Solo owner-operator IFTA filing: quarterly worksheet and state rate lookup (no software)

A one-truck operation files IFTA the same way a 500-truck fleet does: record fuel purchases by state, divide total miles by total gallons to get average MPG, calculate tax owed in each state, then file Form 208 with IFTA Inc. by the due date.

Your filing window closes 30 days after each quarter ends

Q1 (January–March) due April 30; Q2 (April–June) due July 31; Q3 (July–September) due October 31; Q4 (October–December) due January 31. Late filing penalties run $50 or 10% of tax owed—whichever is greater—plus interest. You must file every quarter, even if you stayed in your home state all three months.

The three-number calculation: miles, gallons, then state tax rates

Step 1 is total miles driven across all jurisdictions in the quarter. Step 2 is total gallons of fuel purchased (from receipts) in the quarter. Step 3 is dividing miles by gallons to get your fleet MPG. This single MPG figure applies to all states you operated in. Once you have fleet MPG, the per-state math is mechanical.

Four-state Q2 2026 example: 9,400 miles, 1,410 gallons purchased

You ran 2,800 miles in Texas, 2,100 in Oklahoma, 2,400 in Missouri, 2,100 in Kansas. You purchased 520 gallons in Texas, 310 in Oklahoma, 390 in Missouri, 190 in Kansas.

Fleet MPG: 9,400 miles ÷ 1,410 gallons = 6.67 MPG

Taxable gallons per state are calculated by dividing your miles in that state by your fleet MPG:

Your total tax owed is $258.60. You already paid $254.30 in fuel tax at the pump across all four states. Your net quarterly result: you owe $4.30 to your base jurisdiction by July 31.

Fuel tax you already paid at the pump becomes a credit

Every gallon you buy has state fuel tax baked into the price; your fuel receipt shows this. IFTA requires you to subtract what you already paid in each state from what you owe. In Texas, you purchased 520 gallons at $0.20/gallon, paying $104.00 in fuel tax at the pump. Your actual taxable consumption in Texas was only 420 gallons, so you owe only $84.00. That $20.00 overpayment becomes a credit on your quarterly return.

If a state's credit exceeds tax owed, you receive a refund. Oklahoma in this example: you owed $40.95 but paid $40.30, so you get a $0.65 refund. All credits and debits roll into your total quarterly return. If your total credits exceed total tax owed across all states, your base jurisdiction cuts you a check.

Indiana, Kentucky, Virginia, and New York add surcharges on top of base rates

Indiana's surcharge pushes the effective rate to $1.22 per gallon—highest in the country for 2026. Kentucky adds $0.105 per gallon, Virginia adds $0.143 per gallon, and New York varies by region. Surcharges apply to taxable gallons, not purchased gallons. If you drove 500 miles in Indiana but only bought 50 gallons of fuel there, your taxable gallons in Indiana would be around 75 (at typical 6.67 MPG), and you'd owe the surcharge on all 75, not just the 50 you purchased. This edge case catches owner-operators: surcharge states hit your consumption, not your fuel stops.

Where to find this quarter's official rate table

IFTA Inc. publishes the master rate matrix before each quarter starts. Use the rates in effect during the quarter you're reporting, not the rates when you file. If you're filing your Q2 return in July, you use Q2 rates, not the Q3 rates that just went live.

State-specific sources include the Texas Comptroller IFTA page, Colorado DOR, Michigan's IFTA page, and New York Form IFTA-101 instructions. Rates change quarterly; bookmarking the IFTA Inc. page saves time every filing cycle. Many carriers print the rate table and post it in the truck so fuel-stop staff can verify calculations on the spot.

Keep fuel receipts and mileage logs; reefer fuel doesn't count

Audit trail requires every fuel receipt to show gallons, price per gallon, fuel type (diesel vs. gasoline), and location (state). Mileage proof must be in editable spreadsheet format (XLS/CSV), not PDF screenshots. As of 2024, IFTA requires distance data in editable formats; static image PDFs no longer satisfy audit requirements.

Reefer fuel exclusion is critical: fuel used to power refrigeration units on your trailer is NOT reported on IFTA. Only count fuel for the tractor. If you're running a reefer and buying 500 gallons total per quarter—350 for the truck, 150 for the reefer—your IFTA report uses 350. Keep all records for 4 years from filing date.

If you drove into Canada, convert liters and kilometers to US units

One kilometer equals 0.62137 miles; multiply km by 0.621 to get miles. One liter equals 0.2642 gallons; multiply liters by 0.2642 to get gallons. Canadian provinces are IFTA members, and fuel purchased in Canada gets the same credit treatment as US fuel. Track Canadian fuel and miles separately until conversion, then roll into the same calculation. If you drove 500 km in Ontario and bought 100 liters, that's 310 miles and 26.42 gallons on your worksheet.

File Form 208 with your base jurisdiction's online portal

Your base jurisdiction provides the quarterly return form and filing portal. Most offer automated online filing; the system calculates tax owed to each jurisdiction you list. Form 208 names each state or province where you operated, lists miles, taxable gallons, rates, and tax owed per state.

Online filing is faster and less error-prone than paper, and most jurisdictions let you see the calculation before you submit. The system catches arithmetic mistakes that hand-calculation misses. You'll typically see a summary screen showing total tax owed, total credits, and net amount due or refund before you hit submit.

When self-filing makes sense and when it stops being enough

One truck, predictable routes in 3 or 4 states per quarter: self-filing is 20 minutes of work per quarter. You need a spreadsheet template (free), the quarterly rate table (free), and your fuel receipts and mileage logs.

High-surcharge states (Indiana, Kentucky), Canadian operations, or frequent spot runs into new states push the tracking burden up fast. The moment you're spending 2+ hours per quarter cross-checking rates, receipts, and edge cases—or tracking reefer fuel separately—a $25/month filing service breaks even on time alone. Self-filing is genuinely free, but the time cost compounds. The owner-operator who benefits most from self-filing is the one who runs the same four states every quarter, buys fuel consistently, and doesn't mind the spreadsheet work.