You can't simply deduct the amounts in box 5 and 9b from the amount in box 1 to determine the taxable amount of a pension plan distribution reported on form 1099-R. The amounts in box 5 and 9b may refer to contributions in other periods besides the current period.
When you enter the form 1099-R in TurboTax, the program will ask you the pertinent questions to determine the taxable amount of your pension plan distribution in the current year.
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