> For the complete documentation index, see [llms.txt](https://doc.simax.fr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.simax.fr/documentation-simax-anglais/functional/invoicing/the-periodic-invoicing.md).
# The periodic invoicing
## Context:
Testo orders a corner sofa for its new premises. In accordance with the agreement, an invoice will be sent to it every month.
## Implementation in Simax
The first thing to do is to set Testo's billing frequency.
To do this, go to **Sales > Customer > Customers**, then **\[Conditions]**, **|Periodic invoicing|**, and select “Monthly.”
The next invoice date is 12/01/2024, calculated automatically.
As before, we will create the order and **\[\[Save]]**.
Then, we prepare the order in **Sales> Order> Orders**, by selecting the order and clicking on **\[\[Preparation voucher]]**.
We choose the preparer, then **\[\[ok]]**.
And let's validate it.
And finally, we save the delivery note.
An invoice line is then created on 11/11/2024 in **Sales > Invoicing > Lines to invoice.**
Please note that each time a delivery note is issued in favor of Testo, an associated invoice line will be created and issued on the next invoice date.
To invoice, simply select the line to be invoiced and click on **\[\[Single Invoice]]**.
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