alt Hacker NewsSocial security is funded through payroll taxes on employees and emloyers. The "run out" is in the sense of the amount of money going out exceeds that coming in and the saved funds have been depleted. In this sense, it can "run out" that the savings are depleted and the plan is cash flow negative.
The narrative and word choices are deliberate. Republicans want to get rid of Social Security. So the narrative is Social Security is fundamentally broken, and it can be silently ended through passive negligence without having to take responsibility for ending a popular entitlement. No matter that it was created with the expectation that Congress would periodically adjust the retirement age to keep it solvent, and that it was always intended to provide only a bare minimum benefit, just enough to keep you out of the poor house. Poor houses were real, common things back then, and what the "free market" will result in.
Social Security revenue and expenditures can easily be balanced in theory. But neither party wants to do the right thing--Democrats want to expand entitlements, and increasing the retirement age as originally designed is the opposite of their goal.