Assuming the Trustees' intermediate assumptions are realized, the deficit of 1.92 percent of payroll indicates that financial adequacy of the program for the next 75 years could be restored if the Social Security payroll tax were immediately and permanently increased from its current level of 12.4 percent (combined employee-employer shares) to 14.32 percent.
As I said, I don't support doing that because a) "pre-funding" is a sucker's game as long as Zombie Greenspan and his Republican Acolytes roam the Earth and b) it makes the tax code more regressive. But, nonetheless it's pretty damn painless.