Personally? I don't think it's as valuable later in life. But there are individual variables.
The value normally associated with a traditional 401K is that you put money away pre-income tax, the deposits grow tax fee, however Uncle Same want's their taxes and you pay taxes upon withdrawal once you reach retirement age. The real advantage here is if you will be in a lower income tax bracket in retirement than in your working years. Just to pick numbers lets say you working years are in the 27% bracket, but in retirement you will be in the 22% bracket. There is a tax savings of there because of the lower tax rate.
So the variables are "What other income will you have in retirement." (Not likely to work out for the wife and I was with our Defined Benefits income we will remain in the same tax bracket.)
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With a Roth the real savings comes from having the money in the post-tax savings plan for a long time. You paid the taxes on the deposits, but you don't pay taxes on the interest, or the interest on the interest, or the interest on the interest on the interest. (The whole compound interest thingy.) I mean sure if you deposit a $1,000,000 post-tax at 50 you can get a significant return, but most middle class folks don't have that kind of cash laying around to seed a Roth to a high value in later years.
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Don't get me wrong, I have nothing against the Roth IRA, Traditional IRA, or 401K type plans. I highly support them but to make them valuable in retirement you have to start young, be disciplined, and look for long term growth. I DOESN'T MATTER which it is, what does matter it not waiting until you are in your 50's and 60's to start.
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My wife and I have been, I guess fairly responsible. We both earned military pensions which have provided some financial security and flexibility. (We are ex-enlisted, so we are talking big bucks here, but we are still thankful.) Since our 30's every single paycheck we've received have had a little somet'n-somet'n go into our Defined Contributions retirement accounts. As a result our disposable income will actually increase when we stop working in a few year.
WW