Data-Driven Analysis of Tax-Gain Harvesting: Utilizing the 0% LTCG Bracket for US ETFs
Empirical analysis of tax-gain harvesting utilizing the 0% Long-Term Capital Gains (LTCG) tax bracket to step up cost basis in taxable accounts.Systematically realizing capital gains up to the federal threshold demonstrates a measurable increase in the portfolio's net-of-tax Compound Annual Growth Rate (CAGR) over a 10-year modeling period.Strategic execution—balancing bid-ask spreads, intraday volatility, and zero-wash-sale penalties for gains—remains the critical variable for maintaining underlying market exposure. The Tax Dilemma: Tax-Advantaged Accounts vs. Taxable Brokerages Monthly $30K investment 20-year compound growth simulation Roth IRA, Traditional IRA, and Taxable Brokerage Tax Efficiency Comparison Evaluating tax-advantaged account performance reveals that the structural elimination of tax drag produces substantial alpha over decadal timelines. Within Roth IRAs or 401(k)s, dividends and capital gains compound without immediate federal tax friction. Conversely, operating a primary US ETF portfolio within a standard taxable brokerage account introduces a severe constraint: the 15% or 20% capital gains tax rate upon liquidation. When a portfolio compounds over a decade, unrealized gains grow exponentially. Liquidating a highly appreciated asset block during retirement triggers immediate and punitive tax liabilities, severely compressing the realized CAGR. [IRS Capital Gains Tax Guide] ...