Ignore original post. The TAFB Non-Taxable is not included in Fed Taxable income. From the lengthy paystub info I've deduced that the Fed Taxable YTD is the Gross less the TAFB (non-taxable), less 401K, less dental, plus Non Revenue Travel, and plus Basic Life Imputed Income.
I always like to confirm paystubs to W-2's, and flight attendant paystub entries are very lengthy, and lack good description (denoting pre-tax items would help).
