My original tax return was efiled and accepted by both US and state. I originally forgot to include daycare expenses for my daughter which would have provided an additional several hundred dollars to my return. I amended my return, but it was rejected because I forgot to include my 1098-T to back up my college expenses. I've found that I don't have receipts to corroborate my expenditures on books, so my amended return would provide < $100. Since I initiated an amended tax return, am I obligated to continue, or will the IRS make me file the amended return or try to audit me? At this point it's not worth my time.
Answer to question as amended by OP's comment.
Since you did not sign the amended return paperwork, there is no amended return that has been submitted to the IRS (even if IRS kept a copy of the submitted paperwork in its files).
At this point, you have several options.
As a final comment, if you amend your Federal return, you might need to amend your State income tax return also, so don't forget that part. If you submitted your amended return to the State when you sent in your unsigned Federal amended return, and the State amended return has been accepted already, then if you now decide to not amend your Federal return after all, you will need to file yet another amended State return saying put everything back the way it was.