Referral fees
Amazon's referral fee is a percentage of the item's selling price deducted from every sale. It's the commission Amazon takes for providing access to its customer base and marketplace infrastructure. Rates vary by category: most categories sit at 15%, electronics and computers run lower at 6–8%, automotive at 12%, jewelry at 20% for lower-priced items. The referral fee is applied to the total selling price including any gift wrap charges but typically excluding shipping charges if shown separately.
The referral fee is non-negotiable and calculated before any other deductions. This means it's one of the first and largest costs to model in your margin calculation. At 15% on a $25 product, you're giving Amazon $3.75 before any other expenses. At scale, that's $375 for every $10,000 in revenue — a significant cost that can't be reduced through negotiation but can be minimized by choosing the right category classification for your product.
FBA fulfillment fees
FBA fulfillment fees cover pick, pack, and shipping for each unit Amazon ships on your behalf. These fees are determined by the product's size tier (small standard, large standard, small oversize, large oversize, and special oversize) and weight. In 2025, small standard items (under 4 oz) start around $3.22 per unit, with fees scaling up to $7–$12 for large standard items in the 3–20 lb range and $50+ for large oversize products. Check the current fee schedule on Seller Central — Amazon typically adjusts FBA fees annually.
Fulfillment fees are often where sellers get surprised. A product that weighs 1 lb on the scale can be classified as "large standard" because of its packaging dimensions, pushing fees significantly higher than expected. Measure your fully packaged product (length × width × height) before finalizing your margin calculation, and use the FBA Revenue Calculator with accurate dimensions to get a realistic fee estimate. Even a few inches of extra packaging can shift your product into a higher fee tier.
Monthly storage fees
Amazon charges monthly storage fees for all inventory sitting in their fulfillment centers, calculated per cubic foot. Standard monthly rates in 2025 run approximately $0.78/cubic foot January through September and $2.40/cubic foot October through December — the Q4 rate is more than three times higher, reflecting peak demand on Amazon's warehouse capacity. This seasonal spike catches sellers off guard if they've planned inventory around the off-peak rate.
Per-unit storage fees seem small in isolation but compound across your entire inventory. A product with a cubic volume of 0.5 cubic feet sitting for three months at the standard rate costs $1.17 in storage — that's real money that should be allocated in your margin model. Sellers with slow-moving inventory, large product dimensions, or seasonal products are most affected by storage fees and should be especially careful to include them in unit economics calculations.
Long-term storage fees
Long-term storage fees are charged for any inventory that has been at an Amazon fulfillment center for more than 365 days. The current rate is $6.90 per cubic foot or $0.15 per unit — whichever is greater — assessed monthly. These fees can quickly exceed the value of the product itself for slow-moving items, creating a situation where clearing the inventory at a loss is actually less expensive than the ongoing storage charges.
Amazon sends Inventory Health alerts and Inventory Age reports in Seller Central to flag at-risk inventory. Monitor these proactively. If a product has been sitting for 10–11 months without significant sales velocity, you have a decision to make before the long-term fee kicks in: run a price reduction to accelerate sales, create a removal order to return inventory to your warehouse, or run a liquidation order to recoup something above zero. Waiting until the fee triggers is always the most expensive option.
Inbound placement fees
Amazon's inbound placement fee, introduced in 2024, charges sellers for Amazon's cost of distributing inventory across their fulfillment network when you send a shipment to a single location. If you send all your inventory to one fulfillment center (rather than splitting it across multiple Amazon-designated locations), Amazon charges a per-unit fee for the redistribution work they do internally. Sellers who use Amazon's partnered carrier program and send to multiple fulfillment centers can reduce or eliminate this fee.
This fee caught many sellers off-guard when first introduced. The workaround is using the "Inventory Placement Service" options in your FBA shipment settings to understand the cost tradeoff between splitting shipments yourself (more shipping complexity) versus paying Amazon's placement fee (simpler but with an added cost). For smaller shipments, paying the fee is often more practical than coordinating multiple inbound shipments.
Returns processing fees
Amazon charges a returns processing fee for categories with above-average return rates, including apparel, footwear, and electronics accessories. The fee applies when a customer returns a product and Amazon processes the return through their fulfillment center. For most standard product categories, returns are processed at no additional per-unit charge, but the cost of the refund itself (including the Amazon fees that don't get fully returned) should be factored into your per-unit economics.
Returns also create secondary costs beyond the direct processing fee: returned inventory often comes back in a condition that can't be resold as new, requiring either a Grade and Resell reprocessing service or a removal and liquidation. High-return categories (clothing, electronics, jewelry) need a returns buffer built into their margin models — typically 3–8% of revenue depending on category, historical data, and product specifics.
How to minimize fee impact
The most effective fee reduction lever is product dimensions. Reducing packaging by even a small amount can shift your product from a higher to a lower size tier, saving $0.50–$2.00 per unit in fulfillment fees. Before your first production run, optimize packaging to be as compact as possible without compromising the product. Calculate your fee tier with precise measurements using the FBA Revenue Calculator before committing to packaging specifications.
For storage, maintain a lean inventory policy — use the FBA Inventory Age report to flag slow-moving units and act on them before they age into long-term fee territory. For referral fees, ensure your product is classified in the correct category (incorrect categorization can lead to higher referral fee rates than necessary). And for inbound placement, build a workflow around splitting shipments or budgeting for the placement fee so it's never a surprise in your margin calculations.