FBA fees creep up quietly: a product measured a little too large, stock that sits too long, shipments split across too many warehouses. Here are the levers that actually move your fees, and how to check each one.
Check that every product is in the right size tier with correct dimensions, keep inventory at a steady level that matches demand, act on aging stock before surcharges hit, compare inbound placement options, and reduce returns. Most savings come from fixing a few high-volume products, not from small changes across the whole catalog.
Amazon changes fee rates and rules regularly, so treat this as a checklist of what to look at, and check the current numbers on Amazon’s fee pages before making decisions.
| If you see this | Likely cause | What to try |
|---|---|---|
| Fulfillment fee higher than expected | Wrong dimensions or a size tier just above the line | Re-measure, or test smaller packaging |
| Storage fees rising | Too many weeks of cover, slow sellers | Reorder smaller and more often |
| Aged inventory surcharges | Overstock on a few ASINs | Promote, bundle or remove early |
| High placement fees | Shipments sent to a single location | Compare split-shipment options |
| High return costs | Listing doesn’t match the product | Fix images, sizing and bullets |
Our team reviews size tiers, inventory levels, aging stock, inbound plans and reimbursements as part of our FBA consulting, and turns the findings into a short list of changes for your highest-volume products.
See what’s covered on our Amazon FBA consulting page, or estimate per-unit margin with our FBA profit calculator.
The fulfillment fee per unit, which depends on size tier and weight, plus monthly storage fees, and charges such as aged inventory surcharges, inbound placement fees and low-inventory-level fees. Amazon updates these regularly, so check the current fee pages in Seller Central.
Compare the dimensions and weight Amazon has on file in Seller Central with your own measurements of the packaged product. If Amazon’s numbers are wrong, you can ask for the product to be re-measured.
Yes. Fulfillment fees are based on the packaged size and weight, so a slightly smaller box can drop a product into a cheaper size tier. Make sure the new packaging still protects the product.
Order closer to real demand, watch inventory age reports monthly, and act on slow sellers early with promotions, removals or liquidation before they reach the surcharge thresholds.
It can. Amazon may charge a low-inventory-level fee on some products when stock is low compared with demand. The goal is steady stock, not the smallest possible amount.
Every case study below comes directly from unedited Seller Central, Amazon Ads, Search Query Performance, Sellerboard, TikTok Shop, and Walmart Connect dashboards.
+102% Ad Sales · −53% ACOSRedesigned the main image for click-through, rewrote listing copy and A+ Content to convert, then rebuilt Sponsored Products and daily bid management.
+117% Ad Sales · −29% ACOSRebuilt campaign hierarchy and segmentation with disciplined bid rules and A+ Content so 54% more ad spend produced 117% more ad revenue.
+126% Ad Sales · −40% ACOSTightened listing copy and imagery in week one, cut wasted spend across unprofitable targets, and set SKU-level ACOS goals with daily bid adjustments.
+144% Ad Sales · +141% OrdersMapped untapped high-intent keyword pockets and expanded placement coverage while upgrading creative so sales jumped from $38K to $93K at stable ROAS.
+118% Click Share · +106% ClicksDiagnosed Search Query Performance funnel drop-off and redesigned the main image around the core buyer need—doubling click share even as market volume dipped.
~$97K → ~$160K MonthlySequenced listing conversion upgrades, A+ Content across hero SKUs, and structured PPC review cycles—compounding from ~$97K to ~$160K in monthly revenue.
+906% Purchases · 9.62% ShareCombined SQP search-funnel analysis, buyer-language listing SEO, main image CTR work, and exact-match ranking campaigns to capture 9.62% purchase share.
+$87K Net Profit · −30.6% Ad CostAudited SKU-level contribution margins in Sellerboard, eliminated $34K in low-margin ad waste, and reversed YoY profit trend from −31.4% to +12.5%.
£256 → £297,128 GMV · 11,827 OrdersBuilt an affiliate recruitment, seeding, Discord community, and brief engine from scratch—generating £197,522 in creator-attributed GMV and 11,827 orders.
+51.9% Shop GMV · +67% OrdersBroke through creator concentration plateau by expanding publishing affiliates from 503 to 556 and scaling GMV Max ads behind top-converting videos.
$1.27K → $21.6K Sales · 2.72 ROASRebuilt Walmart listing quality scores from Poor to Good, cleaned up catalog structure, and scaled Walmart Connect Sponsored Search to 2.72× ROAS.
Read all 12 original written client reviews verbatim—linked directly to Trustpilot so you can verify every single one.
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