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Last updated: May 2026 · Calculation assumptions shown below
2026 IFTA Rates

IFTA Fuel Tax Calculator 2026 — All 48 State Rates

IFTA quarterly filings are due in 2026. Calculate your exact fuel tax liability across all 48 IFTA jurisdictions using current 2026 state tax rates.

This page targets 2026-specific data. For the full interactive calculator, use the IFTA Calculator.

IFTA in 2026 — What Changed

Several states updated their diesel fuel tax rates for 2026. Key changes affecting high-volume routes include California (68.0 cents/gal), Pennsylvania (74.1 cents/gal), and Illinois (59.6 cents/gal) — all among the highest in the country. States with lower rates like Wyoming (23.0 cents/gal) and New Mexico (22.9 cents/gal) remain attractive for fuel-stop planning.

IFTA quarterly filing deadlines for 2026: Q1 due April 30, Q2 due July 31, Q3 due October 31, Q4 due January 31, 2027. Late filing penalties begin at $50 or 10% of the net tax due, whichever is greater.

How IFTA Works in 2026

IFTA calculates your fuel tax liability based on where you drove versus where you bought fuel. If you drove 30% of your miles in California but only bought 10% of your fuel there, you owe California taxes on the difference. The calculator handles this math automatically for all 48 jurisdictions.

Frequently Asked Questions — 2026

When are IFTA reports due in 2026?
2026 IFTA quarterly deadlines: Q1 (Jan-Mar) due April 30, Q2 (Apr-Jun) due July 31, Q3 (Jul-Sep) due October 31, Q4 (Oct-Dec) due January 31, 2027.
Which states have the highest diesel tax in 2026?
The highest diesel fuel tax states in 2026 include Pennsylvania (74.1 cents/gal), California (68.0 cents/gal), Washington (67.8 cents/gal), and Illinois (59.6 cents/gal).
Do I need IFTA if I only drive in one state?
No. IFTA applies to vehicles operating in two or more IFTA jurisdictions (48 US states and 10 Canadian provinces). If you only operate in one state, you file that state's fuel tax return instead.
What vehicles require IFTA registration in 2026?
IFTA registration is required for vehicles used in interstate commerce with 3 or more axles, or with 2 axles and a gross vehicle weight over 26,000 pounds.
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2026 Quick Reference

Q1 2026 due→April 30
Q2 2026 due→July 31
Q3 2026 due→Oct 31
Q4 2026 due→Jan 31, 2027
Late penalty→$50 or 10%
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