I like this approach. When I tried it with my numbers, I was 100% Ps with the full SS benefit (deferring to age 70) and 99.1% Ps with the SS benefit reduced to 79% of the full amount.I include it. Retiring in 69 days @ age 55. Planning on the full amount ($60k) starting @ age 70. We're @ 99% Ps with it, 81% Ps without it. Why the hell would I work another 5 years to mitigate a low probability risk? If you think SS is going away any time soon, then keep on working. I'll buy you a beer with my SS check if we ever meet.