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qyang · 2021年03月31日

Why the formular the same?

NO.PZ2018091705000036

问题如下:

Tom’s payment can be invested in Tax-deferred account or Tax-exempt account. We assume that

1. Contributions in Tax-deferred account are not taxed, but withdrawals from this account will be taxed at 30 percent.

2. Contributions in Tax-exempt account are taxed at 15% tax rate, but withdrawals from this account will be not be taxed.

Which account should Tom choose?

选项:

A.

Tax-deferred accounts

B.

Tax-exempt accounts

C.

Uncertain.

解释:

B is correct.

考点Types of investment accounts

解析如果Tom把钱投资于递延账户资金放进去时不需要交税但是资金取出时需要征收30%的税那么投资期结束时账户里资产价值为FVTDA=PV(1+R)n(10.3)F{V_T}_{DA}=PV{(1+R)}^n(1-0.3)

如果Tom把钱投资于免税账户资金放进去时需要征收15%的税但是资金取出时不需要交税那么投资期结束时账户里资产价值为FVTEA=PV(1+R)n(10.15)FV_{TEA}=PV{(1+R)}^n(1-0.15)

由此可得Tom 把钱投资于免税账户比较划算

A teacher said:


Tax-exempt account:

假设本金$1, 放进Tax-exempt账户只需要每次contributions的时候交15%税,取出的时候不需要额外交税,所以在15年后,当你取出的时候,你手上的金额应该为1*(1-15%)*(1+r)^n。

如果不用交税你应该获得1*(1+r)^n,所以tax drag是1*(1+r)^n*(15%)。


But, why don't we use [1*(1-15%)*(1+r)] ^ n? We paid tax at the beginning, not when we withdrew n years later.

白河寒秋 · 2021年08月25日

TEA账户,不用对资产增值部分收capital gain tax,只需要对一开始contribution交。按你的公式其实是每年都在收。

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已采纳答案

王暄_品职助教 · 2021年03月31日

Since this is only the issue about orders. In a TDA, the FV = PV(1+r)^n(1-withdraw tax), where withdraw tax = 30%, then you can rewrite it as : FV = PV(1+ r)^n(1-30%) In a TED, since we only paying contributions tax, then FV = PV(1-contribution tax)(1+r)^n, where contribution tax = 15, then you should rewrite it as FV = PV(1-15%)(1+r)^n. So there is obviously no difference between FV = PV(1-15%)(1+r)^n and FV = PV(1+r)^n(1-15%)

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