Why E-commerce Businesses Struggle with Profit (Even When Sales Are Growing)
Here's part 1 in our blog mini-series on E-Commerce!
For many e-commerce business owners, increasing sales is seen as the clearest sign that things are going well. More orders, higher revenue, and steady traffic all suggest the business is moving in the right direction.
However, it’s very common for e-commerce businesses to grow their revenue without seeing a proportional increase in profit. In some cases, profit can even decline as sales increase.
This usually comes down to the structure of costs within an e-commerce model.
Revenue Growth Doesn’t Always Equal Profit Growth
E-commerce businesses often operate on relatively thin margins once all costs are considered. While revenue may be increasing, a large portion of that income is consumed by:
• Advertising and marketing spend
• Platform and transaction fees
• Fulfilment and shipping costs
• Product sourcing or manufacturing costs
• Returns and refunds
If these costs rise at the same pace (or faster) than revenue, overall profitability can remain flat or decrease.
Advertising Costs Can Scale Quickly
Paid advertising is a key driver of growth for many e-commerce businesses, but it can also be one of the largest expenses.
As competition increases on platforms like social media and search engines, the cost of acquiring a customer can rise over time.
Example:
A business may spend £5,000 on ads to generate £20,000 in sales.
If ad costs increase to £8,000 to generate £30,000 in sales, revenue has grown—but the margin may not have improved significantly.
Without monitoring customer acquisition costs, it becomes difficult to understand whether marketing spend is actually profitable.
Returns and Refunds Reduce Overall Profit
Returns are a normal part of many e-commerce models, particularly in sectors such as fashion and retail.
However, high return rates can significantly impact profitability.
Each return may involve:
• Refunds issued to customers
• Reverse logistics costs
• Additional handling or restocking expenses
Even if a sale is initially profitable, a returned order can eliminate that profit entirely.
Discounting Can Impact Margins
Promotions and discounts are often used to drive sales volume, but frequent discounting can reduce the average margin per order.
Example:
If a product sells for £50 with a £30 cost, the gross profit is £20.
If a 20% discount is applied, the selling price drops to £40, reducing the gross profit to £10—cutting profitability in half for that sale.
While discounts can increase conversion rates, they need to be used carefully to avoid eroding margins.
Other Costs That Affect Profitability
In addition to advertising and discounts, several other factors can impact e-commerce profitability:
• Payment processing fees (e.g. Stripe, PayPal)
• Platform fees (e.g. Shopify subscriptions, marketplace commissions)
• Shipping and packaging costs
• Inventory storage or warehousing
• Currency conversion fees (for international sales)
Individually, these may seem small—but collectively, they can significantly reduce overall profit.
The Importance of Understanding Margins
A key challenge for e-commerce businesses is that revenue is highly visible, but profit requires a deeper level of analysis.
Two businesses with the same revenue can have very different outcomes depending on:
• Cost control
• Pricing strategy
• Operational efficiency
Without clear visibility of margins, it becomes difficult to determine whether growth is actually sustainable.
Final Thoughts
In e-commerce, growing revenue is important—but it is not enough on its own.
Sustainable success comes from understanding how revenue translates into profit, and how costs behave as the business scales.
Businesses that actively monitor margins, control costs, and evaluate performance at a deeper level are far better positioned to grow in a controlled and profitable way.
Set Yourself up for Success
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