At whatever your marginal tax rate was for all your other income on your tax return
.......plus a 10% penalty if you are under 59.5 years old and did not roll the $$ into another retirement account or IRA.
.....but whatever tax was withheld does go as a credit against the taxes calculated on ALL your income from the year, in one big pot, including the 1099-R. (As long as you entered the Federal withholding in box 4 on the software form.
___________
State tax could be different...depends on the state.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
