The costs that quietly eat a marketplace margin

Ask a seller for their costs and you will hear product cost, shipping, and commission. The margin gap at the end of the month is usually made of the ones they did not mention.

Packaging

A few rupees per order feels like a rounding error. It is charged on every order you ship, including every one that comes back, and it is never recovered. Across a month of a few thousand orders it becomes a real line item, and it is one of the few costs you control outright.

Damaged returns

The most under-modelled cost in marketplace selling. A returned unit that cannot be resold is not a shipping cost — it is the entire product cost, gone.

Sellers who track this properly are often surprised. A modest damage rate on returned goods, applied to a large return volume, writes off more value than the return shipping did. And unlike return rates, this one is mostly fixable with better outbound packaging.

Dead stock

Inventory that does not sell is capital you have already spent, sitting still. It does not appear on any per-order calculation, which is exactly why it gets forgotten. If you carry meaningful stock, a slow-moving SKU has a real holding cost even when it is technically an asset.

Your own time

Not a cash cost, but a real one. Photographing, listing, packing, answering queries, chasing claims. Sellers running thin margins on high volume sometimes discover the operation pays less per hour than the alternatives once time is counted honestly.

Claims you never filed

Parcels lost in transit, damaged in transit, or returned in a condition that warrants a claim. Every marketplace has a process, and every process has a deadline. Sellers who do not file promptly write off losses that were recoverable. This is money you have already earned.

Add them up before pricing

None of these are large individually, which is exactly why they are skipped. Together they are frequently the difference between the margin in the spreadsheet and the number in the bank. Price with them included and the forecast starts matching reality.

The profit calculator has explicit inputs for packaging and damage rate, and shows the damaged write-off as its own line so it is visible rather than buried in product cost.