# SKU level landed cost allocation: choosing a method and sticking to it | LandedSight

Source: https://landedsight.com/blog/2026-10-21-sku-level-landed-cost-allocation-methods/

Cross-border operations guide · October 21, 2026


Freight, duty, and port charges arrive per shipment, but decisions get made per SKU. Allocating shared costs down to the item level is a method choice with real consequences for which products look profitable. This guide compares the main allocation bases and how to pick.

## What each allocation base does to your products

Allocating freight by weight loads heavy, cheap goods and flatters light, expensive ones. By volume, bulky light goods carry their fair share of a container they genuinely fill. By value, freight behaves like a tax on premium products, which can badly misstate the economics of a light, costly item that took almost no space. Units, the simplest base, treats a bolt and a bookcase as equals, which they are not in any cost that matters.

Duty should never be allocated by a proxy at all where rates differ, because duty is traceable: each line's rate and value are on the entry. Allocating actual duty per line is more work than spreading it, and it is the only version that survives scrutiny from finance or customs.

## Match the base to the cost's real driver

The defensible principle is that each cost follows its driver. Ocean freight follows volume or weight, whichever constrained the container, and most importers use the greater logic their carrier charges by. Air freight follows chargeable weight. Port and brokerage fees, which are per shipment or per line, follow lines or units. Insurance follows value, because that is how it is charged.

Mixed shipments make this a system task rather than a spreadsheet habit. The allocation rules should live in the costing system with the drivers captured at receiving: weight and cube per SKU are master data worth maintaining precisely because allocation depends on them every single shipment.

## Consistency matters more than perfection

Any reasonable method, applied consistently, produces comparable numbers over time, which is what decisions actually need. Switching methods between quarters manufactures margin trends that never happened and sends buying teams chasing ghosts. Document the method, version it when it changes, and restate history if a change is material.

Sensitivity check the big calls. For products near a pricing or delisting decision, run the allocation two ways and see whether the decision flips. If it flips, the honest answer is that the product's margin is method dependent, and the decision should be made knowing that rather than trusting one base blindly.

## From allocation to action

Allocated costs earn their keep when they change behaviour: a bulky low value line whose true freight share kills its margin gets repacked, repriced, or dropped; a supplier whose packing wastes cube gets a packing specification. Allocation that never reaches a decision is bookkeeping, and bookkeeping alone does not need this much care.

Review allocations when the freight market moves. In high rate periods, allocation choices swing product margins enough to matter strategically; in cheap periods the same choices are rounding. The method stays constant, but the attention it deserves should follow the money.

Keep reading: [Landed cost data quality: fixing the supplier invoice errors that poison your numbers](https://landedsight.com/blog/2026-10-21-landed-cost-data-quality-supplier-invoices), [How can landed cost data improve your next Incoterms negotiation with suppliers?](https://landedsight.com/blog/2026-10-21-incoterms-negotiation-landed-cost-data), and [How do you benchmark your landed cost against the market without competitor data?](https://landedsight.com/blog/2026-10-21-benchmark-landed-cost-competitors) cover the nearby cases in this series.

## Frequently asked questions

## Why allocate landed costs to SKU level at all?

Because decisions are made per product: pricing, reordering, delisting, and supplier negotiations all need a unit cost. Shipment level costs cannot answer those questions until shared charges are spread to SKUs by a stated method.

## What is the best base for allocating ocean freight?

The driver that constrained the container, usually volume for light bulky goods and weight for dense goods, mirroring how carriers charge. Allocating by value is the commonest mistake, since it loads premium light products with freight they did not cause.

## Should duty be allocated by weight or value?

Neither, where rates differ by line. Duty is traceable to each entry line's classification and value, so it should be assigned directly per line. Proxy allocation misstates duty for mixed rate shipments and will not match the entry.

## What matters more, the perfect method or a consistent one?

Consistency. A reasonable method applied the same way every period produces comparable margins that decisions can rely on. Changing methods creates artificial trends. For borderline decisions, test the product under two methods and say if the answer depends on the choice.