LTL Freight Bill Audit: Reweighs, Reclassification and Accessorial Charges

Short answer: an LTL freight bill audit checks each less-than-truckload invoice against the bill of lading you tendered and the pricing agreement you negotiated. Overcharges on LTL freight invoices concentrate in five places: freight class reclassification, reweigh corrections, accessorial charges such as liftgate, residential and limited access delivery, fuel surcharge calculation, and discounts or minimum charges that do not match the contract. Disputes have deadlines, so the audit has to happen while the bill is still contestable.

Parcel invoices get audited because the refunds are easy: a package was late, the guarantee pays. LTL freight is harder, because the money is not in service failures. It is in the carrier's description of your shipment, which can differ from yours, and in charges added after pickup that nobody on the receiving end of the invoice is positioned to question.

How an LTL freight invoice is priced

An LTL rate starts from a base rate for the lane, the weight and the freight class, usually drawn from a base tariff your carrier or broker uses. Your negotiated discount comes off that base. Then an absolute minimum charge applies if the discounted result is too small, accessorial charges are added for anything beyond a standard dock-to-dock move, and a fuel surcharge is applied on top.

Every one of those inputs can change between the quote and the invoice. The class can be corrected, the weight can be corrected, accessorials can be added at delivery, and the fuel surcharge moves weekly. An LTL freight audit is the work of checking each input, not just the total.

Freight class and NMFC reclassification

Freight class is a rating from 50 to 500 under the National Motor Freight Classification (NMFC). A higher class means a higher rate for the same weight. Class depends on the commodity and, increasingly, on density: a 2025 overhaul of the NMFC moved a large share of commodities to density-based classification, which makes accurate dimensions on the bill of lading more important than they used to be.

When a carrier inspects a shipment and decides it belongs in a higher class, it reclassifies it and bills the difference. Sometimes it is right. Sometimes the inspection used the wrong commodity description, measured a pallet's overhang badly, or applied a class to a product that ships under a negotiated freight all kinds (FAK) class in your agreement.

Check FAK coverage first

Many shippers negotiate an FAK provision, which rates a range of classes as a single class. A reclassification that moves freight from one class to another inside your FAK range should not change the price at all. When it does, the invoice ignored the agreement, and that is the easiest LTL overcharge to recover.

Reweighs and inspection certificates

Carriers weigh freight in their terminals, and when the scale disagrees with your bill of lading, they bill the heavier weight. A reweigh correction should be supported by a weight and inspection certificate, a document recording the measured weight, the dimensions and often a photograph.

Ask for that certificate on every reweigh and every reclassification. Compare it with your own shipping records: the weight from your scale, the pallet count and the dimensions. Patterns matter more than single shipments. If the same product reweighs heavier on the same lane every week, either your scale needs calibrating or the correction deserves a challenge.

LTL accessorial charges to check

Accessorial charges cover anything beyond a standard pickup and delivery between two loading docks. They are legitimate when the service was needed and performed. They are also added at delivery by drivers and terminals, frequently without anyone at the shipper knowing until the invoice arrives.

• Liftgate service for a delivery location without a dock. Check whether the consignee actually lacks a dock.
• Residential delivery, sometimes applied to businesses operating from mixed-use or home-adjacent addresses.
• Limited access delivery, covering schools, construction sites, churches, military bases and similar locations. Definitions vary by carrier and are applied broadly.
• Inside delivery, for moving freight past the door. It should only appear when it was ordered.
• Delivery appointment and notify-before-delivery charges, which some consignees require and some carriers add by default.
• Detention, redelivery and storage, triggered by a consignee that was closed, unready or refused the freight. These belong to whoever caused the delay, which is often worth a conversation with the customer rather than the carrier.

The audit question for each one is simple: was this service requested, was it performed, and is it billed at the rate in your accessorial schedule rather than the carrier's general one?

Fuel surcharges, discounts and minimum charges

LTL fuel surcharges are usually a percentage of the linehaul charge, set by a table that moves with a published diesel price index, updated weekly. Two errors recur: the wrong week's index applied to a shipment, and the surcharge calculated on the gross charge rather than the discounted one. Both are small per bill and large across a year.

Then check the discount itself. Negotiated LTL discounts are lane, class or customer specific, and they expire or change when a pricing agreement is renewed. A bill rated at a lower discount than your agreement, or one that hits the absolute minimum charge when it should not, is a straightforward contract error. The way those rates drift between renewals is the same mechanic described in Vendor Fee Creep.

The 180-day window to dispute a freight bill

Federal law gives shippers a limited time to contest motor carrier charges. Under 49 U.S.C. 13710, a shipper that wants to contest charges originally billed, or additional charges billed later, generally must request a review within 180 days of receiving the bill. Loss and damage claims run on a separate clock, set by the carrier's terms within limits the law allows.

The practical consequence: an LTL freight audit done once a year, after the fact, has already lost every bill older than six months. Auditing has to keep pace with invoicing. That is the argument for continuous fee monitoring rather than an annual review.

How to run an LTL freight bill audit

Match each invoice to its bill of lading. Flag every bill where the class, weight or piece count differs from what was tendered, and request the inspection certificate for each. List every accessorial against what was ordered. Recalculate the discount and the fuel surcharge from your pricing agreement and the index for the ship week. Then group the differences by lane, carrier and consignee, because a pattern is a negotiation and a single bill is a claim.

Freight and small parcel costs are one of the categories AIME audits. It reads carrier invoices in any format, from 30 days to 36 months of history, benchmarks every line against your contracted rates and fair market rates, and flags erroneous surcharges and junk fees, with an AIME consultant supporting the carrier conversation. It works inside your existing carrier relationships, with no switching and no IT lift, and if nothing is found there is no fee. You can run an audit here.

Frequently asked questions

What is an LTL freight audit?

An LTL freight audit is a line-by-line review of less-than-truckload freight invoices against the bill of lading, the carrier's inspection records and the shipper's negotiated pricing, to find and recover billing errors such as incorrect class, weight, accessorials, discounts and fuel surcharges.

What is a reweigh fee on an LTL bill?

A reweigh correction is an adjustment the carrier bills when its terminal scale records a heavier weight than the bill of lading. Some carriers also charge a fee for the inspection itself. Ask for the weight and inspection certificate that supports it.

Can I dispute an LTL reclassification?

Yes. Request the inspection certificate, compare the commodity description, dimensions and density with your own records, and check whether your agreement includes an FAK provision that covers both classes. File the dispute within 180 days of receiving the bill.

How long do I have to dispute a freight bill?

For motor carrier charges, generally 180 days from receipt of the bill under 49 U.S.C. 13710. Your carrier agreement may set its own process, so read it alongside the statute.

Are LTL accessorial charges negotiable?

Yes. Accessorial schedules are part of most LTL pricing agreements, and shippers with regular volume often negotiate reduced or waived charges for services such as liftgate, residential and appointment delivery.