Free tool
Carrier AP overpayment calculator
Two numbers, one answer: what unaudited carrier invoices are costing you a year. Our planning figure puts accounts payable (AP) overpayment at 1-3% of carrier spend when invoices are paid as billed.
Loads per month
Average carrier cost per load (USD)
Want the overpayment found and fixed?
ClearLane audits every carrier invoice against the rate confirmation before payment goes out. Request a demo to see the process on your own freight.
What is AP overpayment?
AP overpayment is the gap between what carriers bill and what the rate confirmation says you owe. It comes from duplicate invoices, wrong fuel surcharge weeks, accessorials without documentation, and contract rates not applied. Each error is small. Across thousands of loads they compound into real money.
The math
Annual carrier spend x 1-3% = estimated overpayment. A brokerage moving 2,000 loads a month at a $1,000 average carrier cost spends $24M a year with carriers. At 1-3%, that is $240,000 to $720,000 paid out on invoices that did not match the paperwork.
Where freight AP leaks money
Four places, in order of frequency: duplicate billing (same load, two invoice numbers), fuel surcharge errors (wrong base or wrong week), accessorials billed without backup (detention with no in/out times, lumper with no receipt), and line-haul that does not match the rate confirmation. The freight invoice audit checklist covers all four.
What the calculator tells you that the invoice cannot
- Your annual carrier spend, which most operations underestimate.
- The realistic overpayment range hiding inside it at our 1-3% planning rate.
- Whether a dedicated audit step pays for itself at your volume.
Thirty seconds, two numbers, and you will know if unaudited AP is a rounding error or a budget line.
Related reading: what an outsourced AP audit actually covers and how contract rate discrepancies quietly eat margin.
Where carrier invoices go wrong
Four of these five show up on almost every unaudited invoice run. The third column is the check from our carrier invoice audit checklist that catches it.
| What goes wrong | Why it happens | The check that catches it |
|---|---|---|
| Duplicate billing | The same load invoiced twice under two invoice numbers, often after a re-send. | Duplicate check against invoice and load number |
| Fuel surcharge, wrong week | Surcharge tables move weekly and the invoice picks up a stale one. | Verify base, percentage and week |
| Undocumented accessorial | Detention or lumper billed with no in and out times and no receipt. | Detention and lumper checks |
| Contract rate not applied | Spot rate billed where a contract rate exists, or an amended rate confirmation ignored. | Match line-haul to the rate confirmation |
| Advance not deducted | A Comchek or fuel advance taken mid-load never comes off the final invoice. | Advances deducted check |
Where these figures come from
Published third-party estimates of freight billing error and overcharge rates vary widely, from low single digits to well above ten percent, because each study defines errors differently and samples a different slice of freight. There is no single authoritative number.
The 1 to 3 percent range used here is our own planning figure, and it sits deliberately at the conservative end. It describes money paid out on invoices that did not match the paperwork, not all invoices containing any discrepancy. The only number that matters for your operation is the one your own audit produces, which is what the invoice audit checklists and findings log are for.
Related tools and references
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Frequently asked questions
Where does the 1-3% overpayment range come from?
It is our own planning figure, set at the conservative end: when carrier invoices are paid as billed, the errors that slip through typically land between 1% and 3% of total carrier spend. High-volume operations with informal AP checks sit at the top of that range.
What are the most common carrier invoice errors?
Duplicate invoices, fuel surcharge calculated on the wrong week or base, accessorial charges without documentation (detention, lumper, layover), and line-haul that does not match the rate confirmation. None of them announce themselves. They only show up when someone matches the invoice to the paperwork.
Can I reduce overpayment without outsourcing the audit?
Yes, with discipline: a dedicated audit step before payment using the freight invoice audit checklist. The honest caveat is volume. Past roughly 1,000 loads a month, deadline pressure beats discipline, and that is when a dedicated audit desk, in-house or managed, earns its keep.