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What is the tax levied against stock portion cashed out of 401k?
You pay tax on the entire amount, not just the capital gains.   When cashing out such a plan you would pay the top marginal tax rate on the full amount plus another 10% in penalties.  It is very likely that the additional income, of the balance withdrawal, will increase your top marginal rate.   It is impossible to come up with a precise answer as we don't know the following: However, you can take a concept away from this that is important:  You will be taxed and penalized on the entire 401K balance, not just the capital gain.   In the "best case" scenario, that is you had little or no income in a given year.  Under current tax law you would owe about 31% of your 401K balance in taxes.  As this is such an inefficient use of money most authors recommend against it except in the case of extreme circumstances.