*****Biden was one of 88 senators who voted for a bipartisan bill in 1983 to tax up to 50% of Social Security for beneficiaries with income above a certain threshold. That vote came at a time when the Social Security trust fund for retirement benefits was running out of money. ****** The Government Has Borrowed $1.7 Trillion From The Social Security Trust Fund. The government has borrowed the total value of the Trust Fund to pay for other government spending. Beginning in 2017, the government will have to begin backing up these paper promises with real money.