I do not have 1040 for one year for H1 interview. Is it okay?

I have worked from 2013(F1).I am going for my H1 interview. I have my w2 and 1040 for 2014 and 2015 but I only have w2 for 2013. I cannot find my 2013 1040. Is it okay?

Yes, it is ok !

If you have most recent ones with you, then don’t worry too much of the old ones…They may not ask for it even, in the interview.