Do i need to attach my k1 form 1065 when I mail in my return?

[JulieCo]

Yes, a copy of all the K-1 forms issued should be sent in along with the 1065 form when you file it via the mail.  Plus, you will want to keep of copy of your K-1 form to use to file with your personal return, as well as distribute copies of any other K-1 forms issued to any other members/partners.