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2026-05-10

Understanding E-Commerce Profit Margins: Where Your Money Really Goes

Most e-commerce sellers overestimate their margins. Here is how to calculate true profitability.

Revenue is vanity, profit is sanity. Many e-commerce sellers focus on top-line sales while their actual margins are paper thin. Here is how to calculate true profitability.

The Full Cost Stack

  • Product cost: Manufacturing or wholesale price
  • Shipping to warehouse: Freight, customs, duties
  • Platform fees: Amazon referral fee, FBA fees, or Shopify subscription
  • Advertising: PPC cost per unit sold
  • Returns: Return rate multiplied by cost per return
  • VAT: Do not forget this if you are VAT registered

Target Margins

After all costs, aim for at least 20 percent net margin. Below 15 percent, one bad month of PPC or a spike in returns can wipe out your profit entirely.

Where Margin Leaks

The three biggest margin killers are uncontrolled PPC spend, high return rates, and FBA long-term storage fees. Track each weekly.

Need a profitability audit? Get in touch for a free consultation.


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