SIGNAL
The U.S. tax base is not exposed to job loss in general. It is exposed to job loss in one tier, the high-income, white-collar roles where individual and payroll taxes are concentrated, and the same shock that spares the aggregate erodes the base.
RAND's new scenario work makes the arithmetic visible. In 2024, 84 percent of federal revenue came from either individual taxes or payroll taxes, both of which are collected from labor income. Because income at the top of the labor distribution carries the federal revenue load — RAND's simulation models this concentration effect under stated displacement and reemployment assumptions — AI displacement of those roles cuts deeper than headline job numbers suggest. The corporate backstop will not close the gap. Under RAND's stated AI pricing and displacement scenarios, AI-driven profits would have to be taxed at materially higher rates than today's corporate rate to substitute for the labor-derived revenue lost in either the full or transitional scenarios. Add a credible deflation path under widely accessible AI, and the corporate cushion thins further.
The choice RAND's scenario work hands the country is timing. The tax base can be rebuilt before the displacement wave, while fiscal windows are open and policy has room, or after, when the budget absorbs the shock and the rebuild happens under duress. The variable is not whether labor displacement arrives. It is whether Washington redesigns the fiscal architecture first.