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A price gap is not a margin. Margin is what's left after every fee. Here's how to calculate it properly.
The formula
Net margin = Resale price − (purchase cost + marketplace commission + FBA/shipping fees + net VAT + estimated returns + any customs duty).
Worked example (Amazon FBA)
- Resale price: €35
- Purchase cost (wholesaler): €14
- Commission (15%): €5.25
- FBA fees: €4
- Estimated net VAT: €2.30
- Net margin ≈ €9.45 (ROI ≈ 67%)
Don't forget
- VAT: depends on your tax scheme and the country of sale.
- Customs/import duty: for sources outside the EU.
- Returns: budget a percentage for them.
- Long-term storage fees: on unsold stock.
The gross-gap trap
A product with a +€20 gross gap can end up at −€1 net once every fee is counted. Always think net. ArbitragePro+ applies real fees per category/country and only shows positive net spreads.