Example: A, an individual on a calendar year basis, purchased certain shares of stock subsequent to February 28, 1913, for $10,000. On January 1, 1954, A's adjusted basis for the stock had been reduced to $1,000 by reason of receipts and distributions described in sections 1016(a)(1) and 1016(a)(4). He received in 1954 a further distribution of $5,000, being a distribution covered by section 1016(a)(4), other than a distribution out of increase of value of property accrued prior to March 1, 1913. This distribution applied against the adjusted basis as required by section 1016(a)(4) exceeds that basis by $4,000. The $4,000 excess is a gain realized by A in 1954 and is includible in gross income in his return for that calendar year. In computing gain from the stock, as in adjusting basis, no distinction is made between items of receipts or distributions described in section 1016. If A sells the stock in 1955 for $5,000, he realizes in 1955 a gain of $5,000, since the adjusted basis of the stock for the purpose of computing gain or loss from the sale is zero.
Generally, subdivisions (i), (ii), and (iii) refer to an interest, present or future, in the income from property or the right to use property which will terminate or fail on the lapse of time, on the occurrence of an event or contingency, or on the failure of an event or contingency to occur. Such divisions do not refer to remainder or reversionary interests in the property itself or other interests in the property which will ripen into ownership of the entire property upon termination or failure of a preceding term interest. A term interest in property also includes any property received upon a sale or other disposition of a life interest in property, an interest in property for a term of years, or an income interest in a trust by the original holder of such interest, but only to the extent that the adjusted basis of the property received is determined by reference to the adjusted basis of the term interest so transferred.
26 C.F.R. §§1.1001-1