Many new stores price from one number: supplier cost. That is the fastest way to misread profit. The real pricing floor is not COGS alone. It is COGS, packaging, warehousing, fulfillment, payment fees, platform fees, discounts, refunds, duties or tax boundaries, support, and ad payback combined into contribution profit. A product that looks like it has 60% gross margin can still lose money per order if several layers are missing.
This article does not give a fee table because platform plans, payment providers, rates, and markets change. Treat it as a pricing cost stack: where each cost comes from, what teams usually miss, and when to move into the Ecomwith pricing calculator for scenario testing. The goal is not one perfect price. It is knowing the floor you cannot sell below, the discount that destroys margin, and the ROAS your ads must clear.
Product cost is not the pricing floor
COGS is product cost, not order cost. Suppose a supplier charges $18 and you plan to sell at $49. The margin looks healthy. But add $5 for packaging and fulfillment, $3 for payment and platform fees, $6 average shipping subsidy, $5 discount, $3 refund loss, and $2 support and exceptions. Contribution profit can fall to roughly $7. That leaves very little room for paid acquisition.
Separate three profit layers. Product gross margin compares item revenue and COGS on a consistent basis. The pre-ad contribution in this example also deducts order-variable costs. Operating profit must account for advertising and applicable fixed expenses. An inventory deposit uses cash but is not automatically another current-period cost of goods sold; check inventory recognition and financing expenses separately under the applicable accounting framework. Protect contribution room and plan inventory cash without treating them as interchangeable.
Cost layers to include before setting price
The first layer is product and packaging: purchase price, samples, defects, packaging material, and inspection. The second is fulfillment: warehousing, pick-pack, domestic freight, international freight, exceptions, and reshipments. The third is transaction cost: payment fee, platform transaction fee, currency loss, refund processing, and dispute cost. The fourth is promotion: discount, gift, free shipping subsidy, affiliate commission, and creator samples.
The fifth layer is refund and support: return shipping, unsellable returns, support time, and chargeback risk. The sixth is ad payback: how much you can spend on a first order and how much repeat purchase, email, accessories, or subscription revenue is proven later. The seventh is cash timing: inventory deposits, ad prepay, payout delay, and supplier terms. Profit lives not only inside an order, but also in when cash leaves and returns.
A simple SKU example
First define this hypothetical ledger: 59 USD is the item amount before discount, not an already-discounted payment. Costs are COGS 22, packing and handling 6, payment/platform fees 3, separately charged freight subsidy 7, one discount 4, estimated refund loss 3, and support/exception cost 2. Handling excludes that freight, and the refund estimate has not already reduced revenue. Pre-ad contribution is 59 - 22 - 6 - 3 - 7 - 4 - 3 - 2 = 12. Using the pre-discount 59 numerator gives a contribution ratio near 20.3% and zero-contribution ROAS of 59 / 12, about 4.92. Using discounted item payment 55, before the estimated refund, instead gives 55 / 12, about 4.58. Do not mix these bases; deduct matched ad cost separately to reach post-ad contribution.
Now model a bundle whose pre-discount item amount increases from 59 to 79, with 12 of extra COGS and handling and all other assumptions temporarily unchanged. The extra 20 of revenue is not all profit: 12 + (79 - 59) - 12 = 20, so pre-ad contribution is 20, not 26. On the same pre-discount basis, 20 / 79 is about 25.3%, and zero-contribution ROAS is 79 / 20 = 3.95, or 395%. After the same 4 discount, item payment is 75 before the estimated refund; 20 / 75 is about 26.7% and ROAS is 75 / 20 = 3.75. Recalculate if freight, fees, or refunds change with the bundle instead of silently keeping them fixed. AOV, bundle structure, shipping thresholds, discounts, inventory mix and refunds all change what ads can afford; this model is not an observed price-test outcome.
How refunds and discounts change the answer
Refunds are not only a support problem; they are a pricing variable. A product with an 8% refund rate and a product with a 2% refund rate can have identical price and COGS but completely different ad tolerance. Refunds may also include return shipping, unsellable inventory, support time, and disputes. Pricing models should include expected refund loss before the month-end report arrives.
Discounts are not only a conversion lever. Ten percent off, free shipping, buy X get Y, bundle pricing, automatic discounts, and discount codes affect AOV, margin, buyer expectation, and repeat quality differently. Before launching a promotion, ask whether the goal is first-order conversion, inventory movement, AOV lift, or list growth. Without a clear job, the store often trades profit for low-quality orders.
When to use the pricing calculator
Use the pricing calculator when you can list price, COGS, payment cost, fulfillment, shipping subsidy, discount, refund rate, and ad cost. Run at least three scenarios: normal price, promotion price, and bundle price. For each scenario, review contribution profit, contribution margin, acceptable CPA, break-even ROAS, and cash recovery timing. Do not stop at gross margin percentage.
If the calculator shows thin profit, inspect four directions before reacting: price may be too low, bundle or AOV may need work, fulfillment or shipping may need redesign, or ads may need a smaller test. Cutting ad budget is not the only answer. Healthy pricing is the shared result of page promise, promotion, logistics, inventory, and acquisition economics.
Pricing cost stack
| Cost layer | Where to get it | Common mistake | Calculator input |
|---|---|---|---|
| COGS | Supplier quote, purchase order, BOM | Using purchase cost only and missing packaging or defects | Product cost |
| Fulfillment | 3PL bill, warehouse fees, freight table | Using standard freight only and missing reships or free-shipping subsidy | Fulfillment and shipping cost |
| Payment fees | Shopify, gateway, payout statement | Using a rough percent and missing cross-border or refund costs | Payment and transaction fee |
| Discounts | Discount rules, order reports, affiliate commissions | Reading conversion lift without margin dilution | Discount and commission |
| Refunds | Refund rate, support logs, return cost | Treating refunds as a month-end issue, not pricing input | Refund and support loss |