Shopify and Amazon Sellers: Your Fees Are Destroying Your Margin and You Do Not Know It

The margin illusion in online selling#

A product that sells on Amazon for £29.99 with a cost price of £12 appears to have a £17.99 gross margin — 60%. That number is almost meaningless. By the time you have subtracted Amazon's referral fee, FBA fulfilment, your advertising cost per unit, and your return rate, your real net margin might be £3.50 — 12%. AskBiz calculates this. For every product. With your actual fee structure and your actual return rate.

Connecting your Shopify or Amazon data to AskBiz#

AskBiz integrates with Shopify directly, so your sales data syncs automatically. For Amazon, you export your business report as a CSV and upload it. AskBiz then lets you ask: what is my net margin per ASIN after all fees? Which products are barely profitable or loss-making after fees? Which category has the worst fee-to-revenue ratio? These are questions that Amazon Seller Central and Shopify Analytics cannot answer — because they do not combine your sales, fees, returns, and costs in a single margin calculation.

Return rate analysis: the silent margin killer#

Returns are the most underanalysed margin destroyer in ecommerce. A product with a 20% return rate is not just losing 20% of its revenue — it is losing 20% of revenue plus the cost of processing the return, restocking or disposing of the item, and the advertising spend that generated the sale in the first place. AskBiz calculates the true cost of your return rate by product and tells you which items have an effective margin that accounts for returns.

Advertising cost per unit: connecting your PPC spend to your margin#

Most Amazon and Shopify sellers manage their advertising at the campaign level — ACoS, ROAS, cost per click. But the relevant metric for margin is advertising cost per unit sold. AskBiz connects your advertising spend data to your sales data and calculates: for each product, how much advertising did I spend per unit sold? What is my net margin after advertising costs? Which products have the highest advertising efficiency and should get more budget?

The 80/20 of your product range: where to focus#

Most online sellers have a product range where 20% of products generate 80% of the profit — and another segment that is actively loss-making but obscured by headline revenue numbers. AskBiz identifies this distribution for your specific business. Ask: which 20% of my products are generating the most profit? Which products are loss-making after all costs? If I discontinued my worst 10 products, what would happen to my overall margin? This analysis is often the most valuable thing an online seller can do.