theory of tsp is pretax dollars go in and acrue tax-free (advantage), then are taxed at a hopefully lower bracket later (advantage).
theory of roth is aftertax dollars go in, neither the principal nor gains ever to be taxed again (advantage-especially if rates go up) if you follow the rules.
i would imagine the match would stay the same up to 5%. you are proposing that the match gets increased by the amount it 'would've' got if you put it in tsp, and then once in roth also gets the preferential tax treatment on the withdrawl side too (double advantage).
everything gets taxed once in either system. you are mixing the two to avoid taxation on the free match. where do the free match funds come from? yep, you guessed it, tax dollars. if you can figure a way to pencil it out, i think you've got a lucrative future in the perpetual motion industry. can i get in on the ipo?
that would be a neat trick, but i don't see it happening for a number of reasons. but the most important reason is because you have a job, therefore you are the mule. if you want to pay no taxes then you got to ride in the wagon. now it's a free ride of course, and some interesting things go on back there, but we are the company we keep.
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