After you file

Thank you for your reply.  This appears to be my issue in that I did not enter the 1099(B) as in my case the borker did create one.   Since I don't agree with the assessment, would you recommend I file an amended return and notify the IRS of such on my response (and include any back-up) or provide them with the information and let them amend based on my evidence?  Also, is there a specific form I would need to complete in order to amend?

Very helpful response, so again thank you.