South Carolina Gas Tax Calculator

2026

South Carolina charges 28.75¢ a gallon in state tax on gasoline and 28.75¢ on diesel in 2026, on top of the federal 18.4¢ and 24.4¢: 47.15¢ and 53.15¢ 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.

South Carolina Gas Tax Overview

South Carolina’s state tax on gasoline is 28.75¢ a gallon and 28.75¢ on diesel, the rate in force since July 1, 2022. That is the 31st-highest state gasoline tax of the 50 states and DC. No automatic adjustment; the last scheduled 2¢ step took effect July 1, 2022.

With the federal 18.4¢, a gallon of gasoline carries 47.15¢ of per-gallon tax, so a 15-gallon fill-up includes about $7.07 of fuel tax whatever the pump price.

South Carolina Fuel Taxes (2026)

State Gasoline Tax 28.75¢/gal
State Diesel Tax 28.75¢/gal
Federal Excise Tax 18.4¢ gasoline / 24.4¢ diesel
Total per Gallon 47.15¢ gasoline / 53.15¢ diesel
How the State Rate Is Built Gasoline and diesel: 28¢ motor fuel user fee + 0.25¢ inspection fee + 0.5¢ environmental impact fee.

Official Sources:

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