Almost everyone wants to build a nice retirement nest egg. But doing so is easier said than done. Projections, pie charts, and professional guidance all seem to be key parts of the recurring process, but putting these components together can get complicated as well as time-consuming. Ugh.

You don't have to start your retirement fund journey with all of these resources, though. There's one simple formula that will get you started on the path to becoming a millionaire that you can use for the bulk of your working years. That is, set aside 15% of your annual salary in a tax-deferring retirement account, and invest it in an S&P 500 (SNPINDEX: ^GSPC) index fund. That's it.

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Source Fool.com