> For the complete documentation index, see [llms.txt](https://docs.trackwill.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.trackwill.com/campaign/custom-cost-model.md).

# Custom cost model

When Custom cost model is checked you can fix your costs on the calendar manually. To do this select the cost model:

![](/files/-LvIvYjw7CI9gT2ejPD7)

Then **Save** campaign settings. And in the Campaign page grid check saved campaign and click **Edit Daily costs** button:

![](/files/-LvIwuytV2w1aX69B50K)

At this step, you can fix your costs data for a time period. Also, you can specify the type of payment and the cost of the click at which you buy traffic day-by-day. CPC - cost per click, CPM - cost per 1000 clicks. 

When configuration is done click **Save** button.