Although it may be difficult to remember your past Non-Deductible IRA contributions, this financial information is necessary to calculate the Future Value of your Non-Deductible IRA and to determine if you should convert your Regular IRA into a Roth IRA. You may want to reference Form 8606 from the IRS to determine this figure.
 

2012 Federal Income Tax Brackets and Rates

Single Return	Married Filing Jointly Return	Federal Tax Rate
$0—$8,700	$0—$17,400	10%
$8,700—$35,350	$17,400—$70,700	15%
$35,350—$85,650	$70,700—$142,700	25%
$85,650—$178,650	$142,700—$217,450	28%
$178,650—$388,350	$217,450—$388,350	33%
Over $388,350	Over $388,350	35%

What you choose for your tax brackets will have a direct effect on your Future Value calculations. If you choose the same for both your current and expected tax rate at retirement, and all of your previous contributions have been deductible, your Future Value calculations for your Deductible IRA and a Roth IRA will be the same.

Of course, our calculators do not take into consideration all possible variables, and the tax rates are also subject to change in the future. Given that, you may want to consult with a tax advisor or legal counsel for advice and information concerning your particular situation.