Can you have different year-ends?  If you could, then think of the tax deferral opportunities!  

Why do you ask this question?  Is it a software hurdle?  

Sometimes I make 12/31 the YE in the software even though the corp legally terminated a few months prior. I don't know what harm there would be in doing this.

'domesticated'. I know what you mean but 'domesticated' is not the correct word. Or concept.  Unless your client is a cow.😂🤣