You must have enabled the CIS feature to proceed.
Navigate to the Settings > Organisation > Details & Tax menu.
Click on the Tax tab and fill in your own Tax and CIS details as shown in the example below.
Navigate to the Tax > CIS > Returns menu.
You can now create a new CIS return or select an existing one. In this example, we will be submitting a return that was created earlier.
Click on the Monthly returns link and view the return that you would like to submit.
Before you can submit your CIS return, all the subcontractors on the return must be verified.
Click on the Submit to HMRC button to complete.