The problem with the most of the calculators is that they use today's tax rates and today's tax brackets to do these calculations comparing pre- versus post- tax retirement account contributions. I've been paying taxes for 30 years now and tax rates & brackets have varied significantly over the years.
What I really need is a FireCalc-type of calculator which will run scenarios using different tax rates and tax brackets from the past 30 - 50 years 
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