I have rescinded my previous comment.
However, I think we are both wrong here.
I was incorrect in saying they are the same Treasury bonds available to the market. In fact, they are special issue bonds, not available to the public. However, the interest rate is near market, derived from a formula driven by market rates. In addition, the funds do hold some public market securities, although fewer than in the past. I suspect this is because they did not want to unduly crowd out private investment by pushing rates higher.
That said, by law, the funds are invested in Treasury securities. This is not an accounting creation - they are actual obligations of the US government, and it is simply inconceivable that the government would default on them, which would result in significant unrest in the global capital markets, without question. Any large government reneging on any credit would have similar results. It would be far simpler, and more likely, for the government to simply print more money or issue new bonds in the public markets, although both would have significant market effects.
So I don’t think your left pocket, right pocket analogy has any traction. If it did, the “trust fund” would only be an accounting creation, instead of an actual practice backed by law and actual legal notes of credit.
Heres’s the SSA’s take on it:
Why do some people describe the “special issue” securities held by the trust funds as worthless IOUs? What is SSA’s reaction to this criticism?
As stated in the answer to “What happens to the taxes that go into the trust funds?”, most of the money flowing into the trust funds is invested in U. S. Government securities. Because the government spends this borrowed cash, some people see the current increase in the trust fund assets as an accumulation of securities that the government will be unable to make good on in the future. Without legislation to restore long-range solvency of the trust funds, redemption of long-term securities prior to maturity would be necessary.
Far from being “worthless IOUs,” the investments held by the trust funds are backed by the full faith and credit of the U. S. Government. The government has always repaid Social Security, with interest. The special-issue securities are, therefore, just as safe as U.S. Savings Bonds or other financial instruments of the Federal government.
Many options are being considered to restore long-range trust fund solvency. These options are being considered now, over 35 years in advance of the year the funds are likely to be exhausted. It is thus likely that legislation will be enacted to restore long-term solvency, making it unlikely that the trust funds’ securities will need to be redeemed on a large scale prior to maturity.