When you enter the Form 1099-R, you'll enter the amount in box 4 of the Form 1099-R into box 4 of TurboTax's 1099-R form. TurboTax will include this tax withholding on Form 1040 line 64 or Form 1040A line 40 along with withholding shown on any other Forms 1099 or Forms W-2.
