Recurring invoices Setup

Go to system configuration > general menu group > recurring transactions

 In this area you are going to be setting up the contract terms, which means you'll define which period the recurring is going to be running, example for a 12 12-month cycle and at which day you're going to be running the recurring

 Enter code and put a description and a define when you want the recurring to run.

I suggest setting up a yearly recurring contracts for 12 months.  so that would be one for 2019 and another one for 2020.  The reason behind this is that you cannot use the same contract for the same customer.