What An IFTA Auditor Does When Your Records Fall Short

The assessment is not a judgment call

Carriers tend to walk into a fuel tax audit expecting a conversation. It is closer to a formula. IFTA Procedures Manual Section P570 says that when the records a licensee produces do not meet the adequacy standard for the fleet as a whole, or when the licensee produces nothing after a written demand, the base jurisdiction shall impose an additional assessment. Not may. Shall. The auditor is applying a rule, not forming an opinion about your operation.

Adequacy has its own definition. Section P530 splits it into sufficiency, meaning enough records to substantially document the fleet, and appropriateness, meaning the records carry the kind of information an auditor actually needs. Section P520 puts the burden of proof on the licensee. If the basics are still fuzzy, our IFTA explained guide covers who qualifies, the quarterly deadlines and how the tax gets redistributed.

Three levers, and why 4.00 stings

Section P570.100 gives the jurisdiction three ways to impose it. It can reduce your reported fleet average to 4.00 miles per gallon, or 1.70 kilometres per litre. It can instead cut your reported average fuel consumption factor by 20 percent. Or, in jurisdictions that tax distance rather than fuel volume, it can raise jurisdictional distance by 20 percent while leaving total distance untouched.

The 4.00 figure does the damage because taxable gallons in each jurisdiction are miles divided by your fleet average. A truck credited with 6.5 miles per gallon over 40,000 quarterly miles burns roughly 6,150 gallons across the states on that return. Reset the average to 4.00 and the same 40,000 miles become 10,000 gallons. Nothing about the operation changed. The arithmetic did, and every jurisdiction bills on the new figure while your tax paid credits stay exactly as documented.

The format trap that sinks good GPS data

This is where carriers with real telematics still fail. Section P540.200 governs distance records from a vehicle tracking system using latitude and longitude. It requires a record at least every 10 minutes while the engine is on, coordinates to a minimum of four decimal places, the engine control module odometer reading at each reading, and the vehicle identification or unit number.

Then it gets specific about delivery. That data must be accessible in a spreadsheet format such as XLS, XLSX, CSV or a delimited text file. Static images are named and rejected, so a PDF, JPEG, PNG or Word export does not satisfy it. Section P530 closes the loop by stating that records presented in a format the base jurisdiction cannot audit have not been made available. A clean telematics history exported the wrong way reads to an auditor as no history at all.

Fuel receipts, and the credit that quietly disappears

Section P550.300 lists what a valid retail receipt or transaction listing has to carry. Date of purchase, name and address of the seller, quantity, fuel type, price per volume or total price, identification of the qualified motor vehicle the fuel went into, and the name of the purchaser. A receipt that does not identify the truck fails the list, and Section P550.200 blocks credit for any record that is altered or illegible.

Here is the part that catches people. Audit Manual Section A360 says the absence of tax paid receipts, and the denial of the credits claimed on them, does not by itself justify reducing your reported total fuel. The gallons stay on the return. The credit is what vanishes.

Penalties, interest and the clocks

Articles of Agreement Section R1220 adds a penalty of 50 dollars or 10 percent of delinquent taxes, whichever is greater. Section R1230 sets United States interest two percentage points above the Internal Revenue Code Section 6621(a)(2) underpayment rate, adjusted each January 1 and accruing monthly at one twelfth of the annual rate. IFTA Inc. lists the rate effective January 1, 2026 as 9 percent against a 7 percent underpayment rate, so 0.75 percent a month, and a full month accrues for any part of a month the tax sits unpaid.

The windows are short. Section R1210 requires a written request giving you 30 days to produce records, Section A420 says you should be contacted at least 30 days before the audit begins, and Section R1390 allows at least 30 calendar days from notification of findings to appeal in writing. An estimated assessment is presumed correct, and Section R1210.300 leaves it to you to prove by a fair preponderance of evidence that it is erroneous or excessive.

Where this touches your insurance

A fuel tax assessment is a debt, not a loss. No commercial auto liability policy, no physical damage form and no cargo policy responds to it, because nothing was damaged and nobody was hurt. It comes out of the operation, and if the license is revoked the trucks stop while the equipment notes keep coming due. The records are the second link. Mileage by jurisdiction is the same evidence that describes your radius to an underwriter, and radius is a core rating factor in what your truck insurance costs. Section P510 requires four years of retention, and a carrier who can produce four clean years for an auditor can produce them for an adjuster.

We are an insurance agency and not your fuel tax preparer, so we will be straight about that line. We keep the insurance side easy while you keep the records tight. Get a truck insurance quote in under a minute, or call or text 423-264-4255 and talk to a licensed agent. Still sorting out qualification and quarterly deadlines, start with our IFTA basics page, then get your quote here.