Freight Audit and Payment: How to Catch Billing Errors

What is freight audit and payment?

Freight audit and payment is the process of checking carrier invoices against contracted rates, shipment records, fuel tables, accessorial rules, and proof of delivery before approving payment. Field-level freight audit samples often find 2-6% invoice variance across LTL, parcel, and truckload spend, mostly from incorrect accessorials, duplicate invoices, and stale fuel surcharge tables.

Cost structure / standard tiers

Freight audit can be handled internally, by a 3PL, or by a specialized audit provider.

Audit Model	Typical Cost	Best Fit
Internal spreadsheet audit	Staff time	Low-volume lanes
TMS invoice matching	Included or $0.50-$2/invoice	Mid-volume shipper with clean data
Third-party audit provider	3-8% of recovered savings or fixed fee	High invoice volume
Post-payment recovery audit	Contingency share	Historical overcharge review

The savings depend less on the audit tool and more on whether shipment, contract, and invoice data are complete enough to match.

Risk mitigation / operational guidance

Audit accessorials separately from base freight because detention, reclass, residential, liftgate, and storage charges drive many invoice disputes. Keep current rate sheets, fuel surcharge tables, and carrier rules in one controlled folder. Require POD or event timestamps before approving detention or layover charges. Review duplicate invoice logic by carrier SCAC, PRO number, BOL, invoice number, and amount rather than a single field.