Khanna believes the state’s wealthiest residents should contribute more because their fortunes benefited from government-funded innovation.
But critics see a much bigger problem: taxing wealth that exists primarily on paper could force business owners to sell assets and potentially encourage more wealthy residents to leave California.
The dispute has become one of the state’s most consequential economic debates ahead of the November 3 election.
Khanna Delivers a Message That Sounds Familiar
During an appearance on the Conversate with Killer Mike podcast, Khanna defended the proposed tax by challenging the idea that billionaires created their fortunes entirely through individual effort.
“You didn’t build this money yourself,” Khanna declared.
He acknowledged that successful entrepreneurs often possess extraordinary talent and work ethic, but argued that public investments also contributed to their financial success.
“Yeah, you were entrepreneurial, you had some genius, you worked hard, but we also had the government basically fund the Internet.”
The remarks immediately drew comparisons to former President Barack Obama’s controversial 2012 campaign statement, “you didn’t build that.”
Obama’s original comments concerned the public infrastructure and institutions that help businesses succeed. His political opponents interpreted the remark as diminishing the accomplishments of entrepreneurs.
Khanna is now making a related argument about the enormous fortunes accumulated in Silicon Valley.
The California Democrat maintains that government-supported research helped create the technological foundations behind today’s most valuable companies.
For Khanna, that connection helps justify requiring billionaires to surrender a portion of their accumulated wealth.
Opponents argue that public investment does not eliminate the financial risks, private capital, or years of work required to build successful companies.
A Five Percent Tax With Enormous Financial Consequences
Proposition 40 would apply to individuals whose net worth exceeds $1 billion and who were California residents on January 1, 2026.
Unlike traditional income taxes, the proposal would target accumulated assets.
That distinction has become central to the controversy.
A technology founder might own billions of dollars in company stock without holding anything close to that amount in cash.
Nevertheless, the proposed tax would be calculated using the value of covered assets, including business interests, securities, and intellectual property.
Consider an entrepreneur with $10 billion in taxable net worth.
A 5 percent assessment could produce a $500 million tax obligation.
The proposal would allow qualifying taxpayers to spread payments over five years, although doing so would increase the total amount owed.
Supporters argue that such extraordinary fortunes justify an additional contribution to public services.
Opponents counter that a substantial tax on illiquid wealth could create pressure to sell company shares or restructure ownership.
The official ballot analysis estimates that Proposition 40 could generate tens of billions of dollars over several years.
However, California’s fiscal analysts also acknowledge considerable uncertainty about the final amount.
Mark Cuban Challenges the Economics
Billionaire entrepreneur Mark Cuban has also entered the broader debate over taxing unrealized wealth.
Cuban, who has frequently criticized Republican politicians, raised concerns about what happens when business founders face major tax obligations without sufficient cash to pay them.
“You don’t understand business, Ro,” Cuban wrote in the social media exchange described in reports about the controversy.
His objection focused on the potential consequences for entrepreneurs whose financial fortunes are tied to privately held businesses.
“Can’t sell shares, we will sell it for you, to whoever. F**k you.”
Cuban characterized the prospect as “the biggest f**k you in the history of entrepreneurship.”
His criticism highlights a practical question surrounding wealth taxation: How should governments collect taxes on assets that may be difficult to sell or accurately value?
Proponents maintain that sophisticated valuation procedures and payment arrangements can address those challenges.
Critics remain concerned that the tax could create financial complications for founders whose wealth is concentrated in a single company.
California’s Wealthiest Residents Reconsider Their Future
The billionaire tax fight has also intensified scrutiny of California’s relationship with its technology industry.
Google co-founder Sergey Brin has become a prominent opponent of Proposition 40 and has helped finance competing ballot measures designed to prevent it from taking effect.
The broader controversy has fueled reports about wealthy individuals reconsidering their California residency and business arrangements.
Those developments matter because California relies heavily on income tax payments from high earners.
If wealthy residents establish permanent homes elsewhere, the state could lose future income tax revenue even if it successfully collects the proposed one-time wealth tax.
California’s Legislative Analyst’s Office estimates that behavioral changes among billionaires could reduce ongoing state income tax collections by less than $1 billion annually.
That projection underscores the difficult trade-off facing state policymakers.
A wealth tax could generate a substantial short-term windfall, but changes in residency and investment behavior could have longer-lasting consequences.
Whether the proposed levy would ultimately strengthen or weaken California’s broader economy remains disputed.
Gavin Newsom Breaks With His Own Party
Perhaps the most revealing development is the opposition coming from Democratic Governor Gavin Newsom.
Newsom has publicly rejected Proposition 40 despite supporting the idea of greater taxation of extreme wealth at the national level.
He argues that a state-level wealth tax creates different economic incentives because wealthy individuals can move between states.
The governor has also endorsed Proposition 42, a competing measure that would prohibit certain retroactive taxes and restrict future state taxes on personal property.
If Proposition 42 receives more affirmative votes than Proposition 40, it could prevent the billionaire tax from taking effect.
Khanna has sharply criticized Newsom’s position.
“You can’t pretend to be anti-Trump if you’re doing the bidding of Trump donors,” Khanna said during the political dispute.
The disagreement has exposed competing priorities within California’s Democratic coalition.
Khanna and Senator Bernie Sanders argue that taxing billionaire wealth is necessary to address inequality and protect essential services.
Newsom and other opponents warn that the proposal could undermine the state’s long-term finances.
The disagreement extends beyond elected officials.
Several healthcare, education, and labor organizations have also taken opposing positions on the measure.
Europe’s Experience Adds Another Dimension
California’s proposal arrives after decades of international debate over taxes on accumulated wealth.
Several European countries previously operated broad wealth taxes before repealing them.
Sweden, Denmark, Austria, Finland, and France are among the countries frequently cited in arguments against such policies.
France replaced its broad wealth tax in 2018 with a narrower tax focused on real estate wealth.
Norway continues to impose a net wealth tax, although the policy has generated controversy over wealthy residents relocating abroad.
Opponents of California’s initiative point to these examples as evidence that taxing accumulated wealth can create administrative challenges and incentives for capital flight.
Supporters counter that international experiences differ substantially and that California’s proposal is a one-time levy rather than an annually recurring tax.
Those differences make direct comparisons difficult.
Nevertheless, the European experience has become an important part of the economic debate surrounding Proposition 40.
Could the Tax Eventually Reach Beyond Billionaires?
Another argument raised by opponents concerns the precedent Proposition 40 could establish.
The current proposal is explicitly directed at billionaires.
Its official provisions generally exclude real estate, pensions, and retirement accounts from the calculation of taxable wealth.
It does not authorize an automatic expansion of the tax to ordinary homeowners or retirement savers.
However, critics worry that establishing a new tax on accumulated wealth could encourage future efforts to lower the threshold.
Such a change would require additional legal or legislative action rather than occurring automatically under Proposition 40.
Supporters reject the suggestion that the current initiative is designed to target middle-class Californians.
They emphasize that the measure would affect only a small number of extraordinarily wealthy residents and dedicate 90 percent of its revenue to healthcare services.
The remaining funds would support education, food assistance, and administration.
The question for voters is whether those potential benefits outweigh the economic and fiscal risks identified by opponents.
A Political Fight With National Implications
With Election Day approaching, California’s billionaire tax debate has become more than a dispute over state revenue.
It is also testing competing visions of economic policy within the Democratic Party.
Khanna sees the extraordinary wealth created by Silicon Valley as an opportunity to expand public investment.
Newsom and other critics see the danger of adopting a tax that could change where wealthy individuals choose to live and invest.
Technology entrepreneurs, meanwhile, are confronting the possibility that their company valuations could create enormous tax liabilities even without a corresponding cash payout.
And the official fiscal projections leave considerable uncertainty about how much revenue the state would actually receive.
For California voters, the choice on November 3 will determine whether the state moves forward with a new approach to taxing billionaire wealth.
For the rest of the country, the outcome could shape future debates over whether governments should tax accumulated assets in addition to income.
Khanna’s remarks have brought Obama’s famous campaign controversy back into the spotlight.
But the larger question now is not who deserves credit for building Silicon Valley.
It is how much of the wealth created there California should tax — and what economic consequences might follow.
