# Cost
Costs can be linked to the budget in order to estimate whether an expense will fit within the allocated budget.
To manage your budget go to Budget
You can add costs to your change. It can be :
* Time cost
* Fixed cost
* Material cost
{% hint style="warning" %}
A cost cannot be added once the problem has been closed or resolved.
{% endhint %}
## Add a cost
* To add a cost, click on **Add a new cost**
* You must add the information you wish :
* **Name**;
* **Budget**: select the dedicated budget (For more details, see [Budget](/documentation/modules/management/budgets.md));
* **Begin date**;
* **End date**;
* **Duration**;
* **Time cost**;
* **Fixed cost**;
* **Material cost**;
If you enter a budget, this expense will be deducted from the budget in question
{% hint style="info" %}
You can modify a cost later once it has been validated.
{% endhint %}
## Delete a cost
* To delete a cost, you need to click on it;
* The information appears in the top insert;
* Click on **Delete permanently;**
If you enter a budget, this expense will be deleted from the budget
{% hint style="warning" %}
Once deleted, you will not be able to go back, you will have to enter the cost manually again
{% endhint %}
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