Reference

Do you have to file IFTA?

Two separate questions get muddled together: whether your vehicle counts, and whether you need a licence. The first has a precise definition. The second is your base jurisdiction's call, and this page will not pretend otherwise.

The vehicle test

What makes a vehicle "qualified"

IFTA reporting applies to a qualified motor vehicle, and the Agreement defines that term exactly. A vehicle used, designed or maintained to carry people or property qualifies if any one of these is true:

Two axles
and a gross vehicle weight or registered gross vehicle weight exceeding 26,000 pounds (11,797 kg). Registered weight counts even if you never load it that heavy.
Three or more axles
regardless of weight. This is the one that surprises people — a light three-axle truck qualifies on axle count alone.
In combination
when the combination exceeds 26,000 pounds gross or registered gross weight. A light tractor pulling a heavy trailer is measured together, not separately.

Recreational vehicles are excluded outright — IFTA Articles of Agreement (rev. 2026-03-11), R245.

What this page will not tell you

Whether you personally need an IFTA licence is decided and administered by your base jurisdiction — the member jurisdiction where your vehicles are registered, where your operational records live, and where some of your travel is accrued (R212). One licence, one base jurisdiction, and that jurisdiction has primary responsibility for administering the Agreement for you (R150).

A summary you will see everywhere adds "and you operate in two or more jurisdictions." That is the ordinary shape of it, but it is not a line this page can quote from the Agreement, so it is not stated here as a rule. Ask your base jurisdiction. That is a free phone call and it is the answer that actually binds.

What counts as taxable

Report all of it, then subtract what is exempt

All fuel in the tank
Fuel that is normally subject to consumption tax is taxable unless you prove otherwise, and you must report all fuel placed in the supply tank that propels the qualified vehicle (IFTA Articles of Agreement (rev. 2026-03-11), R820).
Exempt still gets reported
A jurisdiction may exempt some use of fuel within its borders — but exempt use must still be reported under the Agreement, and it is on you to get that jurisdiction's own definition of what qualifies (R830). An exemption you never wrote down is indistinguishable from an omission.

Recordkeeping

Four years, and seven things per trip

This is where an audit is won or lost, and it is the part that is entirely within your control before anyone asks.

How long

Four years from the date the return was due or the date it was filed, whichever is later — plus any period covered by a waiver or a jeopardy assessment. Records must be made available for audit to any member jurisdiction on request (IFTA Procedures Manual (rev. 2026-01-05), P510).

If your records are not kept in your base jurisdiction and its auditors have to travel to them, that jurisdiction may require you to pay their reasonable per diem and travel costs. Where the paperwork lives is a cost decision, not just a filing one.

A trip record has to contain seven elements

the beginning and ending dates of the trip
the origin and destination
the route of travel
beginning and ending odometer, hubodometer or ECM reading for the trip
the total distance of the trip
the distance travelled in each jurisdiction during the trip
the vehicle identification number or unit number

IFTA Procedures Manual (rev. 2026-01-05), P540.100 — the list a base jurisdiction must accept as adequate for records not produced by a vehicle-tracking system.

If you use GPS instead

A vehicle-tracking system using latitude and longitude must create and keep a reading at least every 10 minutes while the engine is on, each with the date and time and a latitude and longitude carrying at least four decimal places (IFTA Procedures Manual (rev. 2026-01-05), P540.200). A device that logs every half hour, or rounds its coordinates, is not producing records that meet this.

What inadequate records cost

They do not fine you. They reassess your MPG

This is the part that surprises people, and it is why the seven elements above are worth the trouble.

If your records do not adequately document the fleet, or you produce none after a written demand, the base jurisdiction shall impose an additional assessment — and the way it does that is to reduce your reported fleet fuel consumption to 4.00 MPG, or cut your reported figure by 20%, whichever the rule directs. For a jurisdiction that taxes by distance instead, it increases your jurisdictional distance by 20%.

Taxable gallons are miles divided by MPG, so a lower MPG means more taxable gallons in every jurisdiction at once. Take the worked quarter from Florida's own instructions — 5.30 MPG on 4,340 gallons. Reassessed at 4.00, the same miles become 5,750 taxable gallons: 1,410 more gallons taxed, about 32% on top, before any penalty or interest.

Separately from that, the base jurisdiction may disallow tax-paid credit for fuel purchases that are not adequately documented — so badly-filed receipts cost twice — and may suspend, revoke or cancel the licence.

IFTA Procedures Manual (rev. 2026-01-05), P570.100 and P570.200. The figures above are computed with the same arithmetic CabPurser uses, from the worked quarter in Florida HSMV Form 85800 — an illustration of the mechanism, not a prediction about your fleet.

Adequacy is not a checklist. P530 defines it as sufficiency and appropriateness — enough records, of the kind an auditor needs — and says outright that records missing some of the elements above may still be adequate, while records in a format the jurisdiction cannot audit have not been made available at all. Keeping them somewhere readable matters as much as keeping them.

If the answer was yes

Then the quarterly part starts

When
Every filing deadline through 2028, with the weekend roll-forward applied — and a quarter you did not operate in still requires a return.
At what rate
This quarter's rate for all 58 jurisdictions, four fuel types, read from IFTA's own matrix.
How the math goes
The return column by column — or put a quarter through the estimator and see the figures for yourself.

This page quotes IFTA's governing documents; it is not tax advice and it is not a substitute for your base jurisdiction's own instructions, which are the ones that bind you. Have a qualified tax preparer review any return before you file it.

Not live yet

If it does apply to you, it applies four times a year

CabPurser is being built for 1–10 truck carriers who file IFTA themselves, so the quarter is already assembled when the deadline arrives.

Email sales@cabpurser.com Back to the overview

Goes to a person, not a drip sequence.