If a shipper approves an accessorial and the broker pays the carrier but never passes it through, the broker eats it. Accessorial pass-through between broker and shipper is a contract question, not a regulatory one, and there is no federal rule that turns a shipper’s verbal approval into a receivable. What makes the charge billable is a written pass-through term in your customer agreement plus a record of the approval. Without both, you paid a real charge and have nothing to invoice against.
That is the uncomfortable version, and it is the accurate one. Brokers lose more money to this than to carriers overbilling them, because it is silent. No dispute is filed. No exception report fires. The load simply settles at a lower margin than quoted, and the reason lives in an email thread nobody reconciles.
Why “the shipper approved it” is not “the shipper agreed to pay it”
These feel identical in the moment and they are not.
When a receiver keeps a truck four hours and your customer’s traffic manager says “yes, pay the detention, we know”, they are approving an operational decision. They are telling you not to hold the load hostage over a charge. Whether that charge lands on their invoice at cost, at cost plus a markup, or not at all is governed by whatever you both signed, not by that sentence.
Three things have to be true for an approved accessorial to become billable:
- Your customer agreement permits you to bill that charge type.
- The approval, or the condition triggering the charge, is documented.
- The charge actually reaches the customer invoice before your billing cycle closes.
Most brokerages are fine on point two and fail on points one and three. The agreement is silent on accessorials generally, and the charge arrives after the invoice went out.
The federal rules that apply here, and the ones that do not
This is where broker settlement discussions go wrong most often, so be exact.
Federal freight billing regulation is written for carriers. 49 CFR Part 377 applies to for-hire non-exempt motor carriers and household goods freight forwarders, and it governs credit terms and freight bill presentation, including the requirement in 49 CFR 377.205 that a carrier present its freight bill within 7 days of receiving the shipment on prepaid moves or 7 days from delivery on collect moves. That rule tells you nothing about when a broker has to invoice a shipper.
The billing and contesting windows in 49 U.S.C. 13710 are similarly carrier-facing: a carrier billing charges additional to those originally billed must do so within 180 days of the shipper’s receipt of the original bill to preserve its collection rights, and the billed party has 180 days from receipt to contest a bill and preserve its right to challenge. That is a genuinely useful clock on your buy side, because it bounds how late a carrier rebill can land on you. It is not a right to re-bill your own customer 180 days after the fact.
There is one statutory provision that speaks directly to who is on the hook for additional charges, and it is narrow. Under 49 U.S.C. 13706, a consignee acting as an agent that gives the carrier written notice of its agency status before delivery is liable only for the rates billed at delivery, with the beneficial owner liable for additional rates, and a consignee that misidentifies the beneficial owner stays liable. Useful to know when a receiver claims it is only an agent. Still not a pass-through right.
So: whether your customer owes you an accessorial is decided by your customer agreement. Say that plainly to your own team, because a settlement analyst who believes a regulation backs the pass-through will write a demand email that a shipper’s AP department will correctly ignore.
What a working pass-through clause actually says
A clause that says “accessorials will be billed as incurred” is not enough. It fails the first time a shipper asks what “incurred” means and whether they approved it.
| Element | What it has to specify | What goes wrong without it |
|---|---|---|
| Scope | Which charge types pass through by name | Layover, TONU and diversion turn out to be undefined |
| Basis | At cost, or cost plus a stated markup | Shipper assumes cost, you assumed margin |
| Approval | What counts as approval, and from whom | Verbal approval from someone without authority |
| Threshold | A dollar amount below which no approval is needed | Every $60 charge requires a phone call |
| Documentation | What you will provide with the invoice | Shipper withholds pending evidence you never collected |
| Timing | How long after delivery you may bill a late charge | Carrier rebills at day 90, you have no right to pass it on |
| Free time | Detention free hours, and when the clock starts | Buy-side and sell-side free time differ, you eat the gap |
The last row is the one that costs the most and gets the least attention. If your carrier rate confirmations give two hours free and your customer agreement gives three, the third hour is arithmetic you cannot audit your way out of, and it repeats on every detained load. Aligning the definition matters as much as the number, because what event starts the free-time clock is read differently by carriers, receivers and shippers as a matter of routine.
What counts as an approval record
Approval evidence has two jobs: proving the customer agreed, and proving the condition existed. Shippers contest both, usually in that order.
Written approval from a named person. An email or a message in the customer’s portal, with a timestamp, identifying the load and the charge. A note in your TMS that says “cust ok’d det” is an internal memo, not a record of the customer’s agreement.
Evidence the condition occurred. This is the same evidence you demanded from your carrier, which is the efficiency here: collect it once and it serves both sides of the load. For detention, that is arrival and departure timestamps tied to the shipment, and the documents that support a detention claim are exactly what your customer’s AP team will ask for. If the POD has no times, you are running a no-timestamp detention argument from the middle, owing the carrier and unable to substantiate to the shipper.
Evidence the charge was authorized on the buy side too. If the accessorial is not on the carrier rate confirmation and appeared for the first time on the carrier invoice, you may not owe it either. Check that before you pass it through. The two-document test in the liftgate fee on a dock-to-dock delivery is the fastest version of this check, and it applies to inside delivery, residential, and limited access equally.
Pass-through of a charge you should have disputed is worse than eating it, because you have now spent credibility with your customer defending a carrier’s billing error.
Cost versus cost plus markup
Decide this explicitly, in the agreement, per charge type.
Pure pass-through at cost is the norm for third-party outlays: lumper fees, tolls, permits. The customer expects to see the receipt and expects the number to match it. Marking these up quietly is how a relationship ends when someone compares your invoice to a lumper receipt.
Charges that reflect your own cost of service, detention you paid a carrier, layover, reconsignment miles, are more legitimately marked up, because you carried the cash and the risk. But only if the agreement says so. A markup discovered rather than agreed reads as a hidden fee even when it is defensible.
The safest posture is stating the basis per charge type in the agreement and then never deviating. Predictability is worth more than the incremental margin on any single accessorial.
Timing is what actually kills the pass-through
Most unbilled accessorials are not refused. They are never sent.
The sequence is ordinary. Load delivers Tuesday. You invoice the customer Thursday off the original tender. The carrier submits paperwork the following week and bills two hours of detention. Settlement pays it because it is documented and inside terms. Nobody re-opens the customer invoice, because re-opening a closed invoice is friction and the amount is small.
That is a process defect, not a judgment error, and it has two fixes.
Hold the customer invoice for an accessorial window. Pick a number of days after delivery, short, and do not invoice before it. Costs you a little DSO, catches most late accessorials before the invoice closes.
Or invoice immediately and run a supplemental cycle. Bill the linehaul on delivery, then run a weekly supplemental for accessorials that landed after. This needs a customer agreement term permitting supplemental invoices and a stated cutoff, or you will be arguing about it every month.
Either works. What does not work is invoicing on delivery with no supplemental process, which is the default at most brokerages and guarantees that every late accessorial is absorbed.
There is also a hard buy-side timing question underneath this. A carrier charge that arrives very late may not be one you owe at all. The relevant windows and how they interact are collected in the freight billing deadlines reference, and it is worth checking whether a late arrival is a legitimate rebill or a duplicate submitted under a new invoice number.
When you have already eaten it
Say the charge is paid, the customer invoice closed thirty days ago, and you found it in a margin review. Options, in order of how well they usually go.
Bill it with the evidence, on its own supplemental invoice, with a plain explanation. Reference the load, the approval, and the supporting document. Most customers pay a well-documented late accessorial once. The word “once” is doing work in that sentence.
Bundle it into the next contract conversation instead. If the amount is small and the relationship is not, converting a leak into a rate adjustment is often the better trade. This is the honest answer for a $75 charge on a customer doing forty loads a week.
Write it off and fix the clause. If the agreement does not permit the charge and the customer never approved it in writing, you do not have a receivable, you have a lesson. Book it and change the paperwork.
What you should not do is net it against an unrelated invoice or slip it into a linehaul rate. Both destroy the auditability your customer relies on, and a customer running their own freight audit will find it and treat it as a billing integrity problem rather than a margin recovery.
Where this fits with your carrier disputes
Keep the two sides separate in your queue even though they touch the same charge.
Your dispute with the carrier is about whether the charge was owed and documented, and it runs on the rules and contracts governing that relationship. Once you have paid, an overcharge you later identify runs on its own clock: under 49 CFR 378.8, the processing carrier must pay, decline to pay, or settle a written overcharge claim within 60 days of receipt absent a written agreement to extend, and under 49 CFR 378.9 a carrier that itself discovers an overpayment, duplicate payment, or overcollection must refund within 30 days.
Your conversation with the shipper is about whether the charge is billable under your agreement. Different question, different evidence standard, different timeline. Merging them produces the worst outcome available: paying a charge you could have disputed, then failing to bill a customer who would have paid it.
The checklist
Run this against your customer agreements, not against a single load.
- Does each customer agreement name the accessorial types that pass through, individually rather than as a category?
- Does it state cost versus cost plus markup, per type?
- Does it define what counts as approval, from whom, and above what dollar threshold?
- Does it list what documentation you will supply, so evidence expectations are set before the dispute?
- Do the free-time hours and the clock-start definition match your standard carrier rate confirmation terms?
- Is there a stated window for supplemental or late accessorial invoices?
- Does your billing process either hold the invoice for an accessorial window or run a supplemental cycle?
- Can you produce a report of loads where you paid an accessorial and billed none?
Item eight is the diagnostic that tells you how big this is for you, and it is the same asymmetry query at the center of carrier settlement reconciliation for 3PLs at scale and of the nine leak points in where broker margin leaks per load. Items one through six are the fix. Item seven is what stops the leak from re-opening next quarter.
Most of this is not a fight with anyone. Carriers bill accessorials they believe they earned, shippers approve charges they believe are operational decisions, and brokers pay them because holding freight over a small charge is bad business. The money disappears in the handoff between three parties who each behaved reasonably. That is a paperwork problem, which means it is fixable at the clause level and only there.
Sources
- 49 CFR Part 377, Payment of Transportation Charges (Cornell LII)
- 49 CFR 377.205, Presentation of freight bills (Cornell LII)
- 49 CFR 378.8, Overcharge claim resolution within 60 days (Cornell LII)
- 49 CFR 378.9, Carrier-discovered overpayments and duplicate payments (Cornell LII)
- 49 U.S.C. 13710, Billing and contesting windows (Cornell LII)
- 49 U.S.C. 13706, Liability of consignees for additional rates (Cornell LII)
- Top 20 accessorial charges, practitioner taxonomy (Zipline Logistics)