The EZ-FreightAudit Guide: How to Stress Test Carrier Invoices
Carriers don't lose money by accident. Every un-audited invoice is a rounding error in their favor — and a systemic leak in your P&L. This is the playbook finance teams use to close that leakage with EZ-FreightAudit.
The "Stress Test" Concept
Spot-checking one invoice tells you nothing. Carriers price at scale, and their billing errors compound at scale. To find real money, you have to audit at scale too.
A Stress Test is simple: pull a 30-day payload of every LTL invoice you paid — not samples, not exceptions, the whole book. Then reconcile every single line against your signed Master Rate Contract. Not the sales quote. Not the pricing PDF from Q1. The actual, currently-in-force contract with its rate matrix, discount tiers, accessorial schedule, and fuel surcharge table.
The math is uncomfortable in the best way: mid-market shippers routinely find 3–8% of gross freight spend is systemic overcharge — not fraud, just entropy. On a $2M annual LTL spend, that's $60K–$160K sitting on the table every year, recoverable through formal dispute.
The Stress Test surfaces the pattern. Once you see the pattern, you file the disputes. Once you file the disputes, the pattern stops.
The Three Highest-Impact Leakage Points
Ninety percent of recoverable overcharges live in three failure modes. Address these first.
1. Unauthorized Accessorials
Where it hides: Residential Delivery, Liftgate, Inside Delivery, Limited Access, Notification/Appointment fees.
This is the #1 leakage vector — and the easiest to prove. Drivers and dispatchers make judgment calls in the field, then bill them as fact. A commercial park with a narrow driveway gets tagged "Limited Access." A warehouse with a functioning dock gets a "Liftgate" charge because the driver preferred to use one. A delivery to a business address gets flagged "Residential" because a house sits next door.
The audit move: Cross-reference every accessorial charge against the BOL, the delivery receipt, and — critically — the delivery address's actual USPS classification. If the address is coded commercial and the invoice bills residential, you have a documented misclassification. Dispute it with a screenshot; it's non-negotiable.
2. Dimensional Weight Mismatches
Where it hides: Post-audit reweighs, cube-to-density reclassifications, density minimums.
LTL carriers reweigh and re-dimension freight in-terminal — and they only ever reweigh up. Your BOL says 480 lbs Class 70. The carrier's post-audit invoice says 612 lbs Class 85. That single reclassification can shift a $340 invoice to $520 — a 53% overcharge, quietly billed 45 days after the shipment moved.
The audit move: Any invoice where billed weight exceeds BOL weight by more than the contractually-allowed variance (usually 5%) demands a Certificate of Corrected Weight (COCW) or a reweigh scale ticket from the carrier. If they can't produce one, the charge reverts to the BOL. Same rule for class changes — no NMFC documentation, no upcharge.
3. Fuel Surcharge Cap Violations
Where it hides: FSC percentage applied above contract ceiling, wrong index week, FSC on non-linehaul charges.
Your contract almost certainly caps the fuel surcharge — often at a hard percentage, or pegged to the DOE weekly diesel index with a defined lookback. Most carriers apply their tariff FSC table by default, which is higher than your negotiated ceiling. And a surprising number apply FSC to accessorial charges it was never contractually authorized on.
The audit move: Pull the DOE index for the shipment week, run it against your contract's FSC schedule, and compare to the billed rate. Then confirm FSC is applied only to the linehaul base — not to liftgate, not to inside delivery, not to notification fees. Delta = dispute.
The Audit Loop
Once you find the pattern, close the loop. A Stress Test isn't a one-time exercise — it's a monthly rhythm:
- Ingest — pull every carrier PDF invoice from the prior 30 days.
- Reconcile — line-by-line against the current signed Master Contract.
- Flag — every accessorial, weight, class, and FSC discrepancy over the contract variance threshold.
- Dispute — a formal, contract-cited dispute letter for every flag, filed within the carrier's claims window (typically 180 days).
- Track — recovered dollars, root-cause carrier, dispute cycle time. Then run it again next month.
Run Your First Stress Test — Free
Upload your 30-day payload of LTL invoices and your Master Contract into EZ-FreightAudit. In minutes you'll get a systemic overcharge report, flagged rows for every one of the three highest-impact leakage points, and carrier-ready dispute letters.
No credit card required. First audit is on the house.