A little history for those care:
For years, the IRS has allowed you to exclude certain qualifying commuting expenses for mass transit and parking costs if your employer sets up a way to have these funded through a payroll deduction. The monthly limit is adjusted annually for inflation, and historically the pre-tax limit has been the same for both parking and mass transit.
That changed in 2012, when for some reason the pre-tax limit for mass transit was lowered to $125, while the parking exclusion limit remained at $240.
So for 2012, I continued to fund the entire cost of my monthly commuter rail ticket through payroll deduction, but since my pass costs more than $125, the remainder was deducted with post-tax dollars.
Fast-forward to the latest budget deal, and they "fixed the glitch" and restore parity to transit and parking for 2013 (up to $245). I knew all that, but what I just found out today is that they ALSO restored parity for 2012 and retroactively increased the transit limit to $240 for 2012.
The problem is, how do I take advantage of this? My W2 reflects the higher taxable income in box 1, so do I need to request a revised W2?