The Committee for a Responsible Federal Budget blogs that the tax of fixing Social Security solvency is getting tougher:
A hypothetical solution that would have closed the shortfall last year now only closes about 95 percent of the shortfall. Previously, a 2.9 percentage point tax increase (raising the combined payroll tax from 12.4% to 15.3%) would be enough to solve the shortfall. Now, that increase would need to be 3.1 percent. Similarly, a 17.5 percent reduction in all benefits would have addressed the shortfall last year, but it would need to be 18.4 percent this year. Furthermore, these options assume the changes are made immediately. Waiting 20 years requires changes to be 50 percent larger.
Check out their full blog here.