> ## Documentation Index
> Fetch the complete documentation index at: https://help.vinkit.co/llms.txt
> Use this file to discover all available pages before exploring further.
# COGS — Cost of Goods Sold
> Track your purchase costs to calculate your real margins
export const VinkitCTA = () => ;
## What is COGS?
**COGS** (Cost of Goods Sold) represents the **purchase price** of your articles. By entering the COGS for each article, Vinkit automatically calculates your real **profit margin**.
**Margin = Selling price - Platform fees - COGS**
Without COGS entered, Vinkit cannot calculate your real profitability.
## Add COGS to an item
From the **Articles** section of the dashboard, click on the article to open its detail page.
In the **COGS / Purchase cost** field:
1. Enter the price at which you purchased the article (in euros).
2. Click **Save**.
The margin calculation updates immediately.
## Bulk COGS entry
To enter the COGS for multiple articles at once:
1. Go to **Articles** and switch to the **table view**.
2. The **COGS** column is directly editable: click on the cell and enter the amount.
3. Move from one cell to the next with the **Tab** key.
4. Changes are saved automatically.
You can also **import your COGS** via a CSV file. Go to **Settings > Import** and use the provided file template.
## Understanding calculated margins
Once the COGS is entered, Vinkit displays for each sold article:
| Data | Description |
| ------------------ | --------------------------------------------------- |
| **Selling price** | The amount paid by the buyer |
| **Platform fees** | The commission charged by the selling platform |
| **Shipping costs** | Delivery costs (if at your expense) |
| **COGS** | Your purchase cost |
| **Net margin** | What remains after all deductions |
| **Margin %** | The net margin as a percentage of the selling price |
## View your global margins
In the **Finances** section, the summary table automatically includes COGS to display:
* **Total margin** over a given period
* **Average margin** per article
* **Most profitable articles** and **least profitable articles**
See the [Finances](/en/guides/finances) guide for more details.
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## Best practices
* **Enter the COGS at the time of purchase** — don't put it off, you risk forgetting the exact price.
* **Include all costs** — if you paid shipping to receive the article, add it to the COGS.
* **Use CSV import** for large inventories — it is much faster than manual entry.