I find Employee Express the easiest way to continue the TSP catch-up or to make any changes to TSP contributions. I haven't used paper forms in eons. For me pay period 25 (which is paid on 1/3/17) is the first 2017 pay period to reflect TSP contribution changes. One year I forgot to renew the catch-up and noticed it in my pay stub. I was able to go to Employee Express and submit it with a 24 pay period spread.
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