Sen. Warren's Social Security Fix Relies on the Largest Tax Increase in Over 40 Years, Tax Foundation Calculates

Sen. Elizabeth Warren (D-Mass.) is advancing a plan to eliminate the cap on wages subject to the Social Security payroll tax. Under current law, the 12.4 percent payroll tax applies only to earnings up to $184,500 per year, meaning a single worker cannot pay more than $22,878 into Social Security annually. Warren's proposal would remove that ceiling entirely.

What the Numbers Actually Say

The Tax Foundation calculates that scrapping the cap would be the largest tax increase since 1982. Over ten years, it would generate an estimated $3.2 trillion in new revenue if enacted next year. After accounting for the plan's negative economic effects, the Tax Foundation's estimate drops to $1.5 trillion in net new revenue. The projected costs alongside that include the loss of roughly 1.8 million jobs and a 1.5 percent reduction in total economic output.

The payroll tax is split between employees and employers, each paying 6.2 percent. Warren's framing positions this as a tax on high earners only, since it targets income above the current cap. This is accurate for the employee side. It ignores that every business with high-earning employees would face higher costs on the employer side. Those costs historically filter through the economy as reduced hiring, slower wage growth, higher consumer prices, or lower returns to investors.

The Opportunity Cost Problem

Jessica Riedl, a tax and budget fellow at the Brookings Institution, addressed the arithmetic directly in The Atlantic. Even economists on the left, Riedl wrote, estimate that additional tax revenue begins leveling off once marginal rates hit the high 50s, and revenues can actually decline somewhere between 60 and 73 percent as high earners shift compensation to lower-taxed investments or reduce taxable wages altogether.

The practical implication: pushing tax rates past that inflection point risks generating less revenue than the plan promises, while also crowding out the fiscal space needed for every other federal program. Riedl estimated there may be room to raise marginal rates on high earners by roughly 6 to 12 percentage points before hitting that ceiling. That's a narrower runway than Warren's plan requires.

The Bipartisan Wrinkle

Warren's proposal has drawn at least one Republican co-sign. Sen. Bernie Moreno (R-Ohio) has endorsed eliminating the payroll tax cap, according to Reason. That crossover support suggests the political appeal of framing the measure as a tax on the wealthy can travel across party lines. Whether that coalition can survive the economic counterarguments is a different question.

The Case for Acting Anyway

The strongest argument on Warren's side is the one she keeps making: Social Security is heading toward mandatory benefit cuts, and the alternative to raising taxes is accepting those cuts or blowing out the deficit further with borrowed money. According to Social Security's own estimates cited by Reason, eliminating the payroll tax cap would keep the program out of the red for just four years, and would extend Social Security's solvency by only 21 years — falling well short of a permanent fix.

What Remains Unresolved

No vote on Warren's proposal is currently scheduled, and it faces long odds in a Senate where fiscal conservatives in both parties have resisted large tax increases. The more pointed unresolved question is whether any plan — Warren's, a benefit-cut package, or a hybrid — can pass before the trust fund reaches its depletion threshold. Riedl's Atlantic piece, cited by Reason, frames the available policy space as genuinely constrained: the math on marginal tax rates limits how much revenue is actually available, and the cost of inaction compounds every year Congress delays.

Cutting the gross revenue estimate by more than half once economic effects are factored in is not a rounding error. Americans, Reason argues, ought to be skeptical.