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- 2014-10-14
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4#
发表于 2013-4-2 14:15
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Say you have $ PV. You are considering two options:
Option 1: Give this PV to a Charity, NOW.
Option 2: No donations. Just give what ever you earn from this PV to your Son, AFTER n years.
Now let’s see how your $ PV behaves in above two actions:
Action 1:
:: You give PV to Charity. In n years, PV becomes [ PV * (1+Rg)^n ] . Rg is the expected return on the assets in the Charity’s portfolio.
:: Since you gave $ PV to charity, Government forgoes tax (T oi) on equal amount of your income. For example, if you donate 100,000 to a charity, you don’t need to worry about paying taxes on the 100,000 which you are donating, and IN ADDITION TO THAT you get a tax exemption on 100,000 of your, OTHER, income . So, in your case you saved ( PV * Toi ) on taxes, because of your donation.
In n years, This [ PV * Toi ] becomes [ PV * Toi ] * [ { 1 + Re ( 1 - Tie) } ^ n ]. Re is the return on your investment and Tie is the tax rate on your investment income.
At the end of n years, you can give the above amount to your Son. Value of the amount your Son will receive is: [ PV * Toi ] * [ { 1 + Re ( 1 - Tie) } ^ n ] * [ 1- Te ] . Te is estate tax.
Thus, at the end of n years, after all the transactions, TOTAL future value of your initial $ PV is:
[ PV * (1+Rg)^n ] + [ PV * Toi ] * [ { 1 + Re ( 1 - Tie) } ^ n ] * [ 1- Te ]
Action 2:
After n years your PV becomes [ PV * { 1 + Re ( 1 - Tie) } ^ n ]. Give this to your son. Value of the amount your Son will receive is: [ PV * { 1 + Re ( 1 - Tie) } ^ n ] * [ 1- Te ], which is also the total future value of your initial $ PV.
Relative Value is just the ratio:
[ PV * (1+Rg)^n ] + [ PV * Toi ] * [ { 1 + Re ( 1 - Tie) } ^ n ] * [ 1- Te ] / [ PV * { 1 + Re ( 1 - Tie) } ^ n ] * [ 1- Te ] |
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