I cannot efile my PA return because I have a K1 from an S corp. The mailing instructions say to include all the required attachments but never lists what attachments?

[tomccs2]

Do I need to include copies of K1, W-2's, etc.  when mailing?   Or just the forms included in the printout?

[JohnW152]

Yes, you'll need to include copies of your K-1 and W-2s, among other things.

According to Assembling Your PA-40 in the PA-10 Instructions Booklet, you should include your:

• Original PA-40. 
• Federal Forms, W-2, 1099-R, 1099-MISC, 1099-NEC.
• PA Schedule OC, and the required supporting documents when claiming any of the restricted tax credits that PA law allows.
• PA Schedule(s) RK-1, PA Schedule(s) NRK-1. If you did not receive PA schedules, then submit federal Schedule(s) K-1.
• PA Schedule(s) G-L.
• All other required PA schedules and forms, including any additional sheets you prepared.
• All other required documents.

Please see the link above for additional details.