Capital Gains Tax

A capital gains tax (CGT) applies to the gain—the difference between an asset's sale price and its cost basis—rather than to the gross sale proceeds or to the asset's mere appreciation while held. Most jurisdictions tax gains only upon realization (sale or disposal), not on paper appreciation, although some proposals (notably "mark-to-market" or wealth-tax variants) would tax unrealized gains.

Tax systems typically distinguish short-term from long-term gains. In the United States, assets held one year or less are taxed at ordinary income rates, while long-term gains face preferential rates of 0%, 15%, or 20% depending on income, plus a 3.8% Net Investment Income Tax introduced under the Affordable Care Act (2013). The United Kingdom applies separate CGT rates with an annual exempt amount that has been reduced in recent budgets. Several jurisdictions, including Singapore, Hong Kong, New Zealand (for most assets), and Switzerland (for private individuals' securities), levy no general CGT.

Policy debates around CGT typically center on:

• Efficiency vs. equity. Lower rates are defended as encouraging investment and offsetting the "lock-in effect," where investors delay sales to defer tax. Critics argue preferential treatment disproportionately benefits high-income households, since capital ownership is concentrated.
• Inflation indexing. Because nominal gains include inflation, some economists advocate indexing the cost basis; few systems do so consistently.
• Step-up in basis. In the U.S., inherited assets receive a basis reset at death, eliminating accrued CGT liability—a provision repeatedly targeted for reform.
• International coordination. The OECD/G20 Inclusive Framework and the Common Reporting Standard (CRS, 2014) have expanded cross-border information sharing, making it harder to hide gains in offshore accounts.

For MUN and IR researchers, CGT is relevant in debates on illicit financial flows, tax competition, sovereign revenue mobilization (especially in ECOSOC and FfD forums), and inequality.