The full margin formula
Real margin = (Sale price − eBay fee − payment fee − promoted listing fee − shipping cost − return reserve − chargeback reserve − COGS) / Sale price
12.9%
Avg. eBay fee
3–8%
Avg. promoted listing
2–5%
Return reserve
Numbers to track per SKU
- Landed cost (product + inbound shipping + duty)
- eBay final value fee (varies by category)
- Payment processing (~2.7% + $0.25)
- Promoted listing rate (your set %)
- Outbound shipping (often subsidized)
- Return rate × return cost
- Chargeback rate × chargeback cost
