cPanel Partner NOC billing is processed using "Snap-Shot" billing. Snap-Shot monthly billing occurs at 4 PM US Central Standard Time on the 15th of each month. Any active licenses at that time will be included in the invoice as per the Partner NOC Agreement.
It is recommended that an audit is performed 24-48 hours before the 15th of each month. This will ensure the accuracy of the invoice and not include any licenses no longer used.