From the NVC website: The sponsor is required to submit an IRS transcript or photocopy of only the most recent Federal income tax return with the I-864. So does it mean, its just the Form 1040 coz that goes to the federal (IRS)?
3 years of form 1040 also include your w-2s, dont worry pag may mistake ka they will email you and let you know what your missing and then they'll tell you to bring it to the interview.