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If you applied for your dependents\' I485 along with yours,
I think most lawyers ask that you include 3 years of tax
returns to show that you can support your family, also
included is I-134 (Affidavit of Support)
If you are the sole filer, then many lawyers think that
you do not need such tax returns. Although if there is any
suspicion by INS, they may ask for them later (RFE) to
show that you were paid by your employer during your H1
period. In that case, INS may also ask for W2s.