packrat44
Thinks s/he gets paid by the post
I always thought that in addition to statistical interests, the IRS could be checking to see if your salary was in line with your occupation. For example, if one listed "part time convenience store cashier" and yet the W-2 indicated $650,000 annual salary, they might want to call the taxpayer in for an audit.
So, in 2009 I listed my occupation as "oceanographer" because I didn't retire until November 9th. From 2010 on, I have listed it as "retired oceanographer".
I do not think the IRS would give a second thought as long as one paid the tax on that $650,000. However, if you listed your occupation as CFO of a major bank and you claimed a salary of $20,000, you might get a letter requesting an explanation.