Congress targets billionaires with annual tax on unrealized investment gains
H.R. 5427 — Billionaires Income Tax Act · Filed by Steve Cohen (D-TN) · 33 cosponsors · Introduced Sep 17, 2025 · Referred to committee
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What it does
This bill creates a new annual tax on billionaires and ultra-wealthy individuals, requiring those with over $100 million in income or $1 billion in assets to pay tax on the unrealized gains in their investment holdings each year, even if they haven't sold those assets. The tax applies to tradable assets (stocks, bonds) annually and nontradable assets (private businesses, real estate) when transferred or sold. Wealthy individuals entering this tax bracket can spread the initial tax bill over five years.
Why we flagged it
The bill's core mechanism is an annual tax on unrealized gains for ultra-high-net-worth individuals and entities, fundamentally restructuring how capital gains are taxed for the wealthiest Americans.
What the text implies
- Valuation disputes will likely become a major source of IRS litigation, as billionaires challenge annual fair-market-value determinations on illiquid assets like private businesses and real estate.
- The five-year installment option for first-year tax liability may incentivize wealthy individuals to accelerate asset sales or restructure holdings before the law takes effect to avoid the tax.
The full analysis lists 5 implications of this text.
Who stands to gain
U.S. federal government (revenue collection); Tax compliance and accounting firms (increased audit and valuation work); IRS (expanded enforcement resources)