what is, current withholding share withheld? from and IRA withdrawal?

Answer 1

Generally, the withholding depends on what you tell the holder to withhold. But you're the one responsible for paying the taxes - if enough isn't withheld, you'd need to file quarterly, or pay it with your return and risk paying interest and penalties.

Assuming a traditional IRA, taxes would be at your normal rate, plus a 10% penalty if it was withdrawn before you're 59-1/2 unless you meet an exception allowing you to withdraw it early

Answer 2

There is no withholding requirement for an early withdrawal from an IRA. They withholding is voluntary by you.
The 20% withholding only applies to a distribution by a trustee from a plan such as a 401K plan.

Answer 3

Generally, trustees withhold 20% from any premature withdrawl. This still leaves people short when they do their return plus, usually, there is no withholding for state taxes.