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Investing Unit 7: Advantages of Retirement Accounts

Last Updated: January 06, 2009

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Common Advantages of Retirement Accounts

A major advantage of tax-deferred investing is making contributions to a retirement account with pre-tax dollars. In many instances [e.g., 401(k) plans], the government allows taxable income to be reduced by the amount of the contribution to a tax-deferred retirement plan. As a result, you can have the same amount of money in your pocket and invest what you would have paid the government. For instance, if you are in the 25% marginal income tax bracket and you contribute $1,000 to a tax-deferred retirement plan, you would lower your federal income taxes by $250 (0.25 times $1,000). The savings is based on your marginal tax rate, i.e., the rate you pay on the highest dollar of earnings.

There are six different tax rates in 2009-- 10%, 15%, 25%, 28%, 33%, and 35%. The higher your marginal tax rate, the more you, as an investor, benefit from pretax dollar contributions and tax-deferred earnings. Figure 1 shows the 2009 tax rate schedules for your reference in determining marginal tax rates. These figures are adjusted annually for inflation.

Figure 1. 2009 Tax Rate Schedules

Single-Schedule X

Taxable Income Over But Not Over Marginal Tax Rate
$0    $8,350  10%
     8,350    33,950  15%
   33,950    82,250  25%
   82,250  171,550  28%
 171,550  372,950  33%
 372,950 ----  35%

Head of household-Schedule Z

Taxable Income Over But Not Over Marginal Tax Rate
$0  $11,950  10%
   11,950    45,500  15%
   45,500  117,450  25%
 117,450  190,200  28%
 190,200  372,950  33%
 372,950 ----  35%

Married filing jointly or Qualifying widow(er) - Schedule Y-1

Taxable Income Over But Not Over Marginal Tax Rate
$0  $16,700  10%
   16,700    67,900  15%
   67,900  137,050  25%
 137,050  208,850  28%
 208,850  372,950  33%
 372,950 ----  35%

Married filing separately - Schedule Y-2

Taxable Income Over But Not Over Marginal Tax Rate
$0    $8,350  10%
   8,350    33,950  15%
  33,950    68,525  25%
  68,525   104,425  28%
 104,425  186,475  33%
 186,475 ----  35%


A second advantage of tax-deferred investing is that earnings grow faster because they aren't taxed until withdrawn. Instead of paying tax on the interest earned, it continues to compound until the investment is sold. Over time, the gap between the value of a taxable and a tax-deferred account, earning the same rate of interest, increases sharply. See Figure 2 for an example.


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