Do This Afternoon Margin Check Before Amazon's October Fees

If you sell on Amazon, the next fee change is a test of whether each product still keeps money after the marketplace takes its cut. Amazon issued a 34-page fee revision on July 14, with the changes becoming effective on October 1, 2026. Net margin is the money left after product cost, marketplace fees, shipping, returns, storage, and any other cost tied to the unit. A fee change can move that number faster than a price change, so the afternoon check is worth doing before the new rules arrive.

The fee change tests margin, not price

The first question is whether the SKU, a single product listing, still keeps money. A product can look healthy on the listing and still lose on the back end once fees, storage, and returns are added. A survey covered by Ecommerce Times found that 61% of U.S.-based Amazon sellers had a blended FBA fee load increase above $1.50 per unit since July 1, equating to 5 to 7 percentage points of margin compression for common price points. The survey number is a warning, not a verdict. Your SKU may be above or below that range, and the hit is not one-size-fits-all. A high-priced SKU may absorb the change. A low-priced SKU may not. The audit has to be done by SKU, not by store, because the fee lands on the unit, not on the whole shop. The store-level average can hide a SKU that is losing money while another one covers the loss.

The same numbers expose the weak SKU

Start with the price the customer pays. Subtract the product cost, the marketplace fee, the fulfillment fee, the return cost, the storage cost, and any inbound fee. What remains is the money you keep. If that number is small, a fee change can erase it. Returns and storage are the quiet costs. A return can undo the profit from several sales. Storage can grow when you hold extra inventory to avoid a fee. Put both on the SKU line, not in a general bucket, so the SKU line shows the real cost of selling that unit. The unit-level number is what the fee change will test.

Amazon is adding dynamic referral tiering to five categories: Health & Household, Beauty, Apparel, Grocery, and Sports & Outdoors. Jane Cheung, Amazon's VP of Selling Partner Services, said AWD users saw an average 12% lower total fulfillment cost per unit in H1 2026 versus standard FBA-only routing. The routing choice can move the same SKU from thin to workable, or from workable to weak. Use the list once, in one sitting. Each item is small enough to finish quickly, but together they turn the numbers into a decision. The first item sets a baseline, the middle items add the costs that move with the fee change, and the last item forces a choice.

• Write the current net margin for each SKU before adding the new fees.
• Add the applicable $0.27 to $1.58 per-unit inbound surcharge, by size tier, for sellers outside the preferred inbound network.
• Add returns and storage costs to the same SKU line.
• Check whether your inventory cover meets the new 45-day low-inventory fee threshold, up from 28 days.
• Note the new referral tiering for any SKU in those categories.
• Compare AWD against standard FBA-only routing for fulfillment cost.
• Mark each SKU as keep, adjust, or drop based on the new net margin.

The decision is keep, adjust, or drop

After the list, each SKU should have a new net margin. A comfortable margin means keep the SKU and note the new cost. If the margin is thin, adjust the price, cut a cost, or change the routing. If the margin is negative or too thin to support the work, drop the SKU before the new rules arrive. Make the choice while the number is still fresh, not after the fee has already changed the money you keep. A quick afternoon pass can save you from carrying a weak SKU into the new fee structure.

This article is general information, not tax or financial advice. Consult a qualified professional about your situation.