Gross Profit vs Net Profit for Ecommerce

Gross profit and net profit are both correct answers to “how much did we make”. They are answers to different questions, and most confusion about ecommerce profitability comes from someone using one where the other belongs.

What each one measures

Gross profit is net sales minus the cost of goods sold. It measures the relationship between what you buy something for and what you sell it for — nothing else.

It is the first thing to check on any store, because it sets a ceiling. A business at 22% gross margin has 22 cents per revenue dollar to cover every other cost that exists, and no amount of operational skill recovers from that.

Net profit is what remains once every other cost has been paid: fulfilment, payment fees, advertising, salaries, rent, software, professional fees. It measures whether the business as a whole works.

Between them sits everything that happens after you have bought the product and before the money is finally yours. For most stores that middle section is larger than the gross profit line makes it look.

Why gross margin flatters

Gross margin is the most quoted figure in ecommerce and the most flattering, for a structural reason: it excludes every cost that scales with selling, and includes only the cost of having.

A 62% gross margin sounds like a business keeping most of what it takes. In the example above it became a 6.5% net margin — the same month, the same orders, a factor of nearly ten between the two.

The costs that closed that gap were not exotic. Shipping, payment fees and packaging came to $22,300. Advertising came to $24,600. Fixed costs came to $15,300. Every one of them is ordinary, recurring and unavoidable, and none of them appears above the gross profit line.

This is why “we run a 60% margin business” tells a listener almost nothing about whether the business makes money.

The layers in between

There are two more numbers that neither gross nor net profit captures, and the first of them governs most day-to-day decisions.

Contribution margin is gross profit minus the variable costs of serving a specific order — shipping label, payment fees, packaging, fulfilment. It stops short of fixed costs and advertising.

The reason it matters is that it is the only honest ceiling on what you can pay to acquire a customer. Gross profit overstates that ceiling by whatever fulfilment costs. Net profit understates it, because it deducts rent and salaries that would have been paid whether or not the order existed.

A store that knows only gross and net profit ends up bidding against one of them, and both answers are wrong in a predictable direction.

Which number for which decision

• Should we raise prices, or renegotiate with a supplier? Gross profit. Nothing below the line is relevant.
• Can we afford free shipping over $50? Contribution margin. The change alters variable cost per order and touches nothing else.
• How much can we pay for a customer? Contribution margin per order, against acquisition cost.
• Can we hire? Can I take a salary? Net profit, over a quarter rather than a month.
• Is this product worth stocking? Contribution margin per unit, with shipping allocated by weight.

The pattern is consistent: the more specific the decision, the higher up the ladder the relevant number sits.

Margins as percentages, and their limits

Both figures are usually expressed as percentages of net sales, which makes months of different sizes comparable and is the right default.

The comparison to be careful with is against other businesses. Net margin especially is sensitive to things that have nothing to do with operating quality — price point, category, in-house versus outsourced fulfilment, whether the founder is on payroll, how stock is treated in the accounts. Two well-run stores can report margins several points apart on accounting convention alone.

Your own trend is the reliable signal. Gross margin falling while net margin holds means costs somewhere below the line are being cut to compensate, which works until it does not. Both falling together usually means acquisition cost has risen.

Where each number goes wrong

Both figures have a characteristic failure, and they are different failures.

Gross profit is usually overstated, because of missing costs rather than bad arithmetic. Any variant without a cost recorded is treated as pure margin. Landed costs — inbound freight, duty, customs handling — are frequently omitted, so imported goods look cheaper than they were. Bundles that carry no cost of their own report as one hundred percent margin, and bundles are typically the most promoted items in a catalogue.

Net profit is usually distorted by timing. Annual insurance premiums, a bulk stock purchase, a heavy advertising month before a launch — each lands in one month and swings the bottom line without anything having changed operationally. Meanwhile costs that belong to the period arrive late: carrier adjustments, disputes, refunds against earlier orders.

The practical consequence is that gross profit should be checked for completeness and net profit should be read over a quarter. Applying the opposite treatment — trusting gross margin blindly and reacting to a single month’s net profit — is how most stores end up simultaneously overconfident about their pricing and panicked about their overheads.

The quickest useful check

If you only look at two things, make them these.

Gross margin, monthly, as a percentage. It should be stable. Movement means supplier costs, discounting or product mix changed, and each has a different fix.

Net profit, quarterly, with your own salary included at market rate. Monthly net profit is too noisy — annual invoices and stock purchases swing it — and excluding founder compensation produces a figure that describes a business only viable while someone works for free.

Between those two, add contribution margin whenever the question involves spending money to get an order. That is the one that stops growth from quietly becoming expensive.