By donating appreciated stock, you can deduct it from income, twice. So approximately, if someone donates half their wealth she'll pay 0 income tax, which may

By donating appreciated stock, you can deduct it from income, twice. So approximately, if someone donates half their wealth she'll pay 0 income tax, which may be more than her tax burden on the whole amount. Getting this exactly accurate requires detailed accounting, as well as tax sheltering, deductible spending on first class travel as part of her charitable work, deductible payments to children and the value of buying favors and making her personal brand marketable, etc.