Four in 10 working Americans say they will never be able to afford to retire, a Harris Interactive survey of 1,005 adults for the American Institute of Certified Public Accountants found.

In addition, 55% do not know how much they will need to afford retirement, and among those who think they know, they are low-balling the figures. Asked how much they would need for a 20-year retirement starting at age 65, those earning $50,000 to $75,000 gave a median estimate of $250,000.

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