The more AI research I read, the more one question keeps pushing everything else aside. If AI displaces enough workers, who exactly is left to fund the federal government?

The income tax is only 110 years old. Before 1913, the federal government ran almost entirely on tariffs and excise taxes on tobacco and spirits. The 16th Amendment wasn’t ancient wisdom handed down from the founders. It was a design choice, built for an economy that had just produced a massive wage-earning workforce. It has worked exactly as intended, right up until the moment it might not.

84% of U.S. federal revenue comes from individual income and payroll taxes. Not corporate profits. Not VAT. Wages. The entire fiscal architecture of the modern American state is a bet that there will always be enough employed humans earning taxable income to keep the lights on.

What makes this genuinely interesting is where AI is landing. Previous automation waves went after factory floors. This one targets knowledge work, which is largely captured by high-wage roles. The IMF puts 60% of jobs in advanced economies at meaningful exposure. And because the U.S. tax system is steeply progressive (the top 5% already pay 61% of all federal income taxes), you don’t need to displace everyone to crater the revenue model. You just need to displace the right people, most of whom are knowledge workers.

RAND modeled the hard scenario. AI priced at near-zero marginal cost, displaced workers don’t find new roles. Federal revenue drops 25%. Corporate income tax effectively collapses because profit margins in services get competed to nothing by cheap, widely available AI agents.

There are a variety of proposed fixes. Robot taxes, data value taxes, land value taxes, OECD Pillar Two minimum rates. All defensible. All running behind.

So, if an autonomous AI agent runs a company, reinvests its surplus into more AI, and generates no labor income and minimal taxable profit, who funds Social Security? And if the answer is “tax the owners of the AI,” what happens when those owners are sovereign wealth funds or pension funds that are structurally non-taxable to begin with?

The work-tax-benefit loop took a century to build. Whatever replaces it will take time too. The uncomfortable part is that the clock started without anyone calling the meeting.