While preparing 1040 and 1120S for new client for 2016 return I was reviewing the 2015 returns prepared by the former tax preparer. As I was preparing the form 8903 for 2016 I noticed that the 2015 preparer failed to take advantage of preparing form 8903. Amending the 1120S for 2015 by including the form 8903 and also amending the 2015 1040 would have a significant positive impact for the client. Is there any downside to amending the 2015 tax returns? Are amended 1120S filings subject to intense scrutiny or likely audit?