If you have ever built tooling around marketplace selling, you have probably written some version of the same function: given a product, what is the actual net per unit. This post walks through that model, because the profit column in most off-the-shelf research tools quietly drops at least one of the three fee layers.
Three Fees, Not One
Amazon takes its cut in three separate places, and they behave differently, which is the whole reason a single blended percentage gives you the wrong answer.
The referral fee is 8 to 15 percent of the selling price depending on category. It is proportional, so it scales cleanly and never surprises you.
The fulfillment fee is roughly $3.22 for a small standard-size item and rises to $10 or more for large heavy ones. This one is effectively fixed per unit within a size tier, and fixed costs sitting against a variable price are exactly where naive models break.
Storage is monthly, charged on volume, and it climbs steeply from October through December. Long-term storage and removal fees stack on top once inventory ages, so a slow mover pays twice, once in carrying cost and once in the capital parked in a warehouse.
Why The $20 To $75 Band Exists
Encode those three and the familiar price band stops being an assumption and becomes an output.
Below about $20 the fixed fulfillment fee is a large fraction of revenue. A $3.22 fee on a $12 item is 27 percent before the referral fee has taken anything, and what remains cannot absorb returns and advertising.
Above about $75 the arithmetic is fine but conversion is not. The purchase stops being an easy yes, so you pay more per conversion in advertising and hand the extra gross margin straight back to the ad platform.
The band experienced sellers quote is simply the range where the fixed component is small enough and the buying friction is still low.
The Plan Choice Is Just A Breakeven
The Professional plan is $39.99 a month, the Individual plan is $0.99 per item sold. The crossover sits at 40 units a month, which is the easy half of the comparison.
The harder half is that the Individual plan does not include advertising, bulk listing tools or Buy Box eligibility. Since the Buy Box is where roughly 83 percent of Amazon sales happen, treating this as a $39.99 decision rather than an eligibility decision is the actual mistake.
What The Model Should Output
Two numbers, not one.
Net per unit after all three fee layers, calculated at a realistic selling price rather than the one you hope to hold. And a demand check: whether the top ten listings in the niche are each moving 300 or more units a month. If they are not, the fee math is irrelevant, because the category is too thin to carry anyone.
The full breakdown of the fees, the four business models and the product criteria is in our Amazon FBA guide, which is the source for the numbers used here.
Getting the order right matters more than getting the model elegant. Run the fee math first, then go looking for a product that survives it.
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