Missing purchase costs: why profit is incomplete

Sale price alone cannot determine margin.

Practical steps

1. Find products without costs.
2. Enter the correct unit cost.
3. Separate historical from current costs.
4. Review results after completing data.

Worked example

Selling at 59 TND with a 45 TND purchase cost leaves 14 TND before delivery and ads.

Mistake to avoid

An unknown cost is not a genuine zero.

Working checklist

Choose a clear period and keep a document or reference for each expense. Separate inventory purchases from the cost of units sold to prevent double deduction. Review product, delivery, return, advertising and other expenses and reconcile collected cash with orders. Missing costs make results provisional: complete the data before increasing advertising or inventory.

Common question

Will an update change past orders?

Check its scope and preserve earlier batch costs.

Put it into practice

Create your store on Matjri, prepare the information needed for this guide and test the result as a customer on your phone before sharing the link. Edit photos, descriptions and options and manage orders from your store dashboard.

Sources and further reading

• INS — Répertoire national des entreprises

Editorial review: 11 October 2026. Calculations are illustrative; tools and fees may vary by account and supplier.