Next Billing Date refers to the date on which a subscription will get renewed and the payment will get collected. In Chargebee, billing date is a subscription specific attribute: it will be based on the date of subscription activation and the billing frequency of the plan.
Sign up Date: Oct 1st (Monthly Plan)
Next Billing Date: Nov 1st Sign up Date: Oct 1st (Weekly Plan) Next Billing Date: Oct 8th Sign up Date: Oct 1st 2015 (Yearly Plan) Next Billing Date: Oct 1st 2016
When there is a trial period associated with a plan, the subscription will get activated only after the trial ends. In this case, the billing date will be based on the activation date.
Sign up Date: Oct 1st (Monthly Plan with 15 days trial period)
Activation Date: Oct 16th Next Billing Date: Nov 16th
The billing date of a subscription can be altered any time via the web interface or using the Change Term End API .
You can change the billing date of a subscription to postpone the date of renewal or bring it forward to suit the circumstance. The change will not create any prorated charge or prorated credit.