If box 16 is empty, you can fill it with the amount in box 1.
For your donations to charity from your retirement account, in the interview which follows the entry of your form 1099-R, TurboTax will ask you if any portion of your distribution was transferred to charity. Answer Yes to that question and you can then enter the amount transferred to charity.
The code in box 7 of form 1099-R must be 7 and the box IRA/SEP/SIMPLE must be checked.
TurboTax will then reduce the taxable amount by the amount transferred to charity.
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