<prompt> Human: I earned 30k in 2016.I bought stocks for 3.5k, and then I sold stocks and made 300 profit or below that.Then I forgot about that, in fact I havent even touched my money they are still in broker account, which was online service.This year would have been my first year to file taxes.I completely forgot about this, then my friend told me he made 50 profit in stocks. Then I remembered I too made and then it hit me that I nowhere mentioned that in the taxes.Other detail though I paid for my college tution and got credited 1500 for that so maybe with 300 profit or not itd have not mattered. My questions are: - What would happen, possibilities? - How to fix it, does it need to be fixed, its like 300. - If nothing happens this year do i need to continue to worry for next decade? - My friend told me Id get fined 8k. seems excessive!?  <response>: You just need to file an amended return. Its no problem if you do it. 