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A Roth IRA is arguably the single best way to save for retirement. One question I receive frequently is how to invest in an IRA. And specifically, is a 3-fund portfolio a sound approach to investing in an IRA. The short answer is that it's an excellent approach for beginners just starting out.

There is one situation, however, where I would make an adjustment. If you also have traditional retirement accounts, I would use them for the bond allocation, reserving the Roth IRA for stock ETFs and mutual funds.