Five freight invoice errors clear routine review and get paid as billed: duplicate invoices, rate mismatches, accessorials without a matching record, weight and class discrepancies, and fuel surcharge errors. This article explains how each error happens, why record-setting diesel prices make fuel surcharge errors larger, and how Freight Audit & Pay (FA&P) catches all five.
Freight invoices pass review, payments go out on schedule, and the errors inside the line items rarely surface. Most of these errors involve no bad faith on either side. Freight billing runs on contracts, tariffs, accessorial schedules, and fuel tables that change constantly, and every handoff between them creates room for a charge that does not match your agreement. The cost builds through small, repeating differences spread across thousands of invoices. Here are five of the most common errors and how a Freight Audit & Pay process catches each one before payment.
Duplicate billing occurs when the same shipment is invoiced more than once. The copies rarely look identical: they carry different invoice numbers, arrive in different billing cycles, and sometimes come in different formats, all tied to one physical load. Fuel surcharges can duplicate the same way on multi-leg and interline moves, where more than one party bills fuel on the same miles. A reviewer working one invoice at a time has no reliable way to connect a charge in this week's batch to its twin from three weeks ago. FA&P matches charges at the shipment level across batches and carriers, so the repeat is flagged before either copy is paid.
|
Error |
How it happens |
How FA&P catches it |
|
Duplicate invoices |
The same shipment is billed more than once, under different invoice numbers, billing cycles, or formats |
Matches charges at the shipment level across batches and carriers |
|
Rate mismatches |
The carrier bills an outdated tariff, applies a default rate before a contract amendment is loaded, or uses a lane rate outside your agreement |
Validates every rate line against your current contract terms |
|
Accessorials without a matching record |
A fee such as liftgate, residential delivery, redelivery, or reweigh appears with no matching service event |
Confirms each accessorial against the shipment record |
|
Weight and class discrepancies |
The billed weight or LTL freight class does not match the documented shipment |
Compares billed weight and class to the shipment record and sends mismatches to review |
|
Fuel surcharge errors |
The surcharge uses the wrong index week, bracket, or fuel schedule, or applies fuel to ineligible accessorials |
Recalculates each surcharge against the correct index, effective date, step table, and eligible charges |
The rate you negotiated and the rate on the invoice do not always agree. A carrier may bill against an outdated tariff, apply a default rate before a contract amendment is loaded, or use a lane rate that was never part of your agreement. The gap is often a few percent, which is why it survives a quick scan. FA&P validates every rate line against your current contract terms, so each invoice is paid at the rate you agreed to.
Accessorial charges are legitimate when the service takes place, and they become an error when a charge appears with no matching service event. Common examples include liftgate charges on deliveries that did not need one, residential delivery fees applied to commercial addresses, redelivery charges for attempts that were never made, and reweigh fees that do not tie back to a documented reweigh. FA&P confirms each accessorial against the shipment record, so the fees you pay match the services you received.
Weight and freight class errors raise an invoice in two related ways. The billed weight may not match the shipment’s documented weight, or a less-than-truckload (LTL) shipment may be billed at the wrong freight class. Because class drives the base rate, a single classification change can move the entire charge, and any fuel surcharge calculated on the base rises with it. The error can start with the carrier's system or yours, so FA&P compares billed weight and class to the documented shipment and sends any mismatch to review to determine which record is wrong.
Fuel surcharges are formula-driven, so a single wrong input repeats across every shipment it touches, and each error’s cost rises with the price of diesel. The U.S. average retail diesel price reached $6.529 per gallon on Sept. 21, 2026, a record high that makes fuel a larger share of every freight invoice.
Fuel surcharge errors usually start in one of four places. The surcharge may be pegged to the wrong index week, earlier or later than the week the shipment picked up. The fuel percentage may be applied to accessorial charges such as liftgate or detention when your contract limits fuel to linehaul. The percentage may come from the wrong bracket of the contracted step table, or the calculation may rely on an expired fuel schedule.
Many invoice approval processes accept any charge that falls within a set tolerance of the expected amount. When fuel raises the total on every invoice, the same percentage tolerance absorbs a larger error per load, and that gap repeats across your freight volume before a spot check catches it. FA&P recalculates each surcharge against the correct index, effective date, step table, and eligible charges before the invoice is paid.
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Freight invoices should be audited both before and after payment. A pre-payment audit corrects billing errors, so the right amount goes out the first time. A post-payment review covers corrections, rebills, and credits that arrive later and pursues refunds before each dispute window closes.
Whether fuel surcharges apply to accessorial charges depends on your carrier contract. Some agreements limit fuel to linehaul charges, while others extend it to certain accessorials. An audit checks each invoice against the terms in your agreement, so fuel is billed only on the charges your contract includes.
Most freight fuel surcharges reset weekly against the U.S. Energy Information Administration (EIA) on-highway diesel average, published each Monday. The effective date for each new rate depends on your contract, which is why mismatched index weeks are a frequent fuel surcharge error.
Yes. The base price, the step table, and the charges fuel applies to are all parts of carrier negotiations. Negotiated fuel terms protect you only when invoices follow them, so auditing fuel surcharges matters most when diesel prices climb.