The SSA shows that SS revenues are CURRENTLY exceeding expenditures.
https://www.ssa.gov/oact/STATS/table4a3.html
Year /receipts /expenditures/ Net increase/ Asset Reserves at end of year (millions)
2013 /855,021 /822,925 /32,096 /
2,764,431
2014 /884,276 /859,230 /25,046 /
2,789,476
2015 /920,157 /897,123 /23,034 /
2,812,510
2016 /957,453 /922,276 /35,177 /
2,847,687
"Asset reserves at end of year" is the balance in the Trust fund, you see it's increasing each year.
Other sources say that SS is only collecting enough revenues to cover about 75% of the benefits being paid out, and the Trust fund will run out in 2035 ...
"
As long as people continue to work and pay taxes, Social Security will not run out of money, says Alicia H. Munnell, director of the Center for Retirement Research at Boston College.
The numbers fluctuate depending on tax revenue and Social Security benefits, but the system brings in enough money each year to cover roughly three-quarters of the benefits it pays out. “The Social Security system is the simplest system in the world,” says Munnell, who was previously on the President’s Council of Economic Advisers and served as assistant secretary of the Treasury for economic policy. “Money comes in and money goes out.”
So what’s all the talk of insolvency? That refers to the Social Security Trust, which is a surplus that was built up when taxes collected exceeded benefits paid out. The trust makes up the difference between money coming in via Federal Insurance Contributions Act (FICA) taxes and money paid out. “
Once that is gone, the system will only be able to pay the 75% covered by the payroll tax,” she says. “The system is not going to zero. It is going to 75%.”
So depending on which source you believe, either the SS fund is going to be just fine, or in about 20 years it's going to be able to pay for only about 75% of benefits.
For such an unclear outcome 20 years in the future, I think making any major changes to they system in premature. Let's leave the system as/is until 2025-ish, and then start worrying about it. We're not going to be able to predict the employment and economic trends for the mid 2030s this far in advance. Let's wait till we're within a decade of draining the fund and see what the trends are then.