Change date
(19) Change date. The change date means the date on which a shift (or any other transaction described in paragraph (a)(2)(i) of this section) that is the last component of an ownership change occurs. (20) Year. A year, or any multiple thereof, means a 365-day period (or a 366-day period in the case of a leap year), or any multiple thereof, unless the year is specifically identified as a taxable year. (21) Old section 382. Old section 382 means section 382, as in effect prior to the effective date of section 382 in the Tax Reform Act of 1986 (the Act), but taking into account section 621(f)(2) of the Act. (22) Pre-change loss. See section 382 and 1.382-2(a)(2) for the definition of pre-change loss. (23) Unrelated. Any two persons are unrelated if the constructive ownership rules of paragraph (h) of this section do not apply to treat either person as owning stock that is owned, directly or constructively, by the other person. (24) Percentage ownership interest. A person's percentage ownership interest in (i) A corporation shall be determined under the rules of this section that are applicable to the determination of a shareholder's percentage stock ownership interest in a loss corporation (see paragraphs (f)(18)(i) through (iii) of this section), (ii) A partnership shall be equal to the relative fair market value of such person's partnership interest to the total fair market value of all outstanding partnership interests, determined without regard to any limited and preferred partnership interest that is described in paragraph (h)(2)(ii)(C) of this section, (iii) A trust shall be determined in accordance with the principles of section 318(a)(2)(B) for determining the constructive ownership of stock, (iv) An estate shall be determined in accordance with the principles of section 318(a)(2)(A) for determining the constructive ownership of stock, and (v) All other entities shall be determined by reference to the person's relative economic interest in the entity, taking into account all of the relevant facts and circumstances.