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How to Calculate IFTA Taxes for Owner Operators (Step-by-Step Guide)

A complete guide to calculating IFTA fuel taxes for owner operators and fleet owners. Includes formulas, examples, and quarterly filing deadlines.

By TruxlyOS Team·June 16, 2026·8 min read
Truck driver at fuel pump calculating IFTA taxes

What Is IFTA?

The International Fuel Tax Agreement (IFTA) is a cooperative agreement among 48 US states and 10 Canadian provinces that simplifies fuel tax reporting for commercial motor vehicles operating across multiple jurisdictions.

Who Needs to File IFTA?

  • Has two axles and a gross vehicle weight over 26,000 pounds
  • Has three or more axles regardless of weight
  • Is used in combination with a gross vehicle weight exceeding 26,000 pounds

IFTA Filing Deadlines

QuarterPeriodDue Date
Q1January – MarchApril 30
Q2April – JuneJuly 31
Q3July – SeptemberOctober 31
Q4October – DecemberJanuary 31

Step-by-Step IFTA Calculation

Step 1: Track Miles Per Jurisdiction

Record every mile driven in each state or province using your ELD or trip sheets.

Step 2: Calculate Your Fleet MPG

MPG = Total Miles ÷ Total Gallons

Step 3: Calculate Gallons Consumed Per State

Gallons Consumed = Miles in State ÷ Fleet MPG

Step 4: Calculate Tax Owed

Tax Owed = (Gallons Consumed - Gallons Purchased) × State Tax Rate

How TruxlyOS Makes IFTA Easy

TruxlyOS automatically calculates your IFTA report using miles from your loads and fuel purchases from your fuel card. Generate a complete report in seconds.

Try TruxlyOS Free for 14 Days

AI dispatch, invoicing, load board integration, IFTA reports, and more.

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