Common IFTA mistakes small fleets make
Seven errors that cost small carriers money, and the fix for each one.
Most IFTA problems in small fleets are not fraud. They are the same handful of recording habits, repeated for a few years until an audit or a penalty notice turns them into a bill. Here they are, with the fix.
1. Leaving out deadhead and personal miles
Every mile the qualified vehicle moves belongs on the return, including empty runs, repositioning, and the trip home. Dropping them lowers total miles, raises your fleet MPG, and understates taxable gallons in every jurisdiction — which is exactly the direction an auditor adjusts against you.
2. Calculating MPG per truck or per state
Fleet MPG is one number: total miles for the quarter divided by total gallons for the quarter, across the whole fleet. Calculating it per truck, per state, or per month produces taxable gallons that will not reconcile with your own totals.
3. Forgetting the surcharge jurisdictions
Kentucky and Virginia charge a surcharge in addition to the diesel rate. The surcharge is computed on taxable gallons, not on net taxable gallons, so it is owed even when your fuel purchases in that state already cover your consumption. Skipping it makes you short every quarter you run those states.
4. Using the wrong quarter's rate table
Rates are published per quarter and they move. Filing a late or amended return with today's rates instead of the rates for the quarter being reported produces an incorrect figure that will not match the jurisdiction's own calculation.
5. Fuel receipts without gallons
A credit card statement line showing a dollar amount is not a fuel record. Claimed purchases need the date, location, gallons, fuel type, and vehicle. Thermal receipts fade — photograph them the day you get them.
6. Skipping the zero return
An idle quarter still needs a return. A missing zero return is treated like any other late filing: penalty, interest on nothing, and a black mark that puts license renewal at risk.
7. No worksheet behind the numbers
The filed return is a summary. If you cannot reproduce how you got there — miles by jurisdiction, gallons by jurisdiction, MPG, taxable gallons, net gallons, rate — you cannot defend it later. Keep the worksheet with the return for the full four years.
A five-minute self-check for last quarter
- 1.Do your jurisdiction miles add up to your total miles, exactly?
- 2.Is your fleet MPG a number the equipment could plausibly produce?
- 3.Did you run Kentucky or Virginia, and is there a surcharge line if so?
- 4.Does every claimed gallon have a receipt showing gallons?
- 5.Can you print the worksheet that produced the filed figure?
How FuelTaxDesk fits in
You enter your own miles and gallons — there is no ELD requirement and no GPS tracker to install. FuelTaxDesk applies the official quarterly rates, handles the Kentucky and Virginia surcharges, produces a printable worksheet you can transcribe onto your base jurisdiction's return, and keeps four years of worksheets on file. Pricing is flat, and you remain the filer of record.
Run your quarter in minutes
Enter your miles and gallons, get a printable worksheet with the official quarterly rates and surcharges applied, and keep four years on file.
Keep reading
General information about IFTA rules, not tax or legal advice. Your base jurisdiction's instructions control, and you remain the filer of record.