Large employers (those issuing more than 250 W-2s for 2011) must report the value of their employees’ health coverage on the W-2s they issue for 2012 (in January of 2013).  Given the complexities of this process, the time to start preparing is now.  As explained in this article, the IRS has just issued another round of guidance on this reporting requirement.  This is likely to be the last guidance available before the requirement takes effect.