How Amazon's FBA and referral fees actually work
Every seller eventually asks the same question after their first payout: where did the rest of the money go. Between the price a customer paid and the amount that lands in your account sits a stack of fees, and most sellers never look closely enough to understand which fee is for what.
The frustrating part is that the exact numbers change fairly often, Amazon revisits its fee schedule at least once a year, so any article that quotes a specific percentage is often out of date within months. What's worth understanding instead is the structure underneath, because that barely changes even when the numbers do.
Referral fees: Amazon's cut of the sale
A referral fee is essentially Amazon's commission for putting your product in front of a customer and processing the transaction, and it applies whether you fulfill the order yourself or use FBA. It's calculated as a percentage of the item's total sale price, and that percentage is set per category rather than being a single flat rate across the whole store.
Categories that are cheap to source and sell in volume, like basic electronics accessories, tend to sit at a lower percentage than categories with higher margins built in, like certain apparel or luxury goods. Most categories also carry a minimum referral fee per item, so on very low-priced products the fee can work out to more than the headline percentage suggests. This is why the actual amount depends entirely on which category your listing sits in, not on a single number you can memorise for your whole catalogue.
FBA fulfillment fees: paying for pick, pack and ship
If you use FBA, a separate fee covers Amazon picking your item off the shelf, packing it and shipping it to the customer. This is priced by size and weight tier, not by product value, so a cheap item and an expensive item of the same dimensions cost roughly the same to fulfill.
Amazon groups products into tiers such as small standard, large standard, and oversize, and within each tier the fee also scales with actual weight. For lighter items that take up a lot of box space, Amazon applies dimensional weight, calculating a fee based on volume rather than actual weight, since a bulky, light product still occupies warehouse and truck space that a compact one does not.
Storage fees and the cost of sitting still
Beyond the per-order fees, Amazon charges monthly storage fees based on how much space your inventory occupies, measured in cubic feet. These rates are typically higher in the final months of the year, when warehouse space is at a premium ahead of the holiday shopping season, and lower for the rest of the year.
There's also a long-term storage surcharge for inventory that has been sitting in a fulfillment centre for an extended period without selling, on top of the regular monthly fee. This is Amazon's way of discouraging sellers from using its warehouses as long-term storage for slow-moving stock, and it's one of the easiest fees to avoid simply by watching your inventory age report and running clearance pricing before a SKU crosses that threshold.
Why the numbers keep changing
Amazon reviews and updates its fee schedule on a recurring basis, usually citing its own rising costs, warehouse space, labour, fuel and transportation among them. Because these are Amazon's operating costs, not yours, the changes are not negotiable and rarely come with much lead time beyond an email notification a few weeks ahead.
This is exactly why a fee explainer shouldn't lean on specific percentages. The structure, category-based referral fees, size and weight-based fulfillment fees, cubic-foot storage charges, is stable. The rates attached to that structure are not, and treating last year's numbers as gospel is a common way sellers under-price a product and only notice the margin problem months later.
Where to check the numbers that actually apply to you
The only reliable source is Amazon's own Seller Central fee schedule, plus the Revenue Calculator tool, which lets you enter a specific product's category, weight and dimensions and see the exact referral fee and fulfillment fee that would apply right now. It takes a few minutes per SKU and it's worth doing before you finalise pricing, not after your first month of payouts arrives lower than expected.
This is also where a storefront and a seller's broader Amazon presence connect. Getting a product listed and merchandised well is only half the job, pricing it so the margin actually holds up after Amazon's cut is the other half. If you're setting up or rebuilding a storefront, that's exactly the kind of build we do at ARTH.
Questions we hear a lot
Do I pay a referral fee if I fulfill orders myself instead of using FBA?
Yes. The referral fee applies to every sale regardless of who fulfills the order, since it's Amazon's fee for the sale itself, not for storage or shipping. FBA fulfillment fees are separate and only apply if you use FBA.
Why did my fee for the same product change without my listing changing?
Amazon periodically updates its fee schedule, sometimes annually, sometimes with mid-year adjustments to storage or fulfillment rates. Your product hasn't changed, but the rate attached to its category or size tier has, so it's worth rechecking the fee schedule whenever a payout looks different.
What's the fastest way to find the exact fees for one of my products?
Use Amazon's Revenue Calculator inside Seller Central. Enter the category, weight and dimensions and it will show the current referral fee and fulfillment fee for that specific product, which is far more reliable than going by a percentage you remember from a past sale.
How do I avoid long-term storage fees?
Keep an eye on your inventory age report and move slow sellers through clearance pricing or removal before they cross Amazon's long-term storage threshold. Once a unit is flagged, the surcharge applies on top of the regular monthly storage fee until it sells or is removed.
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