Q4 2026 IFTA diesel rate
California IFTA fuel tax rate, Q4 2026
CACalifornia · diesel$0.9790/gal
Unchanged from Q3 2026.
Checked 2026-10-14 against cdtfa.ca.gov, California's own published rate.
Calculate California for Q4 2026Free. No account.
What you owe California
IFTA apportions your fuel by miles. Divide total miles by total gallons for fleet MPG, turn your California miles into taxable gallons, subtract the tax-paid gallons you bought in California, and multiply by $0.9790.
Example: 1,000 miles in California at 6.5 MPG is 153.85 taxable gallons. With 100 tax-paid gallons bought there, 53.85 × $0.9790 = $52.72 owed to California.
This rate is for diesel, Q4 2026. You still file with your base jurisdiction; keep your trip records and receipts.