Amazon FBA looks cheap until you stack the fees. A seller who budgets 'about 15%' is modeling only the referral fee and ignoring the four other charges that land on the same unit — and the typical stacked cost of FBA on a standard-size product is 30–35% of the sale price. On a $25 item, that is $7.50 to $8.75 gone before you count what the product itself cost. Every fee below is from Amazon's 2026 schedule; run your own numbers through the Amazon FBA Calculator rather than trusting anyone's rule of thumb, including this article's.
The referral fee is the one everyone knows: 8–17% of the sale price including shipping, typically 15%. The range matters because it is set by category — electronics sit at 8%, clothing and shoes at 17%, jewelry at 20%. Amazon held referral rates steady for 2026, so last year's category math still applies. On a $25 sale in a 15% category, the referral fee is $3.75. Note what it applies to: the full amount the buyer pays, shipping included. Free-shipping offers do not escape it; the fee is calculated on the total collected.
The fulfillment fee is the per-unit charge for Amazon picking, packing, and shipping your product, set by size and weight tier: $3.06–$8.00+ per unit, with small standard units running roughly $3.22–$4.75 and a 2-pound standard unit around $5.40. Amazon raised these about $0.08 per unit on January 15, 2026. On top sits the fuel and logistics surcharge: 3.5% of the fulfillment fee, added April 17, 2026 for US sellers — so a $3.90 fulfillment fee really costs about $4.04. Selling through the holidays? Budget the peak-season rates running October 15, 2026 through January 14, 2027; Q4 is Amazon's most expensive quarter to fulfill in.
Storage and placement are the quiet fees — small per unit, brutal in aggregate. Monthly storage runs $0.78 per cubic foot January through September and jumps to $2.40 per cubic foot October through December, which is why Q4 inventory planning is a financial decision, not just a logistics one. Leave inventory sitting and the aged inventory surcharge kicks in at 181 days ($0.50 per cubic foot, climbing to $6.90 past 365 days) — Amazon is explicitly pricing you out of using its warehouses as long-term storage. Then there is the inbound placement fee, $0.27–$1.58 per unit. None of these show up per sale, which is exactly why sellers forget them until the monthly statement arrives.
The selling plan is the easiest math on the page. Professional costs $39.99 per month; Individual costs $0.99 per item sold. The break-even is $39.99 ÷ $0.99 ≈ 40.4 units per month — sell more than about 40 units monthly and Professional is cheaper, plus it unlocks bulk listing tools and category approvals Individual lacks. Below that volume, Individual wins on pure cost. Most serious sellers land on Professional quickly; the plan pays for itself the moment you cross that forty-unit line, and the gap compounds every month after.
Full worked example on a $25 product in a 15% referral category, small standard size. Referral fee: 15% × $25 = $3.75. Fulfillment: say $3.90 for the unit's tier. Fuel surcharge: 3.5% × $3.90 ≈ $0.14. Inbound placement: say $0.50 per unit. Total Amazon fees: $3.75 + $3.90 + $0.14 + $0.50 = $8.29 — that is 33.2% of the sale price, squarely in the typical 30–35% band. If the product costs you $6 landed, per-unit profit is $25 − $8.29 − $6 = $10.71, a 42.8% margin on price. Healthy-looking — until storage, returns, and advertising enter the picture, which is why the Amazon Profit Calculator exists: it runs this full stack from your actual inputs instead of mine.
FBA versus fulfilled-by-merchant is the strategic question the fee math should answer. FBA buys you the Prime badge, Amazon's checkout conversion lift, and freedom from pick-pack-ship and most returns handling — at the cost of the full fee stack above. FBM skips the fulfillment fee, fuel surcharge, and storage fees, but you pay your own shipping and labor, and you lose the Prime badge that drives a large share of buy-box wins. The pattern: FBA usually wins for standard-size, fast-moving products where fees are predictable and the conversion lift pays for them; FBM can win for oversized, heavy, or slow-moving products where fulfillment and storage fees balloon past self-shipping costs. Run both scenarios with real numbers before committing inventory either way.
A closing discipline for 2026: recompute your per-unit economics quarterly, because Amazon adjusts this schedule every year — the January fulfillment increase and April fuel surcharge both landed in 2026, and Q4 storage at $2.40 per cubic foot punishes anyone carrying summer inventory into the holidays. Keep a simple sheet per SKU: sale price, referral fee, fulfillment fee, surcharges, storage allocation, product cost, net profit. When any fee line moves, the sheet tells you within minutes whether the SKU still earns its shelf space. Sellers who treat the fee schedule as a living input survive Amazon's annual adjustments; sellers who memorized last year's numbers do not.