If you wait until you receive the 1099-R then you will have to amend 2018 to report it.
You should not request any tax be withheld - that just complicates things.
You can take into account any loss on the contribution while it was in the IRA when calculating the amount that must be withdrawn.
**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.**
