Free tool
IFTA fuel tax calculator
Enter miles and fuel purchased in each jurisdiction. We work out your fleet MPG, taxable gallons, and net tax due or credit per state for the quarter.
Rules explained: IFTA reporting guide
| Jurisdiction | Miles driven | Gallons bought | Tax rate ($/gal) | Taxable gal | Net gal | Tax due / credit | |
|---|---|---|---|---|---|---|---|
| 630.0 | -70.0 | -$14.00 | |||||
| 270.0 | 120.0 | $24.00 | |||||
| 150.0 | -50.0 | -$14.25 |
Total miles
7,000
Total gallons
1,050
Fleet MPG
6.67
Net credit
-$4.25
Example rows only. Enter the current quarter's rates from the IFTA tax rate matrix (iftach.org). Some jurisdictions add surcharges. This estimate is not a filed return.
IFTA calculator questions
Divide total miles by total gallons to get fleet MPG. For each jurisdiction, miles driven there divided by MPG gives taxable gallons. Subtract gallons you bought there to get net taxable gallons, then multiply by that jurisdiction's rate. Positive is tax due, negative is a credit.
Quarterly: April 30, July 31, October 31 and January 31 for the quarter just ended.
The IFTA tax rate matrix published each quarter by IFTA, Inc. at iftach.org. Rates change, so update them every quarter.