How to help a new client that hasn’t lodged tax returns in 16 years?

I have a new client that hasn't lodged tax returns in 16 years. I'm looking for advice on how to help them start.
Thank you.

3

Sounds like trouble, this is not a client you want to take on.

3

I would fire that client and never look back…

3

Wow, how did they get away with it? Stay away..