# Capital Gains **The model:** Profit from the sale of an investment asset (stock, bond, real estate, business interest) at a price higher than the purchase price. Along with [[Dividend Payments]], capital gains are one of the two primary returns to capital ownership. The U.S. tax code treats capital gains differently from labor income — typically taxed at lower rates — which is one of the most economically and politically consequential features of the tax system. The political importance comes from distribution: capital ownership is highly concentrated. The top 10% of households owns about 90% of stock-market wealth. Capital gains tax preferences therefore disproportionately benefit a small high-income group. The right-wing project's commitment to capital-gains-rate cuts is rational coalition behavior; whether it serves the public interest is a separate question. ## The Mechanism **Realization, not accrual.** Capital gains are taxable when assets are *sold* (realized), not when their value rises. Holders of appreciating assets can defer tax indefinitely by not selling. This creates "lock-in" effects (people hold assets longer than they otherwise would, to avoid the tax) and produces a large tax base of unrealized gains that escape taxation entirely if held until death (where they receive a "step-up in basis," resetting the cost basis to the date-of-death value). **Long-term vs. short-term.** Assets held more than one year qualify for preferential "long-term" rates (currently 0% / 15% / 20% depending on income, plus 3.8% Net Investment Income Tax for high earners). Short-term gains (held less than one year) are taxed as ordinary income (top rate 37%). The differential is large and creates incentives to time sales for tax purposes. **Step-up in basis at death.** A major feature of U.S. capital-gains taxation: when an asset-holder dies, the asset's cost basis resets to the date-of-death value. Heirs can sell immediately without paying tax on the prior appreciation. The result is a permanent dynastic-wealth-friendly feature of the tax code — unrealized gains can compound across generations without taxation. **Inflation matters.** Capital gains are typically calculated nominally — the difference between sale price and purchase price in unadjusted dollars. Inflation thus inflates "real" gains, sometimes producing tax bills on what are actually losses in real terms. Indexing capital gains to inflation has been repeatedly proposed; opposition comes from revenue concerns. ## KB Applications ### Capital Gains Preferences and Wealth Concentration The preferential capital-gains rate is one of the largest tax-code features driving wealth concentration. Combined with the step-up in basis, the structure allows wealthy households to accumulate unrealized gains, defer them indefinitely, and pass them to heirs with the tax bill effectively erased. The empirical literature on inequality (Saez, Zucman, Piketty) treats this combination as one of the major engines of the post-1980 wealth concentration. Policy proposals to change it (mark-to-market taxation of unrealized gains, elimination of step-up at death, equalizing capital-gains rates with labor-income rates) face concentrated opposition because the affected population is small and intensely engaged. ### The Buffett Rule [[Warren Buffett]]'s much-discussed observation that he pays a lower effective tax rate than his secretary is precisely a capital-gains-preference observation. Buffett's income is overwhelmingly capital gains and dividends; his secretary's is overwhelmingly labor income. The 23.8% top capital-gains rate (20% + 3.8% NIIT) is dramatically lower than the 37% top ordinary-income rate, even before accounting for FICA payroll taxes that don't apply to capital gains. The "Buffett Rule" proposed minimum tax on millionaires has been periodically revived; its core observation is robustly empirical. ### Why Republicans Always Cut Capital Gains Each major Republican tax cut (1981, 2001, 2003, 2017) has reduced capital-gains rates or expanded preferences. The structural reason is coalition: the high-income donor class has concentrated capital-gains exposure; Republican voters at lower income levels are largely indifferent (most have no capital gains beyond home sales, which have specific exemptions). The political math therefore consistently favors capital-gains rate reductions over labor-income rate reductions, even though the latter would benefit a much larger Republican-voter base. ### The Carried Interest Loophole A specific high-leverage feature: hedge-fund and private-equity managers' performance fees ("carried interest") have historically been treated as capital gains rather than labor income, taxed at the preferential rate. The treatment is economically unjustifiable (the income is for management services, not for the manager's own capital) but politically durable across multiple administrations. Both Trump and Biden campaigned on closing it; neither did. The carried-interest persistence is a microcosm of how capital-gains tax preferences survive the empirical and ethical critiques against them. ## See Also - [[Compound Interest]] — capital gains compound when reinvested; the tax treatment determines how quickly - [[Dividend Payments]] — the other major return to capital ownership - [[Inflation]] — what erodes nominal capital gains - [[Trickle-Down Economics]] — the broader policy frame