Both multiply gallons by the combined per-gallon tax:

combined tax/gal = CT excise + federal excise
per fill-up      = tank gallons × combined tax/gal
annual gallons   = annual miles ÷ miles per gallon
per year         = annual gallons × combined tax/gal

The flat excise taxes don’t move with the pump price. Connecticut’s separate petroleum gross receipts tax is a percentage of the wholesale cost, so it isn’t modeled as a fixed per-gallon number here.

Example and notes

Driving 12,000 miles a year at 30 mpg burns 12,000 ÷ 30 = 400 gallons. At a combined tax of 0.25 + 0.184 = 0.434 dollars per gallon, that’s 400 × 0.434 ≈ 174 dollars a year in flat fuel tax. A 14-gallon fill-up costs about 14 × 0.434 ≈ 6.08 dollars in tax. A more efficient car burns fewer gallons and pays less. Adjust the rates if Connecticut’s excise or the federal rate changes.