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The United States Social Security Administration collects payroll taxes and uses the money collected to pay Old-Age, Survivors, and Disability Insurance benefits. This is done by way of trust funds. There are two trust funds which the Social Security Administration controls: Old-Age and Survivors Insurance (OASI) and Disability Insurance (DI), collectively referred to as the "Trust Fund" in this article. When the program runs a surplus, the excess funds increase the value of the Trust Fund. At the end of 2014, the Trust Fund contained (or alternatively, was owed) $2.79 trillion, up $25 billion from 2013.〔(Social Security Trustees Report-Press Release-July 2015 )〕 The Trust Fund is required by law to be invested in non-marketable securities issued and guaranteed by the "full faith and credit" of the federal government. These securities earn a market rate of interest.〔(Social Security Administration-What are the Trust Funds?-Retrieved July 21, 2015 )〕 Excess funds are used by the government for non-Social Security purposes, creating the obligations to the Social Security Administration and thus program recipients. However, Congress could cut these obligations by altering the law. Trust Fund obligations are considered "intra-governmental" debt, a component of the "public" or "national" debt. As of June 2015, the intragovernmental debt was $5.1 trillion of the $18.2 trillion national debt.〔(U.S. Treasury Direct-Statement of the Public Debt-June 2015 )〕 According to the Social Security Trustees, who oversee the program and report on its financial condition, program costs are expected to exceed non-interest income from 2010 onward. However, due to interest (earned at a 3.6% rate in 2014) the program will run an overall surplus that adds to the fund through the end of 2019. Under current law, the securities in the Trust Fund represent a legal obligation the government must honor when program revenues are no longer sufficient to fully fund benefit payments. However, when the Trust Fund is used to cover program deficits in a given year, the Trust Fund balance is reduced. By 2034, the Trust Fund is expected to be exhausted. Thereafter, payroll taxes are projected to only cover approximately 79% of program obligations.〔(Social Security Trustees Report Press Release-July 2015 )〕 There is controversy regarding whether the U.S. government will be able to borrow sufficient amounts to honor its obligations fully to recipients or whether program modifications are required. This is a challenge for the federal government overall, not just the Social Security program. ==Structure== The "Social Security Trust Fund" comprises two separate funds that hold federal government debt obligations related to what are traditionally thought of as Social Security benefits. The larger of these funds is the Old-Age and Survivors Insurance (OASI) Trust Fund, which holds in trust special interest-bearing federal government securities bought with surplus OASI payroll tax revenues. The second, smaller fund is the Disability Insurance (DI) Trust Fund, which holds in trust more of the special interest-bearing federal government securities, bought with surplus DI payroll tax revenues. The trust funds are "off-budget" and treated separately in certain ways from other federal spending, and other trust funds of the federal government. From the U.S. Code:
The trust funds run surpluses in that the amount paid in by current workers is more than the amount paid out to current beneficiaries. These surpluses are given to the U.S. Treasury (and thus become part of the general federal budget) in exchange for special U.S. government securities, which are deposited into the trust funds. If the trust funds begin running deficits, meaning more in benefits are paid out than contributions paid in, the Social Security Administration is empowered to redeem the securities and use those funds to cover the deficit. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Social Security Trust Fund」の詳細全文を読む スポンサード リンク
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