What is a Freight Audit?

A freight audit is the process of reviewing and verifying freight bills from carriers before payment to ensure accuracy. Just like checking a vendor invoice against a purchase order, it involves confirming that shipping charges match the contracted rates, that accessorial fees (like fuel surcharges or liftgate fees) are valid, that weights and dimensions were billed correctly, and that there are no duplicate invoices. Because freight bills often contain errors, a freight audit helps prevent overpayment, ensures compliance with negotiated carrier contracts, and ultimately saves the company money by making sure accounts payable only pays what is truly owed.

How Freight Auditing Works

Freight auditing works by putting every freight bill through a review process before it’s paid. Here’s how it usually goes:

  1. Invoice Collection – Carriers (UPS, FedEx, trucking companies, etc.) send invoices, often electronically. These invoices can be ingested into a digital system for analysis.
  2. Data Capture – The invoice details (weight, distance, service type, charges, surcharges) are entered into a system. Additionally, technology has made it possible to use LLMs for data capture and sanitization.
  3. Validation – Each charge is checked against the company’s shipping contracts, rate agreements, and shipment data (for example: Did a 20-lb box get billed as 200 lbs? Was the right discount applied?).
  4. Error Detection – The system flags incorrect rates, duplicate bills, missing discounts, or invalid surcharges.
  5. Corrections/Disputes – Errors are either corrected in-house or disputed with the carrier so adjustments or credits can be issued.
  6. Approval & Payment – Once everything matches, the approved invoice is sent to Accounts Payable for payment.

Some companies do this manually, but most use specialized freight audit providers or software that automates the process and can handle large volumes of shipping invoices quickly.

Benefits of a Freight Audit

The benefits of freight auditing come down to saving money, improving accuracy, and gaining better control over shipping spend. Here are the key advantages:

  • Efficiency – Automated audits save accounts payable teams time by reducing manual checking and streamlining approvals.
  • Cost savings – Catching overcharges, duplicate invoices, or incorrect fees prevents unnecessary payments. Even a small percentage of errors can add up to big dollars.
  • Accuracy in A/P – Ensures every freight invoice matches the actual shipment and the contracted carrier rates, which keeps your books clean.
  • Dispute recovery – Overcharges can be flagged and sent back to carriers for credits or refunds instead of being written off.
  • Visibility into spend – Audit systems collect shipment data, helping the business analyze trends, negotiate better carrier contracts, and plan logistics more efficiently.
  • Fraud prevention – By reviewing every bill, you reduce the risk of paying fake or duplicate invoices.

What is a Freight Audit Bill

A freight audit bill is the reviewed and verified version of a carrier’s shipping invoice after it has gone through the freight auditing process. In other words, it’s the corrected bill that shows what the company actually owes for freight, not just what the carrier originally billed.

For example, a carrier might send an invoice showing $1,000 in charges. During the freight audit, errors could be found—maybe a duplicate fuel surcharge or a misapplied weight class—reducing the total to $900. The freight audit bill is that adjusted $900 amount, which then gets approved by accounts payable for payment.

Freight Audit Checklist

Invoice Details

  • Confirm carrier name and invoice number
  • Verify shipment date and tracking number
  • Check for duplicate invoices

Contract Rates

  • Validate freight charges against contracted rates
  • Confirm discounts have been applied correctly
  • Review fuel surcharge rates

Shipment Data

  • Verify shipment weight, dimensions, and freight class
  • Check origin and destination zip codes
  • Confirm service type (ground, express, LTL, FTL, etc.)

Accessorial Charges

  • Review liftgate, residential, inside delivery, or re-delivery fees
  • Validate detention, storage, or handling charges
  • Check if extra charges were pre-approved

Compliance & Documentation

  • Ensure Bill of Lading (BOL) matches invoice
  • Confirm proof of delivery (POD) is attached when required
  • Check for customs or import/export documentation charges

Final Approval

  • Record adjustments and savings for reporting
  • Validate corrected charges after disputes
  • Approve the final freight audit bill for payment

Freight Audit Cost

The cost of a freight audit depends on how it’s set up, but it usually works in one of two ways:

  1. Percentage of Savings – Many freight audit providers charge a contingency fee, often 25%–50% of the money they save you. For example, if they recover $10,000 in overcharges, their fee might be $3,000, and you keep the rest.
  2. Per-Transaction or Flat Fee – Some providers charge a set cost, such as $1–$5 per invoice audited, or a monthly flat fee that scales with your shipment volume.

For an in-house audit, the cost is mainly the time of your A/P or logistics staff plus any software you use, which could range from a few hundred dollars per month to enterprise systems costing thousands.

Freight Audit Process

The freight audit process is the step-by-step method companies use to check shipping bills before paying them. Here’s how it typically works, in simple terms:

  1. Receive Invoices – Carriers (like FedEx, UPS, or trucking companies) send freight invoices, either electronically or on paper.
  2. Collect Shipment Data – Details such as weight, dimensions, origin, destination, and service type are captured from shipping documents or internal systems.
  3. Match & Validate – Each invoice is compared against contracts, rate agreements, and shipment records to confirm charges are correct.
  4. Check for Errors – Look for overcharges, wrong weights or classes, missing discounts, duplicate invoices, or invalid accessorial fees (like fuel surcharges or liftgate charges).
  5. Dispute & Correct – If errors are found, they are either corrected in-house or disputed with the carrier to issue credits or adjustments.
  6. Approval – Once the charges are verified, the invoice is marked as correct.
  7. Payment – The corrected freight audit bill is then passed along to Accounts Payable for payment.
  8. Reporting – Savings, error trends, and shipping spend are recorded to help negotiate better carrier contracts and improve logistics decisions.