Originally posted on 01/19/2013:

An excellent idea is always request a transcript of everything the IRS has on file before you send in your taxes. You can simply call the IRS help number and after being on hold about 15 minutes you ask the rep to send you a "transcript for 2012".

That way you will know exactly what the IRS has. It can prevent a lot of headaches especially with stocks and derivative sales. Many times a broker will correct or amend what they report to the IRS, sometimes even after you have filed. But by requesting a transcript you guarantee you don't accidentally miss something.