When it comes to retirement accounts, the Roth IRA is one of my favorite tools. With tax-free growth and tax-free withdrawals in retirement, it separates itself from other accounts like 401(k)s and traditional IRAs (although those are great options, too).

How much someone will need in retirement largely depends on their lifestyle, but the $1 million mark has traditionally been a significant financial goal. Achieving this feat using only a Roth IRA isn't a walk in the park, but it's very much attainable. Here are three essential tips you should know.

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Source Fool.com