An ad valorem fee with a minimum and a maximum is three different fees depending on the entry value. Small formal entries pay the minimum, which can exceed the straight percentage several times over. Very large entries pay the maximum, which can be far below the percentage. Only the middle band pays the headline rate. A spreadsheet holding one percentage is correct by accident on a slice of your entries and wrong on both tails, systematically.
Consolidation strategy follows from the caps, which is why the fee deserves a buyer's attention rather than an accountant's shrug. Splitting one large shipment into several entries can multiply minimums and processing charges; consolidating small shipments into one entry can push the fee to its cap and stop it growing. Freight decisions made without the fee shape leave that money unexamined on every sailing.
Harbour maintenance funds port infrastructure, and it is assessed on cargo shipped through US ports. Air freight does not pay it. Models built when a product line shipped by sea often keep charging HMF after the line shifts to air for speed, quietly overstating landed cost and sometimes killing a product's apparent margin for a fee it never owed. The reverse error, dropping HMF from a sea model because a template came from an air product, understates every ocean entry.
Mode changes are the trigger for a fee review. Any time a product changes how it travels, ocean to air, air to ocean, direct to deconsolidated, the landed cost model's fee lines should be rebuilt from the entry type and mode, not inherited from the product's previous life. Templates are where fee errors go to live forever.
The entry summary states what was actually assessed: the MPF and HMF amounts sit on the 7501 and in ACE, in dollars, per entry. A quarterly reconciliation of a sample of entries, model fee versus assessed fee, takes an afternoon and catches every species of this error at once: wrong rate, missed cap, wrong mode, fee applied to a shipment type that was exempt. There is no cheaper audit in the entire landed cost system.
While you are in the file, reconcile the duty lines as well, because the same template inheritance that preserves a wrong fee preserves a stale Chapter 99 rate with far larger consequences. Fee errors are the smoke. The fire, when there is one, is a stack that changed while the model stood still.
Nobody wins a negotiation over 0.125 percent. The point of pricing MPF and HMF correctly is not the fees themselves, it is the discipline signal. A costing model that gets the small, checkable numbers right can be trusted with the large ones. A model wrong on the fees in a checkable direction is telling you, for free, how much to trust its duty stack.
Publish the fee assumptions inside the model: rate, cap basis, mode applicability, and the date last reconciled against live entries. The next person to inherit the spreadsheet, and there is always a next person, should be able to see what was assumed and when it was last true.
Keep reading: Returns freight in landed cost: the leg the model always forgets to charge, DAP in the landed cost model: the duties your customer pays still cost you.
MPF on formal entries is 0.3464 percent of the entered value, but with a minimum and a maximum charged per entry, adjusted periodically by CBP. Small entries effectively pay more than the percentage because of the minimum; very large entries pay less because of the cap. A flat percentage in a cost model is therefore wrong at both ends of your entry sizes.
No. HMF, at 0.125 percent of cargo value, is assessed on commercial cargo shipped through US ports, which means ocean freight. Air shipments do not owe it. Cost models that carry an HMF line over from a sea shipped product to an air shipped one overstate landed cost on every unit.
Reconcile against the entry summary. Form 7501 and ACE show the MPF and HMF actually assessed per entry, in dollars. Sample entries quarterly and compare model against assessment. That one check catches wrong rates, missed caps, and mode errors together, and it usually exposes stale duty assumptions hiding in the same template.
It can change it materially. Because MPF has a per entry minimum and maximum, splitting a shipment across entries can multiply minimum charges, while consolidating can push the fee to its cap and stop it scaling with value. Whether consolidation saves money overall depends on freight and handling too, but the fee effect should be in the calculation, not discovered afterwards.