Start by trying to save 2x your annual salary.   Jonathan Clements offers a million dollar savings strategy.

Mr. Farrell figures the breakthrough occurs at around two times income. Let's say your salary has hit that $80,000, you have amassed $160,000 in savings, you are socking away 12% of your pretax income each month and your investments earn 6% a year.

Over the next 12 months, your $160,000 portfolio would balloon to $179,518, or $19,518 more. Your monthly savings would account for $9,600 of that growth. But the other $9,918 would come from investment gains. In other words, you've got to the crossover point, where the biggest driver of your portfolio's growth is now investment earnings, not the actual dollars you're socking away.