Calculate landed cost: uncover your true per-unit margins
Quick answer: Landed cost is factory price plus freight surcharges, drayage and port fees, import duties, and 3PL prep and forwarding fees. Skip any of those, and a margin that looks healthy on paper can quietly disappear by the time a product actually reaches a customer.
You sourced a great product for $5 a unit. You sell it for $25. On paper, that's an 80% gross margin, the kind of number that makes a founder feel like they've found something special.
Then the accountant runs the end-of-quarter numbers, and the business is barely breaking even. That's the factory invoice trap. The price paid to the manufacturer is only the starting line, and by the time a product reaches a customer's hands, a handful of hidden logistics fees have already eaten most of that margin. Setting a retail price that actually builds wealth means calculating true landed cost first, not the factory quote alone. Here's what actually belongs in that number.
The hidden freight surcharges
Carriers rarely honor their base freight quotes, no matter how clean the original number looked.
Ship during Q3 or Q4, and ocean carriers add a Peak Season Surcharge. Fuel prices spike, and a Bunker Adjustment Factor gets tacked on too. Take the final, total freight invoice, every surcharge included, and divide it by total unit count. That's the real freight cost per unit, not the number quoted back in February.
Drayage, chassis, and port fees
Moving a container off the ship and onto land is its own expensive step, and it's easy to overlook until the bill shows up.
Drayage is what a trucker charges to haul a container from the ocean port to a local warehouse. Need a specialized trailer to move it, and there's a chassis split fee. Leave the container sitting on a backed-up dock too long, and demurrage penalties add up fast. These local fees alone can add hundreds of dollars to a single shipment, quietly raising cost per unit before the product's even left the port.
Customs, duties, and tariffs
Import duties aren't a flat tax. They vary depending on exactly how a product is classified under the Harmonized Tariff Schedule.
A small change in material can swing a duty rate from 5% to 25%, which is a big enough gap to make or break a margin on its own. Never guess this number. Find the exact HTS code, calculate the tariff off the commercial invoice value, and divide that total tax by unit count.
3PL prep and forwarding fees
Goods arriving at the warehouse isn't the end of the billing, even though it feels like it should be.
A floor-loaded container gets charged an hourly labor rate to unload. Wooden pallets cost extra. Forwarding to Amazon FBA adds a per-unit fee for FNSKU barcodes and carton labels. Every time a warehouse worker touches the product, landed cost climbs a little more.
Lock in your profit margins with A2Z Supply Chain
Tracking fluctuating tariffs and surprise port fees across every shipment is exhausting to do manually. A2Z Supply Chain builds that financial model directly.
Financial modeling: We calculate exact landed cost down to the unit, factoring in every touchpoint, so retail prices are set against real numbers.
Logistics: We negotiate all-inclusive ocean freight rates to shield against unexpected drayage and peak season surcharges.
Supplier coordination: We audit factory invoices to confirm goods are classified under the most favorable, legally accurate HTS codes.
Inventory planning: We optimize carton dimensions and pallet configurations to fit more units per container, driving down per-unit freight cost.
Round-the-clock support: Our ops pod works 24/7 on Slack to catch billing errors and dispute unfair carrier fees before they become your problem.
An 80% margin on paper and an 80% margin in the bank account are rarely the same number. The gap between them is almost always landed cost, hiding in plain sight.