Net margin. Your business's rescue or death.

MMost founders sell without knowing how much they actually earn.

I am not talking about revenue. I am talking about the money that remains after paying everything. Supplier, courier, returns, platform commission, payment processing, packaging. Everything.

Every time a founder tells me I have 40% margin, I know what is coming. We start breaking it down. We subtract real cost of goods. Subtract courier. Subtract returns. Subtract platform commission.

By the end it usually lands around 18 to 22%.

Nobody is lying on purpose. They have just never done the math properly. That is the real problem. Scaling decisions get made on a margin that does not exist. And the bank account pays the bill.

The typical case: the founder who thinks he has 38%

Picture a tech products store, smart founder, decent revenue. On the first call he says: my margin is 38%, I can scale aggressively.

The right answer: OK, open Excel and calculate step by step.

After 40 minutes, real margin can come out at 19%. Half. Usually silence follows.

Not because the founder is stupid. He simply had never counted the real cost of returns, special packaging, and the processing commission on international transactions.

This happens in most cases. The entrepreneur looks at sale price and purchase price and does the difference. I have 50% margin. But gross margin does not pay bills. Net margin does. And the gap between them is everything that matters.

The right formula

If you sell 10 products, variable costs multiply by 10. If you sell 100, they multiply by 100. That is the difference from fixed costs. Rent is the same whether you sell 1 or 1,000. But courier, packaging, goods, returns, platform commission, all grow proportionally with sales.

What must be included, no shortcuts

• Cost of goods. The real price you pay the supplier, plus transport to your warehouse. Not the catalog price. The final price, with everything added: transport, customs, taxes, insurance.
• Shipping to customer. If you offer free shipping, it still comes out of your pocket. You just bury it in margin. On large products, courier can cost EUR 8 to 16. On small ones, EUR 3 to 5. It counts.
• Packaging. Box, wrap, labels, protective material. Every order. On fragile products, packaging can cost EUR 2 to 3. On clothes, EUR 0.6 to 1. Not much per order, but at 500 orders a month it becomes EUR 300 to 500.
• Estimated returns. If you have a 5% return rate in that category, you add 5% to cost. Returned products either break or go into secondary stock at a discount. Every return costs you. It is not just the return courier. It is lost time, storage, repackaging, eventual discount on resale.
• Platform commission. On eMAG you can hit 15 to 20%. Amazon, 12 to 15%. Allegro depends on category. At EUR 20,000 sales on eMAG, commission can be EUR 3,000 to 4,000. If you do not put it in the calculation, your margin is 15 to 20 points higher than reality.
• Payment processing. Stripe, PayU, bank fees. Between 1.9% and 3% per transaction. At high volumes, that is thousands per month.
• Manual packing. If you employ someone to pack orders, their time counts. You split the cost across processed orders. If a person costs EUR 800 per month and packs 800 orders, each order costs EUR 1 from their salary.

Concrete example: the scooter

You sell an electric scooter at EUR 500. The founder says his margin is 56%. Here is what honest math looks like. It is exactly the model we put on the table on the first call with any store, before any budget.

43.4%, not 56%. The 12.6-point gap is EUR 63 per scooter. At 100 scooters a month, EUR 6,300 the founder thinks is allocated for ads. It is not anywhere.

That is why, when you scale on the wrong margin, the first two months seem to work. Month three's bank statement hands you the reality.

IN the individual product, AT the catalog level, ABOVE the business model

IN the individual product, net margin tells you whether that product deserves paid ad spend. Below 15%, it does not. Customer acquisition cost eats you alive.

AT the catalog level, the weighted average margin across all products tells you how aggressively you can scale. A store with 50 SKUs where half sit below 15% margin cannot scale the whole catalog. You scale the good half and cut the rest.

ABOVE everything, margin dictates the business model. Below 15% average margin, you do not have a business that scales on ads. You have two options: change suppliers or change prices. There is no third.

We got this wrong too. Early on we accepted a client's declared margin without verifying it ourselves. After two months of scaling, the real margin was about ten points lower. We lost time and we lost money. That is why we now open the spreadsheet on the first call and verify the margin line by line, before any campaign.

Scaling thresholds

Notice there is no it depends at the bottom threshold. Below 15% you do not scale, period. If you give 10% agency commission and 5% processing costs, you are left with zero. And that assumes ads work perfectly, which never happens.

How to grow margin without raising price

What good is traffic if every sale digs your grave?

1. 01Switch supplier or negotiate volume. Going from 100 to 1,000 units a month gets you 15 to 25% off. Concentrate orders on the few products that bring the profit and you get a supplier discount without raising the shelf price.
2. 02Optimize packaging. Smaller box means cheaper volumetric shipping. On bulky products, the difference can be 20 to 30% per order. I saw a case where switching from standard to custom box reduced shipping cost by EUR 2.4 per order. At 1,000 orders, EUR 2,400 saved. Without changing the price.
3. 03Reduce returns. Better photos, clearer specs, product video. Customers get what they expected. Return rate drops from 6 to 8% to 2 to 3%. Every return less is profit more.
4. 04Bundles. Sell two or three products together at a small discount. AOV rises, shipping cost splits across items, effective margin goes up. Example: you sell a hairbrush at EUR 10, margin 30%. You sell a set brush plus shampoo plus conditioner at EUR 24, effective margin 42% because shipping is the same.
5. 05Checkout upsell. Extended warranty, accessories, setup service. Margins there are 60 to 80%. Adds real profit with no extra marketing budget. A customer buying a scooter might buy a helmet too. Helmet margin is 65%. That is pure added margin.

The 30-minute exercise

Open Excel. Put every product on the site as a row. Seven cost columns, from the list above. Calculate real margin on each. Sort descending.

Within 30 minutes you will see something you have not seen before.

• Two or three products with margin above 40%. That is where the money is. Scale here. Put 80% of ad budget on them.
• Five to eight products at 20 to 35% margin. That is where you work on cost and bundle plays. Do not stop them, but do not scale them yet.
• Products below 15%. Remove from the catalog, or use them as loss-leaders for AOV, knowing you lose on them to win on the cart. But do not put them in paid campaigns. There you just burn money.

This exercise is the first thing we do with every new client. Before opening Meta Ads Manager. Before talking budget. Before anything. Because if we do not know margin, every budget decision is guesswork. You might win, or you might blow your account.

The Arges tourism case: how margin changed our entire strategy

The tourism client, the agency from Arges, had no website, no digital presence, no tracking. But they had something many do not: healthy net margin on group packages and retention above 85%.

We measured margin on each package type. Group packages had margin above 35%. Individual trips were under 12%.

The decision was clear. We concentrated all budget on group packages. We built dedicated landing pages, set up clean tracking, started Google campaigns.

In 12 months, 993 invoices and 1,700,657 lei. POAS 3.2x. From zero digital to the agency's most profitable channel.

Same lesson as with scooters. You do not scale everything. You scale what has margin. You measure first. You concentrate budget. The rest is math.