
Monique H. answered 03/21/19
Enrolled Agent and Accountant with concise lectures
It seems you may have answered your own question. The only way to arrive at precise future net worth and cash flows is to capitalize social security contributions. I suggest to create an account in the long term investment category of the balance sheet.
However, since it’s possible that not all social security contributions are recovered, a periodic valuation adjustment should be made to this account. This will leave the true investment portion of these contributions at an even more precise balance.
More information about your future social security benefits as of any given date can be found by visiting the SSA website:
https://www.ssa.gov/oact/cola/Benefits.html
I recommend setting up a “my Social Security” benefits account!