Recurring revenue is the portion of revenue that is expected to be ongoing and renew for a defined temporal period of a year (Annual Recurring Revenue/ ARR) or month (Monthly Recurring Revenue/ MRR).
The form of recurring revenue that is appropriate to reference should be determined on the basis of the billing associated with that revenue. Determination of churn in customers on a monthly basis isn’t possible to determine when software is billed yearly. See: Pricing
The amount of recurring revenue changes from one period to the next such that:
Period 2 End ARR =
Net ARR Period 2 =
The Net ARR is the net change from one period to the next accounting for new ARR, lost ARR, grown ARR, and shrunk ARR.