Deductions & credits

Above comment edited.

You cannot enter a QCD for a qualified Roth distribution into TurboTax.

Per the IRS 1040 line 4 instructions:
"You can't claim a charitable
contribution deduction for any
QCD not included in your income."

Because a qualified Roth distribution is not taxable it would not be included in your income even if not a QCD, so there is noting to deduct.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**