Progressive Wealth Tax Proposals Show Pattern of Expanding Beyond Billionaires, Critics Argue

Progressive lawmakers backing wealth tax proposals are signaling plans that will eventually affect far more than just billionaires, according to critics who point to California Democrat Rep. Ro Khanna’s recent policy document as evidence. Khanna’s manifesto initially focused on taxing billionaires but progressively lowered the threshold to centimillionaires worth $100 million, then to those with $50 million in net worth, raising concerns about where such taxes might ultimately land.

The pattern mirrors the expansion of the federal income tax, which began in 1908 as a tax on the wealthy earning the equivalent of $15 million in today’s dollars but now affects roughly two-thirds of Americans starting at $15,000 in annual income. The marginal tax rate for high earners has climbed from the original 1-7% range to 35% for middle-class workers, with combined state, federal, and payroll taxes pushing rates to 50% in some states like California.

New York City Mayor Zohran Mamdani, a Democratic Socialist, campaigned on taxing billionaires but has already begun pushing tax increases on millionaires, demonstrating the tendency for wealth taxes to expand their scope once enacted. Critics contend that wealth taxes, even if limited to billionaires, would prove economically destructive since most billionaire wealth is invested in operating businesses rather than held as cash reserves.

A 5% annual wealth tax would essentially eliminate investment returns, critics argue, providing little incentive for billionaires to maintain capital in productive enterprises. The Heritage Foundation’s E.J. Antoni warns that broader proposals, including Khanna’s suggestion to fund universal basic income programs with wealth tax proceeds, amount to an unsustainable expansion of government spending.