As answered above, the tax withheld will be in box 4 on the 2020 1099-R that you will receive. When entering into TurboTax say that the money was "moved" to another (or same) account and that the box 1 was the amount rolled over. The box 4 tax will be applied to all other withholding to reduce the total tax owed or increase your refund.
**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.**
