IFTA Filing Complete Guide

Who must register and file IFTA?

The vehicle threshold under the IFTA Articles of Agreement P555:

• Two-axle vehicle with declared GVW or registered GVW over 26,000 lbs
• Any vehicle with three or more axles regardless of weight
• Combination of vehicles that exceeds 26,000 lbs combined

Recreational vehicles (single-truck personal use) are excluded. Government vehicles are excluded. Buses depend on the jurisdiction. School buses are usually excluded. Trip-permit vehicles can opt for one-time fuel-trip permits in lieu of registering — common for occasional cross-border movement.

Carriers that operate exclusively within a single jurisdiction do not need IFTA. The moment any qualified vehicle crosses a state line, the entire fleet enrolls in IFTA in the carrier’s base jurisdiction.

How do you pick the base jurisdiction?

The IFTA base jurisdiction is the single state where the carrier:

• Maintains the operational records (dispatch, fuel records)
• Has at least one IFTA-qualified vehicle registered
• Accrues mileage

Most carriers base in their home state, but the rules permit registration in any state that meets the three criteria. Once registered, the base state issues an IFTA license (a single document) plus two IFTA decals per qualified vehicle (one for each side of the cab). The license and decals must be carried in the cab while operating.

When are IFTA returns due?

• Q1 (Jan–Mar): Return due April 30
• Q2 (Apr–Jun): Return due July 31
• Q3 (Jul–Sep): Return due October 31
• Q4 (Oct–Dec): Return due January 31

File electronically through the base state’s online IFTA portal. Most states require electronic filing for fleets of any size. The return is due even if no operation occurred in the quarter — a “zero return” is required. Late or missing returns can lead to suspension or revocation of the IFTA license, and IFTA standing is checked at IRP plate renewal in many states.

What goes on the IFTA return?

The quarterly return reconciles two columns by jurisdiction:

1. Total miles in the jurisdiction — from the carrier’s individual vehicle mileage records (IVMRs) or ELD output.
2. Total fuel purchased in the jurisdiction — from receipts and bulk-fuel disbursement records.

The base state takes the carrier’s overall fleet MPG (total miles ÷ total fuel purchased anywhere), multiplies it by the miles in each state, and computes “tax-paid gallons” that should have been purchased in each state. The difference between “should have been” and “actually purchased” multiplied by that state’s tax rate produces the net amount owed or credited.

Tax rates are published quarterly by the IFTA Inc. organization. They range from $0.18/gal (Wyoming) up to $0.50+/gal (Pennsylvania, California). A typical Class-8 tractor running 100,000 mi/year owes $7,000–$11,000 in net IFTA over four quarters. Most of that is paid at the pump; the IFTA return resolves the difference. Use our IFTA calculator to estimate the net for any quarter.

Which records must you keep for 4 years?

IFTA requires every licensee to retain operational records for 4 years from the return due date. The records:

• Individual vehicle mileage records (IVMRs): date, route, beginning and ending odometer, jurisdiction-by-jurisdiction breakdown
• ELD output exports per quarter
• Fuel receipts: date, location, gallons, price, fuel type, vendor
• Bulk-fuel withdrawal logs (if you operate an on-site tank)
• Trip permits used in lieu of IFTA

State auditors can request these records up to 4 years back. A failed audit retroactively assesses the underreported tax plus penalties and interest.

What happens if you file late or miss a quarter?

Late filing or underpayment triggers, in order:

1. A late filing penalty assessed by the base jurisdiction.
2. Interest on the unpaid amount.
3. License suspension after the second consecutive late return.
4. License revocation after a third late return or unresolved tax debt.

Once IFTA is revoked, the next IRP plate renewal will be denied in most jurisdictions because the IRP application requires proof of IFTA standing. Reinstating IFTA at that point requires curing the back tax plus all accumulated interest and penalties.

How is IFTA different from IRP?

IFTA covers fuel tax; IRP covers vehicle registration tax. They are separately administered, separately renewed, and separately enforced — but they require essentially the same mileage records to compute. Most carriers file both in the same online portal in the base state, but the renewals come on different annual cycles.

Read our parallel IRP registration guide for the registration side.

Which practical strategies help owner-operators?

• Buy fuel in low-tax states for net IFTA savings. The math: a 10-cent-per-gallon spread on 12,000 gallons annually is $1,200/year if you can route through the right pumps. Real value, but easy to over-optimize.
• Pull ELD mileage exports the same week the quarter closes. Reconcile against fuel receipts before filing. Fix discrepancies up front, not under audit.
• For fleets of 5+ trucks, consider commercial IFTA software (KeepTruckin, Samsara, Geotab) that auto-generates the return from ELD data. Manual filing for any fleet of 3+ is a recipe for errors.
• If you bulk-fuel on-site, document withdrawals with date, gallons, vehicle, and odometer. Bulk fuel without records is treated as “zero tax paid” in audit, which is the worst possible outcome.

How do you prepare for an IFTA audit?

A typical IFTA audit covers 4–8 quarters. The state auditor pulls vehicle records (IVMRs or ELD output), fuel receipts, bulk-fuel logs, and the corresponding IFTA returns. The reconciliation looks at three things:

• Total miles reported vs total miles documented in IVMRs / ELD.
• Total fuel reported vs total fuel documented in receipts and bulk logs.
• Per-jurisdiction allocation of miles — does the carrier’s declared route map match the documented operations?

Common audit deficiencies:

• ELD-derived miles disagree with reported miles by >5%.
• Fuel receipts missing or illegible. Receipts that lack date, location, or gallons disqualify the gallons from the “tax-paid” column.
• Bulk-fuel withdrawals without per-vehicle documentation are treated as zero tax paid.
• Reported miles in a jurisdiction the carrier never legally entered (typically a clerical error during quarterly preparation).

An audit assessment is the underreported tax plus the penalties and interest set by the base jurisdiction.

Can trip permits replace IFTA?

Carriers running occasional cross-border trips can purchase one-time fuel-trip permits in lieu of registering for IFTA in their base state. Trip permits cost $20–$50 per state per trip and are issued by the state’s motor fuel agency.

The math: a fleet running 6+ cross-border trips per year generally saves money registering for IFTA over buying trip permits. Below that threshold trip permits are cheaper, especially for one-time movements like delivering a single load to a state the carrier rarely enters.

Trip permits do not exempt the vehicle from IRP registration or any other federal compliance. They are purely a fuel-tax mechanism.