---
title: "IFTA fuel tax calculator"
description: "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."
canonical: https://mydotcheck.com/tools/ifta-calculator
last_updated: 2026-10-17
---

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](/ifta-reporting)

| 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 |  |

Add jurisdiction

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.

## Get a reminder before it's due

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## IFTA calculator questions

### How is IFTA tax calculated?

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.

### When are IFTA returns due?

Quarterly: April 30, July 31, October 31 and January 31 for the quarter just ended.

### Where do I find current IFTA tax rates?

The IFTA tax rate matrix published each quarter by IFTA, Inc. at iftach.org. Rates change, so update them every quarter.

---
Canonical URL: https://mydotcheck.com/tools/ifta-calculator
Title: IFTA fuel tax calculator