I just filed our taxes (Fed and stupid ass CA). After I received the confirmation I was going though all of our mail (it has piled up) and shredding and tossing crap. AFTER I filed (and it was acepted with in the hour) I found a 1099 misc from a side job my husband did and a 1099-S from the sale of our house. The 1099-S wont affect anything because I already had the figures on the tax return, I just hadn't checked the 1099-S form box. You can't write off a loss of a sale of a house anyway, we lost just over $121k.

My mom had mailed them to us in a bubble envelope with some magazines and stuff that had come to her house and I just never opened it. I could kick myself.
BUT with the new 1099 misc it will add an addition $4k to our taxes and now I have to file an amended return. You can't electronically file it either, you have to mail it in. I'm so pissed at myself.
I am all exhausted now. I also filed my son's returns (both Federal and Ohio). Little turd is getting back almost $5k.