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compliance calculator

IFTA Fuel Tax Calculator

Estimate quarterly IFTA fuel tax due based on miles per state and gallons purchased.

  • Updated July 10, 2026 · reviewed by the Bonafide Dispatch operations team
  • Free · no signup · nationwide (all 50 U.S. states)
  • 2026 U.S. freight benchmarks built in
Quick answer

IFTA tax due = (state miles ÷ fleet MPG × state rate) − tax already paid at the pump in that state.

Updated Reviewed by the Bonafide Dispatch operations teamFree · No signup · Works nationwide (all 50 U.S. states)
Quick facts
Category
Compliance
Formula
State Tax Due = (Miles ÷ MPG × Rate) − (Gallons Purchased × Rate).
Inputs
4
Best for
Owner-operators & fleets
Inputs
Results
Net tax due in state
$53.85
You owe this
Gallons consumed
692.3 gal
2026 U.S. reference benchmarks
Reviewed quarterly · DOE EIA · ATA · ATRI · FMCSA · DAT/Truckstop
U.S. avg diesel fuel tax
$0.24 – $0.68 /gal

Source: IFTA Inc. quarterly rate matrix, Q2 2026

Fuel tax share of total CPM
8% – 12%

Source: ATRI operational costs, 2025→2026

Highest IFTA state tax
California ($0.68+/gal)

Source: IFTA Inc., Q2 2026

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What this calculator does

Estimate quarterly IFTA fuel tax due based on miles per state and gallons purchased.

Definition
IFTA — IFTA is the International Fuel Tax Agreement. It reconciles fuel tax across U.S. states and Canadian provinces.

Why it matters

Owner-operators and fleet managers across the United States — from Texas and California freight lanes to the Midwest and Southeast — rely on the ifta numbers to price loads, negotiate with brokers, and protect margin. Getting this figure right is the difference between a profitable week and a break-even one, and it's the same math our dispatchers run on every load we book.

Methodology

This calculator uses the industry-standard formula shown below. Inputs and defaults are based on Bonafide's day-to-day dispatch operations across U.S. carriers, cross-checked against FMCSA guidance and DAT/Truckstop market data. Results render as plain text (not canvas or images) so they're readable by screen readers, search engines, and AI assistants.

How to use it

  1. Step 1
    Run it per state

    IFTA is a state-by-state reconciliation.

  2. Step 2
    Use the IFTA-published rate

    Rates change quarterly. Pull from the official IFTA matrix.

The formula

State Tax Due = (Miles ÷ MPG × Rate) − (Gallons Purchased × Rate).

Worked examples

  • Example 1
    Texas Q1
    miles
    4500
    mpg
    6.5
    rate
    0.2
    purchased
    800
    Result: −$21.54 (credit)

FAQ

When is IFTA due?

Quarterly: April 30, July 31, October 31, January 31.

What records do I need?

State-by-state mileage plus every fuel receipt with date, gallons, and state.

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