Landed Cost Without Surprises

The most dangerous number in eCommerce is a margin calculated from the supplier invoice. It looks precise, it goes into the pricing sheet, and it is wrong, sometimes by enough to make a best seller unprofitable without anyone noticing for a year.

Purchase price is what you pay the supplier. Landed cost is what the unit actually costs by the time it can be sold. The gap between the two is where margins quietly die.

The full stack of a unit cost

A real landed cost model accounts for every step between the factory and the sale:

• Purchase price, including the currency you actually settle in, at the rate you actually got
• Freight, allocated per unit honestly, sea versus air, full container versus LCL, plus the surcharges that appear on the final invoice but never in the quote
• Customs and duties, driven by classification, which is worth checking rather than inheriting
• Storage, because a slow mover consumes warehouse cost every month it waits
• Packaging, both product packaging and the shipping materials per order
• Fulfillment, pick, pack and outbound shipping, or your 3PL's full fee card
• Damage and loss, a real percentage in every operation, honest models include it
• Returns handling, where category return rates justify it

Where the surprises hide

In practice, the model breaks in predictable places. Freight allocated by unit count instead of volume or weight, which flatters bulky products. Exchange rates frozen at last year's planning rate. Duty rates copied from a similar product instead of the correct classification. Storage ignored entirely, which makes slow movers look innocent. And promotional purchasing evaluated at standard freight while the rush order actually flew air.

A useful discipline: every quarter, take your five best-selling and five worst-turning products and rebuild their landed cost from actual invoices, not planning assumptions. The gaps you find are your pricing and assortment homework.

What changes when the number is real

With true landed cost per SKU, several decisions sharpen at once. Pricing stops subsidizing heavy, slow, high-duty products with the margin of light, fast ones. Assortment reviews get honest, because a product's real contribution is visible. Sourcing comparisons become fair, since a cheaper factory with worse freight terms and longer lead times often loses on the full number. And promotions stop being celebrated on revenue while quietly losing money per unit.

The operator takeaway

Build the landed cost model once, wire it to actual invoices rather than assumptions, and refresh the allocations quarterly. It is unglamorous work that pays for itself the first time it stops you from scaling a product that was never profitable, or from killing one that actually was.

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