{
  "slug": "ifta-fuel-tax-estimate",
  "title": "IFTA Fuel Tax Estimate Calculator",
  "heading": "IFTA Quarterly Fuel Tax Estimator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/ifta-fuel-tax-estimate",
  "summary": "Rough net tax owed or refunded across your IFTA jurisdictions.",
  "description": "IFTA reconciles fuel tax so you pay based on miles driven in each state, not just where you bought fuel. This simplified estimator handles the two-state case that trips up most single-truck operators: miles driven and gallons purchased in a home state versus everything else, using an average tax rate difference. It computes the fleet MPG for the quarter, the tax-paid gallons versus tax-owed gallons implied by miles driven, and the net amount due or refundable. Real IFTA filings break this out per jurisdiction with published quarterly rates that change, so treat this as a planning estimate to budget cash for filing, not a substitute for your state's IFTA return.",
  "formula": "Net tax = (total miles ÷ MPG − gallons purchased) × avg tax rate per gallon.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=ifta-fuel-tax-estimate",
  "inputs": [
    {
      "id": "totalMiles",
      "label": "Total miles this quarter",
      "kind": "number",
      "hint": null,
      "default": 27000,
      "unit": "mi",
      "min": 1,
      "max": null
    },
    {
      "id": "gallonsPurchased",
      "label": "Gallons purchased (all jurisdictions)",
      "kind": "number",
      "hint": null,
      "default": 4300,
      "unit": "gal",
      "min": 1,
      "max": null
    },
    {
      "id": "avgTaxRate",
      "label": "Average IFTA tax rate",
      "kind": "number",
      "hint": null,
      "default": 0.32,
      "unit": "$/gal",
      "min": 0,
      "max": null
    },
    {
      "id": "avgPurchasePrice",
      "label": "Average price paid per gallon (pre-tax basis)",
      "kind": "number",
      "hint": null,
      "default": 3.9,
      "unit": "$/gal",
      "min": 0,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "netTax",
      "label": "Net IFTA tax due (+) / refund (−)",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "mpg",
      "label": "Fleet average MPG",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "gallonsConsumed",
      "label": "Gallons consumed (by miles)",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "netGallons",
      "label": "Net taxable gallon gap",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "totalFuelSpend",
      "label": "Total fuel spend this quarter",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Total miles this quarter: 27000 mi",
      "Gallons purchased (all jurisdictions): 4300 gal",
      "Average IFTA tax rate: 0.32 $/gal",
      "Average price paid per gallon (pre-tax basis): 3.9 $/gal"
    ],
    "outputs": [
      "Net IFTA tax due (+) / refund (−): $0",
      "Fleet average MPG: 6.28",
      "Gallons consumed (by miles): 4,300",
      "Net taxable gallon gap: 0",
      "Total fuel spend this quarter: $16,770"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter total miles this quarter (mi).",
      "Enter gallons purchased (all jurisdictions) (gal).",
      "Enter average ifta tax rate ($/gal).",
      "Enter average price paid per gallon (pre-tax basis) ($/gal).",
      "Read your net ifta tax due (+) / refund (−) on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "totalMiles": 16200,
        "gallonsPurchased": 2580,
        "avgTaxRate": 0.192,
        "avgPurchasePrice": 2.34
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "totalMiles": 27000,
        "gallonsPurchased": 4300,
        "avgTaxRate": 0.32,
        "avgPurchasePrice": 3.9
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "totalMiles": 43200,
        "gallonsPurchased": 6880,
        "avgTaxRate": 0.512,
        "avgPurchasePrice": 6.24
      }
    }
  ],
  "limitations": [
    "Results are estimates before tax, fees, and inflation unless an input explicitly covers them.",
    "Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.",
    "This is educational maths, not financial advice. Check anything contractual with the lender or your accountant."
  ],
  "faq": [
    {
      "q": "Why would I owe tax if I already paid tax at the pump?",
      "a": "You paid tax to whatever state you bought fuel in, not the states where you actually drove. If you buy most fuel in a low-tax state but run lots of miles through high-tax states, your base jurisdiction return shows a balance due to true it up."
    },
    {
      "q": "Is this exact enough to file with?",
      "a": "No. This is a planning estimate using one blended tax rate. Real IFTA returns require per-jurisdiction miles, per-jurisdiction gallons purchased, and each state's published quarterly rate — use your ELD's IFTA report or trucking accounting software for the actual filing."
    },
    {
      "q": "What if I get a negative number?",
      "a": "A negative net tax means you likely overpaid at the pump relative to miles driven in high-tax jurisdictions, which typically results in a credit or refund on your IFTA return rather than a payment."
    },
    {
      "q": "How can I lower my IFTA exposure?",
      "a": "You can't avoid the tax obligation, but you can smooth cash flow by fueling proportionally to where you actually drive miles, and by setting aside roughly your average net tax rate times monthly miles into a separate account each month."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/fuel-surcharge-recovery",
    "https://www.revenuelab.fyi/toolbox/owner-operator-cost-per-mile",
    "https://www.revenuelab.fyi/toolbox/dot-compliance-cost"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — IFTA Fuel Tax Estimate Calculator (https://www.revenuelab.fyi/toolbox/ifta-fuel-tax-estimate)"
}