Q4 2026 IFTA diesel rate

South Carolina IFTA fuel tax rate, Q4 2026

SCSouth Carolina · diesel$0.2800/gal

Unchanged from Q3 2026.

Checked 2026-10-14 against dor.sc.gov, South Carolina's own published rate.

Calculate South Carolina for Q4 2026Free. No account.

What you owe South Carolina

IFTA apportions your fuel by miles. Divide total miles by total gallons for fleet MPG, turn your South Carolina miles into taxable gallons, subtract the tax-paid gallons you bought in South Carolina, and multiply by $0.2800.

Example: 1,000 miles in South Carolina at 6.5 MPG is 153.85 taxable gallons. With 100 tax-paid gallons bought there, 53.85 × $0.2800 = $15.08 owed to South Carolina.

This rate is for diesel, Q4 2026. You still file with your base jurisdiction; keep your trip records and receipts.