Current age: Your current age.
Age of retirement: Age you wish to retire. We calculate the ending balance at retirement for each of your rollover options.
Federal income tax rate: Consult the table below to determine your federal tax bracket. If you are unsure, the calculator will choose 25%. Please note that state taxes are entered in a separate entry field.

Filing Status and Income Tax Rates 2008 Caution: Do not use these tax rate schedules to figure 2007 taxes. Use only to figure 2008 estimates.
Tax rate	Married filing jointly or Qualified Widow(er)	Single	Head of household	Married filing separately
10%	$0 - 16,050	$0 - 8,025	$0 - $11,450	$0 - 8,025
15%	$16,051- 65,100	$8,026- 32,550	$11,451- 43,650	$8,026- 32,550
25%	$65,101- 131,450	$32,551- 78,850	$43,651- 112,650	$32,551- 65,725
28%	$131,451- 200,300	$78,851- 164,550	$112,651- 182,400	$65,726- 100,150
33%	$200,301- 357,700	$164,551- 357,700	$182,401- 357,700	$100,151- 178,850
35%	over $357,700	over $357,700	over $357,700	over $178,850

Source: http://www.irs.gov/formspubs/article/0,,id=164272,00.html

State income tax rate: The current state marginal tax rate you expect to pay on any additional income or taxable distributions.
Current 401(k) balance: The starting balance or current amount you have invested or saved in your 401(k).
Annual rate of return: The annual rate of return for your 401(k) account. The actual rate of return is largely dependent on the type of investments you select. From January 1970 to December 2007, the average compounded rate of return for the S&P 500, including reinvestment of dividends, was approximately 11.4% per year (source: www.standardandpoors.com). During this period, the highest 12-month return was 61%, and the lowest was -39%. Savings accounts at a bank pay as little as 1% or less.
It is important to remember that future rates of return can't be predicted with certainty and that investments that pay higher rates of return are subject to higher risk and volatility. The actual rate of return on investments can vary widely over time, especially for long-term investments. This includes the potential loss of principal on your investment. It is not possible to invest directly in an index, and the compounded rate of return noted above does not reflect additional sales charges and fees that funds may charge.