If you haven't heard of it yet, I suggest anyone considering retirement, investments, mortgages, or any large financial transaction get acquainted with Dinkytown.net (and no, I am not in any way associated with them).
Dinkytown.net has dozens and dozens of free, online, interactive financial caluclators that I find very helpful and actually fun to use (OK, I'm a bit of a geek). I was just playing with the "How long will my retirement last?" calculator. By putting in various numbers and looking at the results (be sure to select "View Report") I suddenly realized that by the time I retire I will probably be earning $30,000/yr in interest and/or capital gains on my 401k. That plus maybe $20,000/yr from part-time work should meet my financial needs for quite a while without tapping into my retirement princple. I'd never considered how helpful that interest would be to me. Then I was able to change the numbers to see what would happen if I started to take an extra $10,000/yr from principle to pay for travel and fun things. Turns out my financial picture is not as bleak as I thought.
I highly recommend Dinkytown.net as one of the tools you use when planning your financial future.
It lets you model quite a bit of what could happen. It is free and is one of the best.
You might also try http://www.firecalc.com/ , which is a slightly different way to check your financial plan.
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