Originally Posted by
IntlTax
Siew, Say that $20K of your 401(k) is from pre-tax contributions by either you or your employer and that $5K is from earnings generated on the funds invested in the plan. The $5K would be subject to the 30% flat tax. The $20K would be subject to normal graduated tax rates and the tax due would depend on the amount of the income you earned in that year.
I am not too familiar with the exceptions to the 10% penalty, but unless you are 59 and a half, it seems likely that you would owe a 10% penalty on the full amount distributed.