State-by-state IFTA mileage chart: exact odometer breakpoints for Q2 2026 multi-state reporting

A driver crossing state lines must record odometer readings at every border crossing because state DOR auditors require jurisdictional mile allocation to match fuel purchases by state, not GPS estimates or fuel-spend math.

Odometer readings at state lines are the only audit-defensible mileage record

IFTA auditors reject GPS traces and fuel-spend estimation as sole sources of proof. The Iowa DOT clarified in 2024 that distance records from tracking systems must log latitude/longitude every 10 minutes with a minimum of 4 decimal places; static PDFs no longer qualify as audit-defensible records.

Your working chart must show entry odometer, exit odometer, jurisdictional miles, fuel purchased in that state, and MPG calculation. This is the only document that survives scrutiny when a DOR examiner pulls your file. Auditors will cross-reference your odometer-derived miles against your fuel purchase receipts by state. If you claim 1,800 Texas miles but only bought 200 gallons in Texas, the examiner will ask for the math. Odometer readings answer that question.

Q2 2026 IFTA tax rates vary by 730% — Indiana's effective rate is $1.22/gal, Wyoming's is $0.14/gal

Indiana imposes a $0.61/gallon base rate plus a $0.61/gallon surcharge, reported on Schedule 2, for a total effective rate of $1.22 per gallon—the highest in all IFTA jurisdictions. Kentucky ($0.1050/gal) and Virginia ($0.1430/gal) add separate surcharges to their base rates. Oregon does not use per-gallon rates at all; it uses a weight-mile tax instead, requiring a separate account.

A 5,000-gallon quarterly refill routed through Indiana versus Wyoming creates a $5,400 tax difference on the same fuel volume. A driver who buys 350 gallons in Texas at $0.20/gal pays $70 in tax; the same 350 gallons purchased in Indiana costs $427. The location of the fuel purchase directly determines your quarterly tax liability.

Worked example: a three-state Q2 route with real odometer breakpoints and Q2 2026 rates

An owner-operator runs 5,200 total miles in Q2 2026 crossing Texas, Oklahoma, and Missouri. The route breaks down as 1,800 miles in Texas, 1,400 miles in Oklahoma, and 2,000 miles in Missouri. Over the quarter, the driver purchases 760 gallons total: 350 gallons at Texas pumps, 200 gallons at Oklahoma pumps, and 210 gallons at Missouri pumps. The fleet average MPG across all fuel types and states is 6.84.

Here is the jurisdictional allocation:

The critical audit friction: the driver purchased 210 gallons in Missouri but only drove 2,000 miles there. At 6.84 MPG fleet average, 2,000 miles would consume approximately 292 gallons. The remaining 350 gallons must be allocated across Texas and Oklahoma according to the miles driven in each state. This reconciliation is what auditors examine. If your fuel-purchase locations don't align with your mileage locations, you must explain the math. Odometer readings prove you drove those miles; fuel receipts prove where you bought fuel. The chart reconciles the two.

IFTA does not exempt any mileage under 100 or 150 miles — all miles count

A common misconception is that short interstate runs or border-area driving are exempt from IFTA reporting. Every mile driven in a jurisdiction must be recorded and reported, even if you only crossed the state line once per quarter.

Tax-exempt miles (certain public roads, private property, or specific-use cases per jurisdiction) still appear on your quarterly return as total miles but are deducted from taxable miles. They do not disappear from your chart. You must document them separately and explain why they are exempt. Auditors see incomplete mileage records as fraud. Penalties are the greater of $50 or 10% of net tax liability.

Your mileage chart must survive a 3% audit probability and 4-year retention rule

IFTA jurisdictions audit approximately 3% of fleets annually. When selected, carriers must produce original daily distance records for every power unit. All records must be retained for a minimum of four years in electronic spreadsheet format (XLS, CSV). Image PDFs are no longer compliant as of 2024.

Auditors will compare your odometer-derived mileage chart against fuel purchase records and DOR fuel tax receipts. Any discrepancy triggers an estimated assessment. The best case is a 20% MPG reduction; the worst case is adjustment to 4.00 MPG or 1.70 KPL across your entire fleet. Electronic logs reduce inconsistencies. Manual odometer logs require legible, dated driver signature on each entry. A single unsigned or illegible entry can trigger re-calculation of your entire quarterly report.

How to build your Q2 2026 mileage chart from ELDs, telematics, or manual logs

ELDs log GPS every 10 minutes when the engine is on. Extract data in CSV format and filter by state boundary crossings. Most compliance platforms trigger state-line detection automatically using latitude/longitude coordinates and cross-reference those timestamps against your odometer readings in vehicle inspection reports or driver logs.

Telematics systems timestamp each border crossing with coordinates and odometer reading, creating an auditable mileage record. Pair telematics output with fuel purchase receipts to verify jurisdiction-specific MPG.

The manual method requires the driver to record odometer at each state-line entry and exit, calculate the difference, and create a spreadsheet row per jurisdiction per trip. Total those rows by state for your quarterly chart. All three methods require reconciliation against fuel purchase receipts. Total fuel purchased in a state divided by total miles driven in that state equals your fleet's jurisdiction-specific MPG. If you claim 2,000 Texas miles but only 200 gallons purchased in Texas, auditors will request an explanation or reduce your claimed miles. Odometer readings at border crossings are your proof.