Fast formula for get Next Anniversary date of an employees - Absence plan enrollment start date

Summary

how to get next anniversary date of existing employee as enrollment start date for absence plan

Content

Hi

I am trying to do this:, if anyone can help with logic

Enrollment Start Date formula that will enroll existing users as of their next coming anniversary date, and new hires will enroll automatically.

 

How can i come up with next anniversary date logic  ?

 

 

Thanks for reply