I am going to mail in my PA state taxes. Do I need to attach 1099s, W-2s, etc.?

[DMarkM1]

Yes, you need to include copies of all income documents (1099s, W2s, etc.) when mailing in the tax returns.

[Pebetrix]

"Include" means loose or is it preferred to stable to return? If stapled how should the return be collated? Stapled to what page of return?

[ThomasM125]

You should staple all of the pages of the return together, along with the W-2's, 1099's, etc. Staple it towards the bottom on the left side of the return.