If you are younger than 59 1/2 there is a 10% early withdrawal penalty for taking the money out. And there will always be ordinary income tax --at whatever tax bracket you are in. In January you get a 1099R for the distribution from the retirement account and must enter it on your tax return. Usually when you take money out of a retirement account you can have some tax withheld -- just like you have withheld from your paychecks. If you do that, you will be entering the amount that was withheld when you enter the 1099R.
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