For Finance Guy (or anyone else, really)--I arrived in OEF late December--too late for the Dec LES, so I ended up paying taxes that month. Unfortunately, I never got reimbursed for December tax free in the Jan LES. Finance told me the tax free will be reimbursed when I file my taxes. My W-2 was correct, in that it doesn't count December's salary, but it does show that I was taxed during that time.
Maybe someone can help me understand why/how filing my taxes will pay me back for the tax free in Dec.