Granted you dont have to pay tax on the accumulated wealth you will earn...but the name of the game is COMPOUND interest, not tax with those. Lets say you have 1000 dollars. One goes into a roth IRA at 30% (example) so you have 700 dollars in that account. Another is a normal IRA 1000 goes in there. After 30 years, assuming you contribute 50 dollars a month all of those years, 7% interest also.....
1000 starter = 69115.05
700 starter = 66680.1
After 45 years
1000 = 212753.2
700 = 205816.16
Time value of money is your friend
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