Freight audit and payment (FAP) is the process of checking every carrier invoice against the agreed rate, the shipment record, and the accessorials that were actually earned — then paying the corrected amount and capturing the data. Industry practice puts invoice error rates in the range of 5–10% of freight bills, and most of those errors favor the carrier, so auditing typically pays for itself many times over.
What the audit actually checks
Pre-audit
Before payment, each invoice is matched against three things: the contracted rate for that lane and service, the shipment record showing what actually moved, and the documentation supporting any accessorial. Discrepancies are flagged and either corrected or disputed before money leaves.
Post-audit
A retrospective review of bills already paid, usually going back months. Post-audit catches systemic issues — a fuel table that was never updated, a discount that stopped applying — and recovers overpayments. It is a second net, not a substitute for pre-audit.
Where the errors live
- Rate mismatch. The invoice does not use the contracted rate for that lane, weight break, or service level.
- Weight and class errors. LTL reclassification is the single most common source of unexpected charges. If your bill of lading class is wrong, the carrier reweighs and rebills — see freight class and NMFC and dimensional weight.
- Unsupported accessorials. Liftgate, inside delivery, residential, redelivery, detention — all legitimate when earned, all frequently billed when not. Review accessorial charges line by line.
- Fuel surcharge miscalculation. The surcharge should track the published index at the correct week. Fuel surcharge mechanics are a common quiet leak.
- Duplicate invoices. Same PRO number billed twice, often weeks apart under slightly different references.
- Detention and lumper charges without supporting timestamps or receipts. See lumper fees.
The data is worth more than the recovery
Most companies buy freight audit for the savings and end up valuing the data more. A clean, normalized freight payment dataset answers questions the operating side cannot otherwise answer:
- Cost per pound, per mile, and per shipment by lane and by carrier
- Accessorial spend as a percentage of linehaul — a direct measure of how well your network is executing
- Which facilities generate the most detention, and therefore where dock capacity is short
- Carrier performance against contract, with money attached to the comparison
- Accrual accuracy for finance, instead of guessing at in-transit liability
Accessorials are the tell. When accessorial spend runs high as a share of linehaul, the problem is usually operational — bad addresses, missed appointments, poor packaging — not carrier pricing. Fixing the operation removes the charge permanently, which beats disputing it monthly.
In-house, outsourced, or software
In-house makes sense at low volume or with a small, stable carrier base. It costs staff time and depends on someone maintaining rate tables carefully.
Outsourced FAP providers handle audit, payment, and reporting, typically priced per invoice or as a share of savings. They bring rate expertise and carrier relationships, at the cost of putting a third party between you and your carriers.
Software automates matching against rates loaded into a TMS, keeping the process in-house while removing the manual comparison work. This is the most common path for mid-size shippers.
Whichever route, a written dispute process matters more than the tool. Define who files disputes, on what timeline, and what evidence is required. Carrier dispute windows are finite — often 180 days or less — and an unfiled dispute is a permanent loss. For damage rather than billing issues, see how to file a freight claim.
Fewer parties, fewer surprises
A meaningful share of billing disputes come from brokered freight, where the party that quoted the load is not the party that moved it and accessorials get added downstream. Asset-based carriers invoice from their own dispatch and gate records, which shortens the audit trail considerably.
Go Freight is an asset-based Miami 3PL founded in 2004, with 100+ owned trucks, an owned chassis pool, and a 104,000 sq ft bonded warehouse at 6901 NW 26 Ave. We quote drayage, LTL, and warehousing with accessorials disclosed up front.
Frequently asked questions
What percentage of freight invoices contain errors?
Commonly cited industry figures put the error rate in the 5–10% range of freight bills, with the majority favoring the carrier. Rates vary widely by mode and carrier base — LTL, with its reclassification and accessorial complexity, tends to run higher than contracted truckload.
What is the difference between pre-audit and post-audit?
Pre-audit checks invoices before payment and prevents overpayment. Post-audit reviews already-paid invoices and recovers money after the fact. Pre-audit is far more efficient because recovery is slow and some claims expire, but post-audit catches systemic errors that pre-audit rules missed.
How long do I have to dispute a freight invoice?
It depends on the carrier’s tariff and your contract, but windows are typically 180 days or less, and some are much shorter. Because the clock runs from the invoice date rather than the discovery date, a slow audit cycle can silently forfeit valid claims.
Get freight pricing you do not have to audit
Asset-based Miami drayage, LTL, and warehousing with accessorials disclosed up front. Request a quote or call (786) 445-0150.