My previous employer sent out a second W-2 (not corrected just additional), stating that due to an administrative error Stock Option Exercises were never reported on the 2011 W-2. I already filed my return. They did not send out this letter with the additional W-2 until March 26th, which I received on April 9th.
What should I do? If I file an amended return is there any way to make them pay the cost for their screw up?