Calculating resale margins from retained transactions
Reviewed and revised — 12 September 2026. This article has been updated to correct unsupported claims and reflect the current enquiry-based offer. Its original publication date and URL are retained. A sale above purchase cost is not automatically a profitable item. Marketplace charges, shipping, refunds and the work involved can change the result substantially. Name the measure Markup compares the difference with purchase cost. Gross margin compares it with revenue, using a defined cost-of-goods basis. Contribution after selling costs is another measure. None of these is automatically net business profit after overheads. ...