Social Security Questions? Ask a Social Security Expert
Under US law, Social Security is not indebtedness of the US government, future benefits are paid at the discretion of Congress and each future Congress, so they may not be cashed in for a lump sum. What exactly are you trying to do?
The US Supreme Court has settled this issue in its Fleming v. Nestor decision in 1960, see https://www.ssa.gov/history/nestor.html. Payments to Social Security are taxes that do not necessarily entitle somewhere to a future benefit. My answer is totally accurate as to how government policy works.
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I'll see if another expert can answer your question.... Good luck!