<human>:  When will the Social Security trust fund run out?
<bot>: The Social Security trust fund is projected to run out in 2034. The US government has been paying into Social Security since the 1930s, and now the program is facing a cash flow problem. This is because the Social Security system is not sustainable. The program will not be able to pay out all of its benefits, and the US government will have to pay for the shortfall.