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The form 1099-R reports the total distribution in box 1 and the taxable amount - if any - in box 2a.
line 15a - total distribution - from 1099-R box 1 - $90,000
line 15b - taxable part of distribution - from 1099-R box 2a - $90,000
line 61 - federal income tax withheld - from 1099-R box 4 - $18,000 - 20% withholding.