Freight audit · Buyer guide

Freight Audit and Payment (FAP): What It Is and What to Ask

Published September 13, 2026 · Rob Eller

Freight audit and payment (FAP) is an outsourced service that receives your carrier invoices, checks them against your contract before they are paid, pays the carriers from money you provide, and codes the cost to your general ledger. It replaces the freight half of accounts payable. It is priced per invoice or as a share of spend, it holds your cash for some number of days between your funding and the carrier's deposit, and the audit inside it is a pre-audit that catches mechanical errors and passes interpretive ones. Those three facts decide whether it is worth buying and what the contract has to say.

What a freight audit and payment provider actually does

Strip the sales language away and an FAP engagement is six steps run on every invoice, every week.

1. Capture. Carrier invoices arrive as electronic data interchange (EDI) 210 transactions, the motor carrier invoice standard,, as files from the carrier's portal, or as paper and PDF that get keyed. Parcel invoices come as weekly files with hundreds of thousands of lines.
2. Match. Each invoice is matched to a shipment record: the bill of lading (BOL), the tender from your transportation management system (TMS), or the rated quote. No match, no payment, until someone resolves it.
3. Audit. The billed charges are compared to what the contract says they should be: base rate and discount, fuel surcharge for the week, accessorials, minimum charge. Variances above a tolerance are flagged. This is the pre-audit.
4. Exception handling. Flagged invoices go to a queue. Someone, at the provider or on your team, decides to pay, short-pay, or dispute. This queue is where FAP programs quietly fail: an exception that ages past the carrier's dispute window becomes a paid invoice.
5. Payment. The provider pays the carrier on the due date from funds you deposited or authorized. Some providers pay on your behalf from their own account and bill you; most require prefunding.
6. Allocation and reporting. Every charge is coded to your GL and cost centers, accruals are built for shipped-not-yet-invoiced freight, and you get dashboards of spend by carrier, lane, mode, and accessorial.

Steps 5 and 6 are the ones a pure audit firm does not do, and they are the reason FAP exists. For a shipper with 60,000 freight invoices a year and a three-person AP team, the value is not primarily the audit. It is not having to key, match, pay, and code 60,000 invoices.

How FAP providers charge

Pricing models are the first thing to compare and the easiest to be misled by, because the headline per-invoice fee is rarely the whole cost.

Fee component	Typical structure	Watch for
Transaction fee	Per invoice; commonly about $1 to $3 for freight, lower for parcel at volume. Or a percentage of spend, roughly 0.10 to 0.35 percent.	Tiering that resets monthly; paper or PDF invoices priced 2 to 4x the EDI rate; per-line pricing on parcel.
Implementation	One-time; carrier onboarding, rate loading, GL mapping.	Rate-table loading billed per carrier or per contract amendment, forever.
Monthly minimum	Floor on transaction fees regardless of volume.	A minimum set above your seasonal low quarter.
Float	Not on the invoice. Earned on your balance between funding and carrier payment.	A provider that will not state its funding-to-payment interval in days.
Post-audit recovery	Contingency on money recovered from paid invoices; 30 to 50 percent is typical industry-wide. Eller Audit charges 15 percent.	Contingency charged on pre-audit savings (money you never paid), which should be inside the transaction fee.

The one that gets missed on almost every evaluation is the last row. Money the pre-audit stops before payment is a cost avoidance, and you are already paying for it through the transaction fee. A provider that also takes 35 percent of it is charging twice for the same work.

The float question

This is the part of FAP that does not get discussed in the demo, and it is the part that decides whether the service is cheaper than it looks or more expensive.

Most providers require you to fund the account before they release payment. The mechanics vary: some debit you weekly for the invoices approved that week and pay carriers on each invoice's due date; some hold a standing balance sized to a few weeks of spend; some pay carriers from their own funds and bill you on terms. In every version there is an interval, measured in days, during which your money is sitting in someone else's account. On $40M of annual freight, a ten-day interval is roughly $1.1M sitting with the provider on any given day. At a 4 to 5 percent short-term rate, that balance earns the provider $45K to $55K a year, and it is not on any invoice you receive.

That is not necessarily wrong. It is one of the ways the transaction fee is kept low, and some of the largest FAP providers are banks or bank subsidiaries (Cass Information Systems is a bank holding company; U.S. Bank runs a freight payment business), which means the balance is held under banking regulation. Providers that are not banks hold your balance in their operating accounts unless the contract requires a segregated trust account. Shippers have paid the same freight bill twice after a payment provider failed with their funds inside it. It has happened more than once in this industry, and it will happen again to a shipper whose contract did not address it.

Four questions settle it. Is the balance held in a segregated account in your name or the provider's? Who earns the interest? How many days sit between your debit and the carrier's receipt? And what happens to in-flight funds if the provider becomes insolvent? A provider that answers all four in writing is one you can work with.

One more consequence of float, because it costs shippers more than the interest does: late payment forfeits your discount. Many less-than-truckload (LTL) tariffs and most negotiated agreements say that if an invoice is not paid within terms, commonly 30 days, the negotiated discount is void and the shipment re-rates at full tariff. A provider that stretches carrier payment to extend its own float can trip that clause on your behalf. Ask for the on-time payment rate by carrier, monthly, as a reported metric.

Worked example: $40M program, 60,000 invoices, $120K difference in who does the post-audit

A consumer-products manufacturer spends $40M a year on LTL, truckload, and parcel across 60,000 invoices. They move freight AP to a bundled FAP provider at $1.85 per invoice: $111,000 a year in transaction fees, plus a $25,000 implementation.

The provider's pre-audit does its job. In year one it rejects or short-pays 0.9 percent of billed spend, $360,000, before payment: duplicate invoices, base rates that do not match the loaded contract, fuel surcharge percentages one band off, accessorials with no BOL authorization flag. That money is never paid. It is a cost avoidance, and it is worth more than three times the transaction fee on its own.

In year two the shipper runs an independent post-audit on the invoices the provider approved and paid. The second look finds another 1.2 percent of spend, $480,000. None of it is mechanical. It is the interpretive layer the pre-audit rules cannot see: reclassifications billed without an inspection certificate, liftgate charges on deliveries to addresses with a dock, fuel keyed to invoice date instead of pickup date, and one carrier that had quietly moved to a newer tariff base while the loaded discount stayed the same.

Recovery on that $480,000 runs about 80 percent, so $384,000 comes back. The only variable left is the contingency fee:

• At the industry-typical 40 percent: fee $153,600, shipper nets $230,400.
• At Eller Audit's 15 percent: fee $57,600, shipper nets $326,400.

$96,000 of difference, on the same recovery, from the fee alone. Add the provider's proposal to take 35 percent of the pre-audit savings as well, which this one did, and the gap between the cheapest and the most expensive way to run the same program passes $200,000 a year.

Comparison: four ways to run freight AP

Model	Who holds the cash	Catches	Misses	Fee model	Best fit
In-house AP	You	Duplicates, obvious mismatches, if anyone checks	Almost everything contract-dependent	Headcount	Under ~5,000 invoices a year
Audit-only (contingency)	You	Interpretive and mechanical errors on paid invoices	Nothing pre-payment; no GL work	Share of recoveries	Any size; no switching cost
Bundled FAP	Provider	Mechanical errors before payment; all the AP labor	Interpretive errors; anything its rules were not written for	Per invoice or % of spend, plus float	20,000+ invoices a year, thin AP team
FAP plus independent post-audit	Provider	Both layers	Little, if the two are allowed to see each other's data	Transaction fee plus contingency on the second look	Any FAP program older than a year

What your FAP contract should say

Three clauses. They are short, providers rarely volunteer them, and every one of them has decided an argument we were part of.

Funds clause

“All Shipper funds held by Provider for carrier disbursement shall be maintained in a segregated trust account for the benefit of Shipper, shall not be commingled with Provider’s operating funds, and shall not be subject to the claims of Provider’s creditors. Provider shall disburse to carriers no later than [3] business days after Shipper funding and shall report on-time payment rate by carrier monthly.”

Data ownership clause

“All invoice, shipment, rate, and audit data processed under this Agreement is the property of Shipper. Provider shall furnish a complete export in a standard machine-readable format within ten (10) business days of request, during the term and for twelve (12) months after termination, at no charge.” Without this, your five years of freight history belongs to the vendor you are trying to leave.

Audit rights clause

“Nothing in this Agreement restricts Shipper from engaging a third party to audit invoices processed by Provider. Provider shall cooperate with such audit, including furnishing invoice images, audit logs, and exception dispositions, and no contingency or other fee shall be owed to Provider on recoveries obtained by such third party.” This is the clause that makes the second look possible, and the one most likely to be struck from a first draft.

What we can't tell from the dashboard alone

An FAP dashboard reports invoices processed, dollars audited, and “savings identified.” It does not usually show three things that matter more. First, the difference between flagged and disputed: an exception that sat in a queue and was paid at the carrier's number counts as processed. Second, the settle rate on disputes that were filed, which tells you whether the provider follows through or logs and moves on. Third, what the audit rules do not test for. A rule set is a list of things someone thought to write down, and the carrier's billing system is under no obligation to fail in only those ways.

To evaluate a provider you already have, the useful data is the exception log with dispositions, the dispute log with outcomes, and a sample of approved invoices to re-audit. To evaluate one you are considering, ask for the same three from a reference client.

How Eller Audit handles this

We do not pay carriers and we do not want to. We audit. That includes auditing behind an existing freight audit and payment provider: we take the invoices the provider approved and paid, re-run every line against the signed contract, the fuel index for the pickup week, the carrier's accessorial tariff in force, and the BOL, and recover what got through. The provider keeps doing the payment and allocation work it is good at. Findings come back with the contract clause, the math, and the dispute already drafted. Our share is 15 percent of what is recovered, nothing on lines that hold up, and the first audit is free so you can see what the second look finds before making any decision about the first.

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