Understanding Amazon Fees: Where Your Margin Actually Goes

On paper, the maths looks harmless: sell a product for €29.99, pay Amazon 15%, keep the rest. In reality, your margin melts in four stages – and if you don’t know them line by line, you only notice in the settlement report (or worse: at year-end) that a “profitable” product has been burning money.

This article dissects a typical Amazon sale into its cost components, clears up the three most common calculation mistakes, and shows how to work out your true contribution margin per unit in two minutes.

Anatomy of an Amazon sale: four deductions, one net profit

Every unit you sell is hit by four cost blocks:

1. Referral fee. Amazon’s commission, typically between 8% and 15% depending on category – charged on the gross selling price including any shipping you charge the buyer. This is easy to miss: you also pay commission on the VAT you merely pass on to the tax office.

2. FBA fulfilment fee. A fixed amount per unit, driven by the size tier and weight of the packaged product. For small, light items it is often the single largest cost – a €9.99 product can lose more here in percentage terms than to the referral fee.

3. Cost of goods and inbound freight. Purchase price plus transport into the FBA warehouse. Constant per unit, but freight is frequently left out of the calculation.

4. VAT. The silent line item: part of your gross price belongs to the tax office, not to you. At 19%, that is already €4.79 of a €29.99 sale – more than the referral fee.

Worked example: the €29.99 product

Line	Amount
Selling price (gross)	€29.99
− Referral fee 15%	−€4.50
− FBA fulfilment fee (standard, ≤ 500 g)	−€3.20
− Cost of goods incl. inbound freight	−€9.50
= Contribution margin per unit (gross)	€12.79
− VAT contained in the price (19%)	−€4.79
= Net basis before fixed costs	≈ €8.00

So “€30 of revenue” becomes roughly eight euros – before storage fees, PPC advertising, returns, and the monthly selling plan are even considered. That gap between perceived and real margin decides whether scaling multiplies profit – or losses.

Three mistakes that ruin margins

“I calculate the 15% on the net price.” No – Amazon charges the commission on the gross price including buyer shipping. Calculating on net systematically understates the fee.

“FBA fees are roughly the same.” The fulfilment fee jumps at size-tier boundaries. A product that slips into the next tier because of its packaging instantly loses noticeable margin – packaging optimisation is real money here.

“VAT is a pass-through item, I ignore it.” Correct for bookkeeping, dangerous for pricing: your price floor must be based on net proceeds. Our guide to VAT in e-commerce shows how to separate gross and net cleanly – and when selling across the EU, the destination country’s VAT rate shifts your margin further without a single fee changing.

Get the real number in two minutes

For the concrete calculation, we built the free Amazon Fee Calculator: enter selling price, category, size tier and cost of goods – the calculator breaks down referral fee, FBA fulfilment fee and contribution margin per unit, for marketplaces in Germany, France, Italy, Spain, the UK and the US. You see whether a product is worth listing before you list it – not after the first settlement period.

To look beyond the single unit – for instance how different EU VAT rates reshape profit at a uniform gross price – try the E-Commerce Profit & VAT Simulator (OSS).

Conclusion: margin is not a feeling, it is a booking

Amazon fees are no secret, but they are scattered: commission here, fulfilment fee there, VAT on top. Run the numbers once per product – for example with the Amazon Fee Calculator – and you make pricing decisions on facts instead of gut feeling.

And if you want to know permanently: KudTax computes this breakdown automatically for every single order – fees, proceeds and VAT are pulled from your Amazon settlements, matched to transactions, and exported booking-ready to DATEV. The one-off calculation becomes continuous margin monitoring across all marketplaces.