Field Guide Amazon and multi-channel operations
Amazon FBA fees, explained
FBA fees are where margin quietly disappears. Here is every fee that hits a unit, fulfillment, storage, surcharges, and removals, what drives each one, and the levers that actually lower them.
Amazon FBA fees are where margin goes to die quietly. A product can look profitable on the sale price and the cost of goods, then lose its margin one fee at a time: fulfillment, storage, a surcharge here, a removal there. If you do not know exactly what hits each unit, you cannot know which products actually make money. Here is every FBA fee, what drives it, and the levers that lower it.
The Amazon FBA fees that hit every unit
Two fees apply to essentially everything you sell through FBA.
The fulfillment fee. FBA fulfillment fees are a per-unit charge for picking, packing, and shipping, based on the product’s size tier and weight. Amazon measures and weighs your unit, assigns a size tier, and charges the fee for that tier. Because tiers have thresholds, a unit that sits just over a boundary pays the higher tier’s fee.
Storage fees. Amazon storage fees are a monthly charge for the cubic volume your inventory occupies, higher in the busy fourth-quarter months. The more space you hold and the slower it sells, the more this costs.
The referral fee. Amazon’s commission on the sale, a percentage of the sale price, charged on every sale regardless of how you fulfill. Not strictly an FBA fee, but it hits the same margin, so count it.
A product is not profitable because the sale price beats the cost of goods. It is profitable after every fee, and the fees are where the truth lives.
The situational fees
These do not hit every unit, but they punish specific mistakes.
Aged-inventory surcharges
Stock that sits too long accrues an aged-inventory surcharge on top of normal storage, escalating the longer it stays. This is the fee that turns slow inventory from a cash-flow problem into an active drain.
Removal and disposal fees
Getting unsellable or excess stock out of FBA, removing it back to you or disposing of it, carries a per-unit fee. Necessary sometimes, but a cost to plan for, not to stumble into.
Returns and other category fees
Some categories carry a returns-processing fee, and certain products attract handling surcharges. Know which apply to your category before you assume a SKU’s margin.
Lowering the fees you can control
Run every SKU through an FBA fee calculator against its real cost of goods, then work the levers below on the ones the math exposes.
The FBA fee levers
- Reduce dimensions and weight, both drive the fee and the size tier
- Watch the size-tier thresholds, a small change can drop you a tier
- Keep storage lean to avoid aged-inventory surcharges
- Verify Amazon's measurements, dispute the wrong ones
- Track restock so you never overstock into storage fees
- Audit fees against contribution margin per SKU, regularly
The fees connect to the rest of your operation: overstocking to beat restock limits backfires into storage and aged-inventory fees, so lean, accurate replenishment is the same lever that protects both. This is core amazon-operations discipline, knowing your true per-unit economics so you scale the products that make money and fix or cut the ones that do not.
If you suspect fees are eating products you think are profitable, a margin-by-SKU teardown that surfaces the real economics is exactly what a Growth Audit delivers.