I came up with one follow up question to this post
If I file for an extension now, can I include the form 3115 when I am sending the extension request via mail and then later eFile the main tax returns before 10/15?
Or while filing for extension my only option is to just eFile for extension now (without sending physical Form 3115) and later file by sending in physical mail and include Form 3115, by 10/15?
On a side note, this will be my first time filing 4797, so more homework for me 🙂