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1099-R for an old Contributory IRA with after tax $ has "taxable amount" = entire distribution and "taxable amount not determined" box checked. How do I adjust for this?
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Retirement tax questions
It looks like you may have an IRA account built over the years with both deductible and nondeductible contributions. If all contributions were tax-deductible, then all your IRA withdrawal will be considered taxable income.
In your case it looks like you also had some nondeductible contributions included in your account, So, you may have to figure out how much of your account is made up of nondeductible contributions. Here is a quick way of calculation the taxable amount:
To find the nondeductible portion, take the nondeductible contributions and divide by the current value of your IRA account.
nondeductible contributions
nondeductible portion = ----------------------------------------
IRA account value
Then you will subtract the result of the above from 1 to come up with percentage of the taxable portion of your IRA
taxable portion = 1 - nondeductible portion
Take this percentage number and multiply it by the amount you withdrew to arrive at the taxable amount of your withdrawal.
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Retirement tax questions
TurboTax will automatically prepare Form 8606 to calculate the taxable amount. After you enter the Form 1099-R exactly as received and answer the immediate follow-up questions, click the Continue button on the Your 1099-R Entries page to reach the questions where you can enter or confirm your basis in nondeductible traditional IRA contributions and your year-end balance in traditional IRAs, the information necessary to complete the calculation.