Most people cannot visualize the power of tax deferral. If one-dollar doubles 20 times, would you believe you would have over $1 million!! If you deducted 25% tax at the end of 20 years, you would have $750,000 less.
Let us compare that scenario to paying tax as you go. If you have $1 and it doubles, and you pay 25% tax on the gain, you will have $1.75. Continue the calculation 20 times. Would you believe you would end up with only $72,000? Now that is a compelling advantage.