Properly used, a Roth IRA can be an incredibly powerful tool for your retirement. Once in your Roth IRA, your money can grow tax-free inside that account for the rest of your life. Plus, once you're eligible, if you need to tap the money, qualifying withdrawals are also completely tax-free.

As awesome as a Roth IRA can be, however, those two words -- "properly used" -- make all the difference when it comes to getting the most out of the plan. All current and prospective retirees should know these three tips to be a Roth IRA millionaire.

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Source Fool.com