w2 or tax return required for filing I-140/485?

[guakeifuai]

People around are talking about submitting W2 and tax return together with I-140 and I-485 (concurrent)? Are these documents required? My attorney only submitted a letter from my department head with a statement of my annual salary.

Thanks in advance!

 

[RoaringBull]

not needed, but may be asked for w2 by uscis at the of approving i485.