When is my payment due
Can't find my due date on paramount plus?
If you subscribed with payment through Apple, then you can find the renewal date for the next billing cycle in your Apple ID subscriptions overview.
See your subscriptions overview - Apple. All your active subscriptions through Apple will be listed there. It would list “Renews <date>” (iPhone) or “Next billing date: <date>” (Mac) for each of those. For monthly plans, it would be the same numerical day of the month each time. If you have been billed before on this plan, then the next time would be on the same day of the month as last time (i.e. look in your records).
If you subscribed through Paramount+ directly, then see you subscription details at their site instead.