attributable income
(4) Determinations with respect to attributable income made under paragraph (d)(1) and (2) of this section, shall be made in the same manner, including the same sources of income and exclusions from income, as determinations with respect to income are made for determining eligibility for pension under 3.271 and 3.272 of this title. The term attributable income means income of a veteran for the calendar year preceding application for care, determined in the same manner as the manner in which a determination is made of the total amount of income by which the rate of pension for such veteran under 38 U.S.C. 1521 would be reduced if such veteran were eligible for pension under that section.