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Cost items to review before margin calculation
Margin estimates become more realistic when channel fees, payment fees, shipping, and returns are included.
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Separate fixed and variable costs
Fixed costs such as rent or payroll should be viewed separately from costs that rise with each sale.
If both are mixed together, break-even and margin interpretation becomes less reliable.
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Include channel and payment fees
Marketplace fees, smart store fees, and payment fees can all change the real amount you keep from each order.
Ignoring them often creates a large gap between calculator profit and actual settlement profit.
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Do not ignore shipping, ads, and returns
Free shipping and paid ads reduce the real profit per order more than many teams expect.
If return rates are meaningful, return shipping and repacking costs should be reflected too.