Billing cycle of a Subscription

Each Subscription has its own Billing cycle: 

1. For license-based subscription it is calculated from the subscription’s start date: if the subscription is purchased on the 12th of November, then the subscription’s billing cycle is 12. License-based subscription can have monthly or annual billing frequency.
2. Consumption-based subscriptions are aligned with the billing cycle of reselling contract under which this subscription is purchased. A usage-based subscription always has a monthly frequency.
3. One-time subscription has a one-time payment and does not have billing frequency at all.

Add-on subscription always gets its billing cycle from parent subscription, regardless of its start date.