The regular income tax rate plus a 10% penalty. Talk to your broker or IRA custodian about setting up the withdrawals under "72t". The section states that you must take equal withdrawals every year for at least 5 years or until you are age 59 1/2, whichever is longer (59 1/2 in your case). This provision eliminates the 10% penalty, but the regular income tax will still apply. Hardship provisions also eliminate the penalty as does money withdrawn to pay health insurance. The hardship provision is difficult to meet unless your home is in emminent danger of foreclosure or you have a serious medical condition not covered by insurance.