how did you become aware that you "needed" to amend? were you properly claimed as a dependent on another's return? - if so, I can understand the "zero" you may not get a IRS notice for a while. if you claimed one when it should be zero , if you don't file amended return you will get a bill from the IRS, for the taxes + late payment penalties and interest and the longer you wait the higher the penalties and interest will be. in similar situations, the IRS might not send a notice for over a year. make sure to amend correct year and if state is involved amend that also.
