Sorry I didnt see this thread ealier, I could have also confirmed that for you.
I have been getting form 12's since I started doing off-payroll PRSA contributions.
I rang revenue two years ago or so asking why I was getting them (as I thought it was meant to be random), and they confirmed it was due to my PRSA relief.
It certainly is an annoyance, as I already write to revenue to alter my PRSA related credits each year. I guess if you are not proactive at that, it is a good way to ensure you are claiming all your tax reliefs.
Biggest pain for me is calculating my interest from my "interest rate tarting" activities.
Last year I also have a redundancy and social welfare payments, so it is going to be more complicated than usual this year...aghh!