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This calculator will allow you to compare the effect of taxable vs. tax-deferred or tax-free investments over a period of time. By answering the following questions, you can find out the average real rate of returns for each investment group for the time period specified by you.
What is your marginal tax rate?
 
What do you expect your marginal tax rate to be at the end of the investment period surveyed?
 
How many years will you be saving and investing?