The Congressional Budget Office estimates that there is only a 7% probability that someone born in 2000 will receive their Social Security benefits as promised today. The better news is that with a probability of 58% the cut in benefits will be 20% or less.
Since the CBO isn’t trying to predict future policy, these "probabilities" should be taken with more than a grain of salt. Sill these numbers are an arresting way of presenting the basic data on projected Social Security revenues and scheduled payments.
Hat tip to Paul Krugman.