Q4 2026 IFTA diesel rate
Oklahoma IFTA fuel tax rate, Q4 2026
OKOklahoma · diesel$0.1900/gal
Unchanged from Q3 2026.
Checked 2026-10-14 against oklahoma.gov, Oklahoma's own published rate.
Calculate Oklahoma for Q4 2026Free. No account.
What you owe Oklahoma
IFTA apportions your fuel by miles. Divide total miles by total gallons for fleet MPG, turn your Oklahoma miles into taxable gallons, subtract the tax-paid gallons you bought in Oklahoma, and multiply by $0.1900.
Example: 1,000 miles in Oklahoma at 6.5 MPG is 153.85 taxable gallons. With 100 tax-paid gallons bought there, 53.85 × $0.1900 = $10.23 owed to Oklahoma.
This rate is for diesel, Q4 2026. You still file with your base jurisdiction; keep your trip records and receipts.