Is it possible that I could claim both? I am totally confused. It seems like I would qualify to claim both situations! And I contributed to Federal Thrift Savings and made less than 52k for this year. I am trying to rough out my taxes. Is there an IRS site to go to with this question? Or do IRS people frequent this site? I did contribute to Thrift Savings and to IRAs in this year and my Fed pay for the year is about 21k.and it seems that blocks 27 and 53 both apply to me. Could that be possible? Correction.....Line 27 should read line or block 32. Sheet 27 of the instruction book tells you how to figure this out though.