Question
1a.[5] The gross after-taxrate of returnon an investment is the gross after-tax return divided by thenet costof the investment. Thenet costof the investment is the
1a.[5] The gross after-taxrate of returnon an investment is the gross after-tax return divided by thenet costof the investment. Thenet costof the investment is the amount invested minus the reduction in tax if the investment can be subtracted from taxable income. A taxpayer with a 22% marginal tax rate deposits $1000 in a traditional I.R.A., using it to buy shares in a mutual fund, and holds the shares for 25 years. When the shares are sold, the taxpayer's marginal tax rate is still 22%. Explain why the I.R.A. deposit earns a higher gross after-tax rate of return than if it was not deposited in a tax sheltered account, but the same $1000 was used to buy the same number of shares of the same mutual fund and held for the same 25 years.
b.[5] Suppose the mutual fund shares bought with $1000 in part a increase in value by 5% each year. What is their total pretax value at the end of 25 years? Explain how to derive the answer.
c.[5] Under the assumptions of parts a and b, compare the gross after-taxrate of returnof the traditional I.R.A. deposit to the gross after-tax rate of return if the $1000 deposit were in a Roth I.R.A. and used to buy the same mutual fund shares, held for the same 25 years. Explain the comparison.
d.[7] What seems to be the strongest evidence described in the N10 notes supporting the claim that not all the money deposited in I.R.A. accounts is new personal saving induced by the tax sheltering provided by I.R.A. accounts? List the page(s) and paragraph(s) where the evidence is described. Explain how the evidence supports the claim.
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