If you are not 59 1/2 then you will pay taxes based on your tax bracket plus a 10% penalty. Now there are some conditions where you can take out the money without paying the penalty (but you still pay the tax) including:
Down payment on purchase of primary residence
If you are completely disabled
You should never ever borrow from your 401k if you can help it. It ends up costing you a ton of money. Even loans and credit cards are better than using you retirement account.


