From July 1, 2012 forward, Irish employers are no longer required to withhold social security taxes (also referred to as PRSI) on non-qualified stock option gains. It is now the employee’s obligation to pay the social security along with income taxes on the taxable income for these stock options. The employee must pay the taxes within 30 days of the stock option taxable event (e.g., the exercise of an option). The removal of the withholding obligations applies to stock options only. RSUs and other stock awards remain subject to income tax and social security withholding.