I received a letter from irs asking for me to send my w2 in. Why do I need to send them in. My tax situation was simple and nothing different that prior years??

[ThomasM]

The best way to deal with IRS is to simply give them whatever documentation they want.  They can ask for your W-2 because they have a mismatch with their records, or they can ask for it as part of a random review.  It doesn't necessarily mean there's a problem.

The sooner you give it to them, the sooner they'll move forward and (hopefully) send your refund.