Maximum landed cost is the most a sellable unit can cost when it reaches the fulfillment location while still preserving the target profit.
Start with net selling revenue
Discounts reduce the amount available for fees, fulfillment, advertising, product cost, and profit. The calculation should begin with the realistic transaction price rather than the list price alone.
Reserve non-product costs first
Marketplace fees, fulfillment, expected returns, advertising, and desired profit all consume part of the selling price. What remains is the maximum landed-cost allowance.
Split the allowance
Landed cost can include supplier price, packaging, preparation, freight, insurance, duties, and inspection. If logistics estimates are already known, subtract them to find the maximum supplier price.
Use the result during supplier negotiation
A supplier quote below the maximum is not automatically good. Quality, compliance, MOQ, payment terms, and lead time still matter. The number is a boundary for further research.