Revenue is growing. A new record every month. Your webshop is running, your ads are paying off, your marketplace sales are rising. And yet, looking at the bank account at the end of the quarter, there is less left than expected. Much less.
It is the pattern most e-commerce businesses struggle with. With margins of 8 to 12%, every leak is critical. And more is leaking than most owners think. Not in one big place, but in three places that rarely show up in standard reporting, simply because they are not singled out there.
Leak 1: stock that does not move
Stock is a silent loss of money. Every euro tied up in products that do not sell is not working for you. And the problem is bigger than interest or storage costs alone. Slow stock also pushes your margin down, because sooner or later you have to mark down, clear out or write off to make room.
Most webshops measure stock turnover at total level: how many times does the whole inventory turn over per year? That says little. What you want to know is turnover per SKU and per category. Because in almost every webshop the 80/20 rule applies: 20% of SKUs deliver 80% of the profit, while the other 80% sits idle on the shelf.
What you see in the numbers when you look deeper: SKUs that turn over fewer than four times a year often have an actual margin, after correcting for storage, capital and markdowns, that is thirty to fifty percent lower than the gross margin suggests. Seasonal products not sold out before the season ends lose up to 40% of their value, a loss that is almost never fed into the next purchasing decision. And the actual cost of holding stock at most webshops is around 2 to 4% of stock value per month, usually unnamed in the figures.
Leak 2: returns that are not costed through
A return costs money. Everyone knows that. What not everyone knows is how much, and what the effect is on margin per category. Many webshops book return costs as operating costs at total level, without linking them back to the product or category they come from.
The effect: categories with high return rates, clothing, shoes, furniture, look profitable on paper, while after accounting for return costs they structurally sell below cost. A product with a 30% return rate, return costs of €12 per return and a gross margin of €15 per sale actually yields €11 instead of €15. A margin drop of almost a third.
What you want to see: the return rate per product category and per SKU, not just at shop level. All return costs: shipping, handling, inspection, repackaging, any markdown or write-off of the returned item. And the net margin after returns, next to the gross margin, per category. Only then do you know which products really earn something.
Leak 3: platform and fulfilment costs nobody adds up
The third big leak is a sum. All the costs you incur to get a product to the customer, which are rarely fully included in the product costing. Amazon referral fees, FBA costs, advertising ACoS, Bol.com commissions, payment provider fees, packaging, shipping. They pile up and eat into your actual margin per channel.
Most webshops know their channel margin at aggregate level, but not the net margin per channel after all costs. It then sometimes turns out that your Amazon revenue is loss-making, that your own webshop carries the entire company margin, and that for years you have been scaling the wrong channel.
A realistic channel costing includes: platform commission, fulfilment costs, return costs for that channel, advertising costs to be visible on that channel, plus the share of your overhead attributable to that channel. Only with that sum do you know where your margin actually comes from.
One data source, three analyses
At Strategie InZicht we link your webshop, ERP, accounts and marketplace data. In one overview you see margin per SKU, return impact per category and channel return after all costs, in real time, not only in the monthly report.
A short self-test
Three questions to answer for yourself. If you cannot answer one of them with a number, you know where your first profit leak is. What is the turnover of your ten slowest-moving SKUs, and how much working capital is tied up in them? What is your net margin per category after return costs, and does it differ by more than 10% from the gross margin? And what does your Amazon or Bol.com revenue yield after all platform costs and returns are deducted, compared with your own webshop?
Most e-commerce businesses that do this exercise discover that at least one of the three leaks depresses their margin by three to eight percentage points. On margins of around 10%, that is the difference between growing profitably and growing towards bankruptcy.
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