Once a 'one-time' wealth tax is implemented to cover deficits, it removes pressure on politicians to manage finances responsibly. The tax becomes a recurring tool, and the definition of 'wealthy' inevitably expands as the original tax base leaves the jurisdiction.

A controversial feature of the proposed California billionaire tax is its retroactive application. The tax would affect anyone who was a billionaire resident at the start of the year, even if the law passes months later. This legal mechanism is designed to stop wealthy individuals from moving their assets out of state before the vote occurs.

A proposed wealth tax in California triggered a significant flight of capital and high-net-worth individuals, even without becoming law. The key factor was the failure of politicians to uniformly condemn the proposal, which was perceived as a threat to fundamental property rights, signaling a hostile business climate.

Ben Horowitz warns against wealth taxes on unrealized gains by citing Norway's experience. The policy required founders to pay taxes on their private company's rising valuation with illiquid stock, leading to an exodus of entrepreneurs and effectively dismantling the local tech ecosystem.

Contrary to common belief, Arthur Laffer asserts that historical data shows a clear pattern: every time the highest tax rates on top earners were raised, the government collected less tax revenue from them. The wealthy use legal means to avoid taxes, and economic activity declines, ultimately harming the broader economy.

A proposed California wealth tax is reportedly causing a pre-emptive capital flight. Crucially, the exodus includes individuals not directly targeted, who fear the law's scope could easily expand. This demonstrates how the mere threat of a policy can trigger significant economic consequences before it's even enacted.

Threatening to confiscate wealth from the most mobile people incentivizes them to leave. This capital flight has already begun in response to the proposal, proving such policies ultimately reduce the state's long-term tax revenue by driving away the very people they aim to tax.

While popular on the American left, direct wealth taxes have a poor track record in Europe. Countries like France, Sweden, Germany, and others discarded them because they were too complex to administer and ultimately failed to generate enough revenue to be worthwhile. This historical precedent presents a significant practical challenge for proposals like the one in California.

Billionaire wealth taxes are easily dodged by relocating. A more robust policy would tax capital gains based on the jurisdiction where the value was created, preventing billionaires from moving to a zero-tax state just before selling stock to avoid taxes.