What records do I need to keep for IFTA?

You need odometer readings at the start and end of each trip, fuel purchase receipts (showing date, vendor, location, gallons, and fuel type), and trip records showing the route driven including state-by-state mileage. Keep all records for at least 4 years — that's the IFTA audit lookback period.

What happens if I file my IFTA return late?

Late filing incurs a $50 penalty or 10% of the net tax due (whichever is greater) plus monthly interest on the unpaid balance. Repeated late filings can lead to license revocation. Set calendar reminders for the quarterly deadlines: April 30, July 31, October 31, and January 31.

Do I need IFTA if I only drive in one state?

No. IFTA is only required for qualified motor vehicles that travel in two or more IFTA jurisdictions (48 US states + 10 Canadian provinces). If you operate exclusively within one state, you're exempt from IFTA but still subject to that state's fuel tax requirements.

What triggers an IFTA audit?

Common audit triggers include: filing returns with consistent zero or near-zero tax liability, large discrepancies between reported and expected MPG, late filings, complaints from other jurisdictions, random selection, and significant changes in reported mileage or fuel purchases from quarter to quarter.

Can my dispatch service help with IFTA?

Yes. Dispatch services that track your loads and routes can provide detailed mileage records that support your IFTA filing. At Truck Dispatch Experts, we maintain load records that help carriers build accurate quarterly reports.

IFTA Filing Guide | Truck Dispatch Experts

What Is IFTA?

IFTA (International Fuel Tax Agreement) is an agreement between 48 US states and 10 Canadian provinces that simplifies fuel tax reporting for interstate carriers. Instead of filing separate fuel tax returns with each state you drive through, IFTA lets you file one quarterly return through your base (home) jurisdiction, which then distributes taxes to the other states.

You need an IFTA license if you operate a qualified motor vehicle — any vehicle used, designed, or maintained for transportation of persons or property and that has two axles and a gross vehicle weight or registered gross vehicle weight exceeding 26,000 pounds, or has three or more axles regardless of weight, or is used in combination when the combined weight exceeds 26,000 pounds.

IFTA calculation example showing state-by-state mileage fuel purchases and net tax owed — IFTA redistributes fuel tax based on where you actually drove — not where you bought fuel

Quarterly Filing Deadlines

Jan - Mar

Due: April 30

Apr - Jun

Due: July 31

Jul - Sep

Due: October 31

Oct - Dec

Due: January 31

Late returns incur a $50 minimum penalty or 10% of net tax due (whichever is greater), plus monthly interest on unpaid balances.

Step-by-Step: Filing Your IFTA Return

Gather Your Records

Collect all fuel receipts and trip records for the quarter. You need: fuel purchase receipts (date, location, gallons, amount), odometer readings at the start and end of each trip, and mileage by state/province for each trip.

Calculate Miles Per State

Total your miles driven in each IFTA jurisdiction. Use GPS records, ELD data, or trip sheets. Be accurate — discrepancies between reported mileage and what your truck's systems show are a top audit trigger.

Calculate Total Fuel Purchased Per State

Total gallons of fuel purchased in each state. Your fuel receipts must show the state of purchase. Credit card statements alone are not sufficient — you need actual receipts.

Determine Your Fleet MPG

Divide total miles driven by total gallons consumed: Total Miles ÷ Total Gallons = Fleet MPG. This is your overall fleet fuel efficiency for the quarter. Most loaded semis average 5.5-7.0 MPG.

Calculate Taxable Gallons Per State

For each state: Miles in State ÷ Fleet MPG = Taxable Gallons. This represents the fuel you theoretically consumed in that state based on your fleet efficiency.

Calculate Net Tax Per State

(Taxable Gallons - Purchased Gallons) × State Tax Rate = Net Tax. If positive, you owe that state. If negative, you get a credit (you bought more fuel there than you consumed).

File Through Your Base Jurisdiction

Submit your return through your home state's IFTA portal. Most states have online filing systems. Pay any net tax owed. Credits from one state offset taxes owed to another.

Try our free tool: Use our IFTA Tax Calculator to estimate your quarterly tax before filing. Enter miles and gallons per state to see what you'll owe or be credited.

Common Mistakes That Trigger Audits

IFTA audits examine 4 years of records. These mistakes put you on the radar:

Unrealistic MPG

Reporting 9+ MPG for a loaded semi is a red flag. Auditors know realistic ranges by equipment type.

Missing Fuel Receipts

You need receipts for every fuel purchase. No receipt = no credit for that purchase during an audit.

Estimated Mileage

Using round numbers or estimates instead of actual mileage data signals inaccuracy to auditors.

Consistent Zero Liability

Filing returns showing $0 owed quarter after quarter is unusual and draws attention.

Record-Keeping Best Practices

Keep all fuel receipts for 4 years minimum — that's the IFTA audit lookback period
Use a fuel card that provides detailed reporting by state and date
Record odometer readings at every state line crossing
Use your ELD data to verify state-by-state mileage
Scan or photograph paper receipts as backup — paper fades
Reconcile your records monthly, not just at quarter end

Many trucking accounting software programs (like Motive and ATBS) can automate much of the IFTA tracking process using ELD integration and fuel card data.

Related Resources

FMCSA IFTA Information — Official IFTA registration and compliance details
Fuel Cost Calculator — Estimate fuel expenses for any route
IFTA Tax Calculator — Calculate your quarterly fuel tax obligation
New Authority Checklist — Complete setup guide including IFTA licensing

TDE

Truck Dispatch Experts

Published May 20, 2025 · Updated Jan 10, 2026

IFTA Filing Guide for Truckers