Pricing Plans Request: Setting a Specific Renewal Date

Working on it
Currently, it is not possible for you to set a specific renewal date for recurring payments from your clients' pricing plans. Renewal dates are defined by the date clients purchase their plans or complete their free trial periods. 
Workarounds:
Instead, you can extend clients' plans (for subscriptions that already have an end date). You can also charge clients offline, or use a Wix Invoice to cover the additional subscription time period. 
We are always working to update and improve our products, and your feedback is greatly appreciated.