A fuel surcharge applied to accessorials is a contract question rather than an automatic error. The answer lives in your carrier’s rules tariff and in the accessorial schedule your agreement incorporates. Some tariffs state that the surcharge applies to linehaul only. Some state that it applies to linehaul plus specified accessorials. Many say nothing legible at all, which is where the money leaks.
So the check is not “did they charge fuel on the liftgate.” The check is two steps: work out what dollar figure the carrier multiplied by to get the fuel line, then read what the tariff says that base is supposed to be. If those two disagree, you have a finding you can state in one sentence.
Almost nobody runs this check. The fuel line on an LTL invoice is a single number with a percentage next to it, and the percentage is usually right, so it passes a glance. The base underneath it is where the error hides.
The two-line arithmetic that exposes the base
An LTL fuel surcharge is a percentage. The invoice normally prints the percentage and the resulting dollars. Divide one by the other and you get the number the carrier applied the percentage to.
Take an illustrative invoice:
| Line | Amount |
|---|---|
| Linehaul after discount | $850.00 |
| Liftgate | $85.00 |
| Residential delivery | $42.00 |
| Fuel surcharge, 40.0% | $390.80 |
| Total | $1,367.80 |
$390.80 ÷ 0.40 = $977.00. That is not the linehaul. It is $850.00 + $85.00 + $42.00, the linehaul plus both accessorials. The carrier applied fuel to everything above it.
Had the surcharge applied to linehaul only, the fuel line would read $340.00. The difference on this one illustrative shipment is $50.80, or about 3.7 percent of the invoice, produced entirely by a base definition nobody read.
Run that division on ten invoices from one carrier and you will get a consistent answer, because the base is a system setting, not a per-load decision. That consistency is what makes this worth an hour. If the base is wrong, it is wrong on every shipment you have moved with that carrier this year.
When the invoice does not print the percentage
Some invoices show only the dollar amount. You still have options. Look up the carrier’s published surcharge for the applicable week, which means pinning down which DOE week governs the shipment first, then divide. If the quotient lands exactly on the linehaul, you are fine. If it lands exactly on linehaul plus one or more accessorial lines, you have found the base.
And if the invoice does not itemize enough to do either, ask for itemization. Under 49 CFR 373.103, a freight or expense bill must show the exact rates assessed and the total charges due with the nature and amount of each charge, along with origin, destination, package count, freight description, weight or volume, the route and participating carriers, and the remittance address. A fuel line with no percentage and no stated base is thin against that standard, and asking for the nature and amount of each charge is a request with a rule behind it rather than a favor.
Truckload works differently, and that matters
Do not carry the LTL logic onto a truckload bill. A per-mile truckload surcharge is computed as (index minus peg) divided by assumed MPG, times billed miles, which is the standard truckload fuel surcharge calculation. Nothing in that formula touches an accessorial. Miles are miles.
So on a per-mile truckload contract, fuel on an accessorial should not appear at all, and if it does, ask what mechanism produced it. Two legitimate explanations exist. The first is a stop-off charge or out-of-route mileage that genuinely added miles, in which case the fuel is on the miles, not on the charge. The second is a contract that bills truckload fuel as a percentage of linehaul rather than per mile, which some carriers and many brokers do. That is a different mechanism with the same base question underneath it.
The three things to establish, in order: is the surcharge per mile or percentage based, what is the stated base if it is percentage based, and does the invoice arithmetic match. Most fuel surcharge disputes end at one of those three.
Which accessorials could defensibly carry fuel
There is no federal rule assigning fuel surcharge to specific charge types. This is entirely tariff language. That said, some accessorials are fuel consuming and some are not, and that distinction is the argument you make when the tariff is ambiguous.
| Accessorial | Does the service burn fuel? | The reasonable position |
|---|---|---|
| Additional stop-off | Yes, it adds miles and idle time | Fuel on the added miles is defensible; fuel on the flat stop fee is a separate question |
| Reconsignment or diversion | Yes, the truck goes somewhere else | Same treatment as a stop-off: fuel follows the miles |
| Detention | Partly, the engine may idle | Detention is a time charge, so a per-mile surcharge has nothing to attach to |
| Layover | Partly, for reefer and idling | Time charge again, and usually priced to include it |
| Liftgate | Negligible | A labor and equipment charge, no linehaul component |
| Inside delivery | Negligible | Labor charge |
| Residential or limited access delivery | Marginal | Priced for access difficulty, not fuel |
| Lumper, sort and segregate, driver assist | No | Pure labor, often a pass-through reimbursement |
| Reweigh, reclassification | No | Administrative |
| Storage | No | Warehousing, not transportation |
Read that table as a set of arguments, not a set of rules. The practitioner taxonomy of common accessorial charges lists fuel surcharge itself alongside liftgate, lumper, residential, limited access, detention, storage and the rest, which tells you something useful: in ordinary industry usage the fuel surcharge is a peer of these charges, not a multiplier on top of them. That is a fair thing to say in a dispute letter when the tariff is silent.
The clearest cases are the ones at the bottom of the table. A lumper reimbursement is money you handed a third party to unload a trailer. Charging a fuel percentage on a reimbursement is difficult to justify on any theory, and it is worth flagging even when the dollars are small, because it signals the base setting is wrong across the board.
The stacking problem: fuel on a charge that should not exist
Here is the part that turns a small finding into a real one. When a fuel percentage applies to accessorials, every wrongly billed accessorial gets multiplied.
Say a liftgate is billed on a dock-to-dock load, which is one of the easiest accessorial overcharges to disprove. At $85 that is a small annoyance. At a 40 percent fuel surcharge applied to the accessorial base, the load actually carries $119 of charge that should not be there. The fuel is not a separate error; it is the same error, amplified.
This changes how you write the dispute. Do not ask for the liftgate to be removed and leave it there. Ask for the liftgate to be removed and the fuel surcharge to be recomputed on the corrected base, and state the resulting figure. Carriers issuing a corrected invoice will frequently back out the accessorial and leave the fuel line untouched, because the fuel line was calculated by a different system than the one the credit memo runs through. That is a process artifact, not bad faith, and you fix it by naming the recomputed number in your letter so the correction has a target.
The same applies in reverse when you are checking a corrected bill you already asked for. Redo the division. If $390.80 became $356.80 when $85 came off, the carrier removed the liftgate but recomputed fuel on a base that still contains the residential charge, which may or may not be what the tariff says.
Order of operations, the other half of the base question
Whether fuel touches accessorials is one question about the base. Whether fuel applies before or after your discount is the other, and the two combine.
An LTL invoice typically starts from a gross linehaul, applies a negotiated discount, then applies fuel. Applying fuel to the gross linehaul instead of the discounted linehaul produces a materially larger number on exactly the shippers with the deepest discounts. The full sequencing question, and what each ordering does to the total, is worked through in the order of operations on a freight invoice.
Combine the two questions and there are four possible bases on the same shipment:
- Discounted linehaul only.
- Gross linehaul only.
- Discounted linehaul plus accessorials.
- Gross linehaul plus accessorials.
On the illustrative invoice above, assuming a 60 percent discount off a $2,125 gross, base 1 gives $340.00 of fuel and base 4 gives $1,206.80. That spread is the difference between two entirely different pricing agreements, and your contract almost certainly does not state which one it intends.
What to put in the contract next time
The invoice-level fix recovers dollars on bills you already have. The contract fix stops the whole category. Three sentences do it.
- Name the base. “The fuel surcharge applies to the linehaul charge after all applicable discounts and applies to no other charge.” If the carrier wants accessorials included, make them enumerate which ones by charge code.
- Name the mechanism. Per mile with a stated peg and MPG, or a percentage keyed to a published bracket table. Not “per carrier’s published fuel surcharge.”
- Name the index and the week. The EIA Weekly Retail On-Highway Diesel Price series, specified as national or a named PADD, with the effective-week rule stated in plain terms.
Those are three of the levers that are genuinely open to you, and there are more of them than most shippers assume. Which parts of a fuel surcharge you can actually move at the table is covered in what is actually negotiable in a fuel surcharge.
The dispute, in three sentences
Fuel surcharge disputes settle faster than nearly any other billing dispute, because there is no judgment call in them. The arithmetic either reproduces the invoiced number or it does not. Keep the letter to the arithmetic.
Subject: Invoice 48213 - fuel surcharge base, request for correction
Hello,
On invoice 48213 the fuel surcharge is billed at 40.0% and $390.80.
$390.80 / 0.40 = $977.00, which equals the linehaul of $850.00 plus the
liftgate of $85.00 plus the residential charge of $42.00. Applied to the
linehaul alone, the surcharge is $340.00.
Please confirm the tariff item number and effective version that defines
the fuel surcharge base as including accessorial charges. If the base is
the linehaul charge, please issue a corrected invoice showing a fuel
surcharge of $340.00.
We are releasing the undisputed balance of $1,317.00 for payment today
and are contesting this line within the window preserved under
49 U.S.C. 13710.Release the undisputed balance. It keeps the relationship intact, removes any past-due leverage, and makes the dispute about one number instead of about whether you pay. And watch the clock: under 49 U.S.C. 13710 a shipper must contest a bill within 180 days of receipt to preserve its right to challenge, and the carrier has its own 180-day window for billing charges beyond what it originally billed. If you already paid, this is an overcharge claim rather than a dispute, and under 49 CFR 378.8 the processing carrier must pay, decline, or settle a written overcharge claim within 60 days of receipt absent a written extension. Every one of these clocks is laid out in the freight billing deadline reference.
The checklist
Run this once per carrier, not once per invoice. The base is a setting.
- Pull three to five recent invoices from the same carrier that carry at least one accessorial line.
- Divide the fuel surcharge dollars by the fuel surcharge percentage. Write down the quotient.
- Compare the quotient to the linehaul, to the discounted linehaul, and to linehaul plus each accessorial line. Identify which sum it matches.
- If it matches anything other than the linehaul figure your contract intends, ask for the tariff item number and effective version that defines the base.
- Read that item. Tariff language on the fuel base is usually one or two sentences and it is usually clear once you have it in front of you.
- Separately, check whether the fuel percentage itself is the right one for the week, because a wrong base and a wrong week are independent errors that can offset each other and hide both.
- When you dispute an accessorial, always state the recomputed fuel figure in the same letter.
- At renewal, write the base into the agreement in one sentence.
Step six is the one people skip. An invoice where the carrier used a stale bracket and a too-wide base can come out close to correct by accident, and you will approve it. Recompute both inputs separately or you are checking a total against a total, which is not an audit.
Sources
- 49 CFR 373.103, Freight or expense bills (Cornell LII: a freight bill must show the exact rates assessed and the total charges due with the nature and amount of each charge)
- 49 U.S.C. 13710, Information and records, billing and contesting windows (Cornell LII: 180-day windows for additional billing and for contesting)
- 49 CFR 378.8, Overcharge claim resolution (Cornell LII: 60 days to pay, decline, or settle a written overcharge claim)
- EIA, On-Highway Diesel Fuel Price Survey procedures and methodology (the published weekly index every fuel surcharge mechanism keys to)
- Top 20 accessorial charges, practitioner taxonomy (Zipline Logistics: fuel surcharge listed as a peer accessorial alongside liftgate, lumper, residential, limited access, detention and storage)
- FreightWaves, Fuel surcharges in trucking (trade-press explainer on how surcharges are set and applied)