The short answer
For an item-level estimate, subtract purchase cost, selling fees, shipping paid, packing, refunds, and other direct costs from the sale proceeds you retain. Keep shared business overhead separate, and do not treat missing costs as proof that an item was free.
Start with the proceeds you actually retain
Separate item price and shipping charged from money collected for others, such as marketplace-collected sales tax. Use consistent fields when comparing a transaction, payout, and report.
A payout may combine several orders and adjustments. It is not automatically the profit on the item you most recently sold.
Use a worked example
Illustrative sale: $60 item price plus $5 shipping charged gives $65 before costs. Subtract $10 purchase cost, $9 selling fees, $8 postage, and $1 packing materials. The item contributes $37 before shared overhead and income taxes.
If you later issue a refund or incur another direct cost, update the record. The free Reseller Profit Calculator lets you explore those assumptions without connecting an account.
Distinguish zero from unknown
A blank purchase cost means the data is incomplete. A recorded zero should mean you have a reason to treat the purchase cost as zero in that record. Do not use zero simply to make an incomplete report look finished.
GrimLister lets you add purchase costs after a sale. Keep your receipt or acquisition notes and confirm the amount before saving.
Account for the business around the item
Do not subtract the same cost twice just because it appears in two views. A shipping label already included in a financial total should not become a second expense without a reason.
- Record item-specific expenses against the item when appropriate.
- Track shared costs in the broader business records.
- Check for refunds and shipping adjustments.
- Review the same date range when comparing reports.
- Reconcile totals with source records before relying on them.
Use the result for the next sourcing decision
Compare retained money with the effort required to test, photograph, store, and pack the item. A category can produce attractive sales and still be a poor fit for your available time.
This is a management estimate, not a determination of taxable income. Your accounting method and circumstances affect tax reporting.
Common questions
Is an eBay payout my profit?
No. A payout can combine transactions and adjustments and does not account for every purchase cost or business expense.
Why does my item profit differ from the business total?
Shared overhead, reporting periods, missing data, and adjustments can make them different. Compare the underlying records rather than assuming the views measure the same thing.