Section 411.540 - How are the payment amounts calculated for each of the milestones?(a) For both title II disability beneficiaries and title XVI disability beneficiaries, the payment amount for each of the Phase 1 milestone payments is equal to 120% of the payment calculation base for title II (as defined in § 411.500(a)(1) ) for the calendar year in which the month of attainment of the milestone occurs, rounded to the nearest whole dollar.(b) The payment amount for each of the Phase 2 milestones:(1) For title II disability beneficiaries (including concurrent title II/title XVI disability beneficiaries) is equal to 36% of the payment calculation base as defined in § 411.500(a)(1) for the calendar year in which the month of attainment of the milestone occurs, rounded to the nearest whole dollar;(2) For title XVI beneficiaries (who are not concurrently title II disability beneficiaries) is equal to 36% of the payment calculation base as defined in § 411.500(a)(2) for the calendar year in which the month of attainment of the milestone occurs, rounded to the nearest whole dollar.