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Text from the Social Security Administration Trustees Report (URL: http://www.socialsecurity.gov/OACT/TR/TR08/tr08.pdf)

"Another way to illustrate the financial shortfall of the OASDI system is to examine the cumulative value of income less cost, in present value. Figure II.D4 shows the present value of cumulative OASDI income less cost over the next 75 years. The balance of the combined trust funds peaks at $2.7 trillion in 2017 (in present value) and then turns downward. This cumulative amount continues to be positive, indicating trust fund assets, or reserves, through 2040. However, after 2040 this cumulative amount becomes negative, indicating a net unfunded obligation. Through the end of 2082, the combined funds have a present-value unfunded obligation of $4.3 trillion. This unfunded obligation represents 1.6 percent of future taxable payroll and 0.6 percent of future GDP, through the end of the 75-year projection period."