I filed for 2016 already thinking all I had for 2016 was my w2. However, I just received a 1099-R in the mail. It's not much money & it hadn't even crossed my mind that I would need to report this. It's less than $500 and the amount with held was about $90. Should I report this? If so, how do I change my what I have already filed (it's been approved already). Thanks.
