Image: Free stacked shipping container image, licensed under CC0 1.0.
A demurrage invoice arrives for one container. Four importers have cargo inside it, each holding a house bill from the same consolidator, and the charge names a box number rather than any of them. Somebody now has to turn one container-level amount into four payable ones.
What usually happens is that the first party to receive a pass-through bill pays it whole, or the consolidator divides by the number of house bills, or the charge waits unallocated until the quarter closes. All three are guesses. The question has a defensible answer, and it arrives in two stages rather than one.
The charge is raised at box grain, the cargo lives at house grain
Everything the terminal and the ocean carrier do is priced per container. Free time runs on the box, demurrage accrues on the box, and the carrier's tariff knows a master bill and an equipment number. That is the full extent of its interest in who owns what is stacked inside.
LCL cargo is sold the other way round. The consolidator quotes each shipper on revenue ton, the greater of cubic metres and metric tons with one CBM treated as 1,000 kg, then issues a house bill covering that shipper's share. Four house bills, four revenue ton figures, one piece of equipment that none of them controls.
The volumes behind this are not shrinking. Freight News reported in April 2026 on a Global Growth Insights study putting the global LCL market at roughly $117 billion in 2025 and projecting $175 billion by 2034, a compound growth rate near 4.5 percent.
Neither are the amounts rounding errors. CMA CGM's United States demurrage tariff effective 22 February 2026 gives a 40-foot dry container four working free days at New York and New Jersey, then charges $370 per day for the first tier and $460 for the next, climbing to $710 per day from day thirty. MSC's schedule at Long Beach opens at $80 per day for five chargeable days before stepping to $150. Those figures were compiled by Tradlinx in July 2026 from the carriers' published schedules.
Nine chargeable days on one box at the New York and New Jersey rates, four at $370 and five at $460, comes to $3,780. Divided evenly across four house bills that is $945 each. Allocated on revenue ton, a shipper holding 3 of the container's 24 revenue tons carries $472. Most teams never establish which calculation produced the number they approved.
Three common methods, three different wrong answers
| Method | What it assumes | Where it fails |
|---|---|---|
| Whoever gets invoiced first | The named party is the liable party | The consolidator holds the container contract, so the name on the pass-through reflects billing order rather than liability |
| Equal shares per house bill | Each house bill consumed the same container | A one revenue ton shipment pays what a twenty revenue ton shipment pays |
| Revenue ton pro rata | The box is shared space and cost should follow occupancy | Charges every importer for days a single importer caused |
| Cause first, revenue ton on the remainder | Some days have an owner, the rest are genuinely shared | Needs event data the pass-through invoice does not carry |
One house bill can freeze all four
The reason causality has to come first is structural, and United States customs guidance states it outright. CBP's ACE guidance on ocean house bills says a hold on a house bill results in the master bill remaining on hold, and that the master is not released until a 1Z, which authorises all house bills, has been posted. The same guidance notes that a customs exam site cannot release cargo conditionally authorised under a 1X transfer unless all cargo in the shipment has a CBP authorised movement.
Read that operationally. One importer's late entry filing is four importers' demurrage. The three who cleared on day two are paying for the one who cleared on day nine, and nothing in the carrier's invoice records the difference.
The outer edge is set by 19 CFR 4.37. Unentered cargo may stay in the custody of the party that took it from the arriving carrier for 15 calendar days, after which the carrier or transferee must notify CBP and a port-certified bonded warehouse, and the general order warehouse has five calendar days from that notice to take possession. Storage from that point runs at the consignee's risk and expense. The consignee in question is one of four, and the box has been accruing against all of them since free time ran out.
Volumetric allocation of a shared container cost is not a novel idea either. The customs brokerage Shapiro, answering importers on consolidated examinations, describes cubic measurement being used to divide exam fees specifically where multiple shippers occupy one container, and notes that when an exam is required on a consolidation every shipment in the box is delayed. The trade already has a working convention for one container-level charge. It simply never generalised it to the rest.
The dispute window closes twice
Two regulatory clocks govern the pass-through, and consolidators commonly run only the first.
Under 46 CFR 541.7, an NVOCC's own 30-day invoicing window starts from the date of the invoice it received, not from the day the charge was last incurred. The same section recognises that an NVOCC is both a billed party and a billing party on a single charge, and provides that when its billed party disputes, the upstream billing party must grant the NVOCC an additional 30 calendar days to carry that dispute higher.
That right is real and it is perishable. It depends on the consolidator hearing your objection while the window is still open. An allocation question that first surfaces in a reconciliation spreadsheet six weeks after payment has already forfeited it.
46 CFR 541.6 then specifies what the invoice must contain, and one requirement points directly at co-loaded freight: the invoice has to state the basis for why the billed party is the proper party of interest and thus liable for the charge. A house bill number alone is not that basis. The rule also demands the allowed free time in days with its start and end dates, the container availability date on imports, and the specific dates charged. Under 46 CFR 541.5, omitting required information removes the obligation to pay. Section 541.4, which once defined who could be billed at all, now reads as reserved following the D.C. Circuit's vacatur, which leaves the proper-party statement in 541.6 as the main written check on billing the wrong party.
What Penny does with a co-loaded box
Penny separates the cost object from the payer, because on a shared container they are not the same thing. The container is what accrued. The house bill is what pays.
She rebuilds the day count from terminal and customs events rather than from the dates printed on the pass-through, then assigns every chargeable day a cause. A day the box sat because one house bill had no entry filed belongs to that house bill in full. A day driven by a terminal closure or a carrier hold belongs to nobody and comes off the charge entirely, which is the argument our post on demurrage causality makes for single-shipper boxes and which gets sharper when four parties are watching. Whatever remains genuinely shared is divided on the same revenue ton figure the freight was quoted on, so the allocation reconciles to the house bill instead of contradicting it.
Chase supplies the event trail the count is built from: discharge, availability, each house bill's release, gate out, empty return. Without it the attribution is opinion.
Where to start
Take the last ten co-loaded containers that produced a demurrage, detention or storage charge and answer three questions for each.
- Which house bill cleared last, and does the allocation you paid reflect that at all?
- Does the revenue ton figure used in the split match the one on the house bill you were quoted against?
- Does the invoice state a proper-party basis as 541.6 requires, or does it just carry a container number?
If the answers are no, unknown and no, you are not allocating a shared charge. You are absorbing someone else's delay at your own volume.
Book a walkthrough to see Penny allocate a co-loaded container against your own house bills.