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You have 6K of spare pre-tax income that you're looking to invest for the future. Today you are in a combined federal+state marginal tax bracket of 20%. You are anticipating that in 40 years your marginal tax bracket on your retirement income will be 11%. If you decide to invest this money in a Roth IRA, and earn earn an average annual rate of return of 8.4%, how much will you have in 40 years after withdrawing from the IRA?

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User DLight
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1 Answer

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If you decide to invest your $6,000 of spare pre-tax income in a Roth IRA, you will not get an immediate tax deduction like you would with a Traditional IRA. However, the advantage of a Roth IRA is that qualified withdrawals, including both contributions and earnings, are tax-free in retirement.

To calculate how much you will have in 40 years after withdrawing from the Roth IRA, follow these steps:

Calculate the growth of your initial $6,000 investment at an average annual rate of return of 8.4% over 40 years.

Determine the future value of this investment, taking into account that all withdrawals from a Roth IRA are tax-free.

Let's calculate the future value:

Step 1: Calculate the growth of the initial investment:

You invest $6,000 in a Roth IRA, and it grows at an average annual rate of return of 8.4% over 40 years. You can use the compound interest formula:

Future Value (FV) = P(1 + r/n)^(nt)

Where:

P = Principal amount ($6,000)

r = Annual interest rate (8.4% or 0.084)

n = Number of times interest is compounded per year (assuming it's compounded annually, so n = 1)

t = Number of years (40)

FV = $6,000 * (1 + 0.084/1)^(1*40)

FV = $6,000 * (1.084)^40

FV ≈ $38,098.13

Step 2: Since Roth IRA withdrawals are tax-free, you will have the full amount available to you:

Total After 40 Years = $38,098.13

So, after 40 years, you will have approximately $38,098.13 in your Roth IRA after withdrawing from it, and this amount is entirely tax-free.

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User Krembanan
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