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How feasible would it be to retire just maxing out a Roth IRA?
Assuming you max-out your Roth IRA with $5000 in inflation-adjusted contributions every year from 25-65, your balance at age 65 will depend on the post-inflation return you get in the account.  Assuming you withdraw 4% per year after that, here is what your income will be: (All numbers are in inflation-adjusted 2011 dollars.)   If your post-inflation return is zero - if you buy treasury bonds, money-market accounts, or something like that - you'll have a simple $5000 * 40 = $200,000, which will give you an income of around $8000 per year. If you get a 3% post-inflation return - e.g. fairly safe Muni bonds, corporate bonds, and boring stocks - you'll approximately double your money to around $393,000, giving you an income of over $15,000 per year. If you get a 6% return - e.g. more aggressive stocks and more risk-taking - you'll approximately double your money again to over $825,000.  A 4% withdrawal rate will give you an income of around $33,000 per year. Stocks have historically returned around inflation + 8% - that will get you over $1.4 million - and an annual income of over $56,000 per year. So, yes, it is feasible to retire on nothing but a maxed-out Roth IRA.