How to Calculate Reselling Profit Margin Correctly
- carbootsupplier
- 3 days ago
- 2 min read
How to Calculate Reselling Profit Margin Correctly
Sales revenue can look impressive while a business makes very little profit. Calculate at item level so buying and pricing decisions are based on reality.
Start with net sales income
Record the amount paid by the buyer, including postage they paid. Then subtract refunds, discounts and taxes collected on behalf of authorities where applicable to your accounting.
List direct costs
Direct costs commonly include:
Purchase price
Marketplace and payment fees
Promoted listing charges
Outbound postage
Packaging
Cleaning, testing or repair
Return postage or allowances
Use actual figures after the sale and realistic estimates before buying.
Calculate gross profit
Gross profit equals net sales income minus direct costs. For example, if net income is £40 and direct costs total £26, gross profit is £14.
Understand margin and return on cost
Profit margin is profit divided by sales income, multiplied by 100. Return on cost compares profit with the money invested in the item. Both measures are useful: margin shows efficiency, while return on cost helps compare buying opportunities.
Allow for overheads
Subscriptions, storage, insurance, equipment, mileage and accounting do not always belong to one item. Allocate a sensible share or monitor them against total monthly gross profit.
Plan for returns and losses
A category with frequent returns needs a larger buffer. Include expected damage, unsellable stock and price reductions in forecasts instead of assuming every unit sells perfectly.
Value your time
Cleaning, testing, listing and packing have a cost. A high percentage margin on a low-priced, labour-heavy item may still be unattractive.
Review actual results
Compare forecast and actual profit. Update your buying rules when fees, postage or return rates change.
A simple spreadsheet is enough to begin. The important part is including every cost consistently and using profit, not turnover, to judge performance.
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