Another possible option

I'm a CPA in Southern California. Another possible option, if you extended your return, is to file what's known as a Superseded tax return. This actually takes the place of the first return if you file it before the due date. If you haven't extended your return, then you aren't able to go this route. The IRS and most states allow superseded returns, and it's why (among other reasons) we encourage our clients to file an extension, even if they intend on filing before 4/15. Many times certain elections need to be made on an originally filed return for example, and can't be made on an amended return.