COGS & Landed Cost: Why They Make or Break Margin
Ask a struggling seller what their product costs and they will quote the price on the supplier's invoice. That number is a trap. The real cost of getting one unit onto Amazon's shelf — its landed cost — includes freight, duties, and a handful of charges the invoice never mentions. Confuse the two and your margin math is wrong from the very first calculation.
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COGS vs. landed cost: the crucial difference
Cost of goods sold, in its narrowest sense, is what you pay the factory per unit. Landed cost is everything it takes to land that unit at the fulfillment center, ready to sell. The manufacturing price is often the smallest surprise in that total — it is the freight, duties, and incidental fees that quietly inflate your real per-unit cost, sometimes by a third or more.
The components of landed cost
Build your landed cost from the ground up so nothing hides. Every one of these belongs in the number:
| Component | What it covers | Easy to overlook? |
|---|---|---|
| Unit manufacturing cost | Factory price per piece | No — it's on the invoice |
| Freight | Sea/air shipping to destination | Sometimes — varies per shipment |
| Duties & tariffs | Import taxes by product category | Yes — often forgotten |
| Customs & broker fees | Clearance and paperwork | Yes |
| Inspection / QC | Third-party quality checks | Yes |
| Prep & labeling | Getting units FBA-ready | Yes |
Turning a shipment total into a per-unit number
Landed cost only becomes useful when it is expressed per unit. The method is simple: add up every cost for the entire shipment, then divide by the number of sellable units it produced. Freight for a container, the duty on the whole order, the inspection fee — all of it gets spread across the units that actually arrive. That per-unit figure is the true COGS you plug into every margin and pricing decision.
Two suppliers can quote the same unit price and deliver wildly different landed costs. Freight and duties are where the real cost comparison happens — not the invoice.
Why small errors compound
Underestimate landed cost by even a dollar or two per unit and the damage multiplies across every sale, every reorder, and every pricing decision built on that faulty base. A product you believe carries a 30% margin might really be running at 18%. You would keep pouring cash and advertising into it, convinced it is a winner, while it slowly drains your business. Accurate landed cost is not accounting pedantry — it is the foundation everything else stands on.
Quick tip
Recalculate landed cost every time freight rates, tariffs, or order quantities shift. A number that was accurate last year can be badly wrong today, and stale COGS silently corrupts every downstream decision.
How landed cost shapes your other choices
Once you know your true per-unit cost, better decisions follow naturally:
- Pricing: your price floor is set by real landed cost, not the invoice price.
- Product selection: heavy or bulky items may look cheap until freight is added.
- Order quantity: larger orders often lower per-unit freight — a lever to weigh against cash flow.
- Supplier choice: a higher unit price with cheaper, faster shipping can win overall.
How order size changes your per-unit cost
Landed cost is not a fixed property of a product — it shifts with how much you order. Freight is the clearest example: shipping a full container spreads the transport cost across far more units than a small parcel shipment, dropping the per-unit freight sharply. Suppliers often lower the unit price at higher quantities too. This is why the same product can be marginal at a 200-unit test order and comfortably profitable at 2,000 units. The catch is cash: larger orders lower per-unit cost but tie up more capital and risk overstock, so the right quantity is a balance between landed-cost efficiency and cash-flow reality, not simply "order as much as possible."
Watch for tariff and freight swings
The two most volatile components of landed cost are the two sellers control least: duties and freight. Tariff rates can change with trade policy, and shipping costs swing with fuel prices, seasonal demand, and port conditions. A product that was comfortably profitable when you first sourced it can quietly slip underwater if a tariff rises or freight spikes and you never rerun the numbers. Treat landed cost as a living figure. Recheck it whenever conditions shift and before every reorder, so a change in the world does not silently turn a winner into a loser on your own shelf.
Keep it accurate with the right tools
Once you have calculated true landed cost per SKU, feed it into Helium 10's Profits tool so your reported margins reflect reality rather than the factory price. Combined with the platform's research tools during sourcing, you can estimate fees and shipping realistically before you ever place an order — catching an unprofitable product on the spreadsheet instead of after a costly shipment arrives.
Ready to put this into action?
Helium 10 gives you the tools in this guide in one dashboard. Start free through our link.