Q4 2026 IFTA diesel rate
South Dakota IFTA fuel tax rate, Q4 2026
SDSouth Dakota · diesel$0.2800/gal
Unchanged from Q3 2026.
Checked 2026-10-14 against dor.sd.gov, South Dakota's own published rate.
Calculate South Dakota for Q4 2026Free. No account.
What you owe South Dakota
IFTA apportions your fuel by miles. Divide total miles by total gallons for fleet MPG, turn your South Dakota miles into taxable gallons, subtract the tax-paid gallons you bought in South Dakota, and multiply by $0.2800.
Example: 1,000 miles in South Dakota 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 Dakota.
This rate is for diesel, Q4 2026. You still file with your base jurisdiction; keep your trip records and receipts.