26 C.F.R. § 1.1402(f)-1
Example (1). B, an individual who files his income tax returns on the calendar year basis, is a member of the ABC partnership, the taxable year of which ends on June 30. B dies on October 17, 1958, and his estate succeeds to his partnership interest and continues as a partner in its own right under local law until June 30, 1959. B's distributive share of the partnership's ordinary income, as determined under paragraphs (d) to (g), inclusive, of § 1.1402(a)-2 , for the taxable year of the partnership ended June 30, 1958 is $2,400. His distributive share, including the share of his estate, of such partnership's ordinary income, as determined under paragraphs (d) to (g), inclusive, of § 1.1402(a)-2 (with the exception of paragraph (e)), for the taxable year of the partnership ended June 30, 1959 is $4,500. The portion of such $4,500 attributable to an interest in the partnership prior to the month following the month in which he died is $4,500 * 4/12 (4 being the number of months in the partnership taxable year in which B died which precede the month following the month of his death and 12 being the number of months in such partnership taxable year in which B and his estate had an interest in the partnership) or $1,500. The amount to be included in the deceased partner's net earnings from self-employment for his last taxable year is $3,900 ($2,400 plus $1,500).
Example (2). If in the preceding example B's estate is entitled to only $1,000, the amount of B's distributive share of partnership ordinary income for the period July 1, 1958 through October 17, 1958, such $1,000 is considered to have been realized ratably over the period preceding B's death and will be included in B's net earnings from self-employment for his last taxable year.
Example (3). X, who reports his income on a calendar year basis, is a member of a partnership which also reports its income on a calendar year basis. X dies on June 30, 1959, and his estate succeeds to his partnership interest and continues as a partner in its own right under local law. On September 15, 1959, X's estate sells the partnership interest to which it succeeded on the death of X. X's distributive share of partnership income for 1959 is $5,500. $600 of such amount is X's share of the gain from the sale of a capital asset which occurs on May 1, 1959, and $400 of such amount is the estate's share of the gain from the sale of a capital asset which occurs on July 15, 1959. The remainder of such amount is income from services rendered. X's distributive share of partnership ordinary income for 1959, as determined under paragraphs (d) to (g), inclusive, of § 1.1402(a)-2 (with the exception of paragraph (e)), is $4,500 ($5,500 minus $1,000). The portion of such share attributable to an interest in the partnership prior to the month following the month of his death is $4,500 * 6/8.5 (6 being the number of months in the partnership taxable year in which X died as precede the month following the month of his death and 8.5 being the number of months in such partnership taxable year in which X and his estate had an interest in the partnership) or $3,176.47.
Example (1). X, an individual who files his income tax returns on a calendar year basis, is a member of the XYZ farm partnership, the taxable year of which ends on March 31. X dies on May 31, 1967, and his estate succeeds to his partnership interest and continues as a partner in its own right under local law until March 31, 1968. X's distributive share of the partnership's ordinary income, determined under paragraphs (d) to (g), inclusive, of § 1.1402(a)-2 , for the taxable year of the partnership ended March 31, 1967, is $1,600. His distributive share, including the share of his estate, of such partnership's ordinary loss as determined under paragraphs (d) to (g), inclusive, of § 1.1402(a)-2 (with the exception of paragraph (e)), for the taxable year of the partnership ended March 31, 1968, is $1,200. The portion of such $1,200 attributable to an interest in the partnership prior to the month following the month in which he died is $1,200 * 2/12 (2 being the number of months in the partnership taxable year in which X died which precede the month following the month of his death and 12 being the number of months in such partnership taxable year in which X and his estate had an interest in the partnership) or $200. X is also a member of the ABX farm partnership, the taxable year of which ends on May 31. His distributive share of the partnership loss described in section 702(a)(9) for the partnership taxable year ending May 31, 1967, is $300. Section 1402(f) and this section do not apply with respect to such $300 since X's last taxable year ends, as a result of his death, with the taxable year of the ABX partnership. Under this paragraph the $200 loss must be included in determining X's distributive share of XYZ partnership income described in section 702(a)(9) for the purpose of applying the optional method available to farmers for computing net earnings from self-employment. Further, the resulting $1,400 of income must be aggregated, pursuant to paragraph (c) of § 1.1402(a)-15 , with the $300 loss, X's distributive share of ABX partnership loss described in section 702(a)(9), for purposes of applying such option. The representative of X's estate may exercise the option described in paragraph (a)(2)(ii) of § 1.1402(a)-15 , provided the portion of X's distributive share of XYZ partnership gross income for the taxable year ended March 31, 1968, attributable to an interest in the partnership prior to the month following the month in which he died (the allocation being made in the manner prescribed for allocating his $1,200 distributive share of XYZ partnership loss for such year), when aggregated with his distributive share of XYZ partnership gross income for the partnership taxable year ended March 31, 1967, and with his distributive share of ABX partnership gross income for the partnership taxable year ended May 31, 1967, results in X having more than $2,400 of gross income from the trade or business of farming. If such aggregate amount of gross income is not more than $2,400, the option described in paragraph (a)(2)(i) of § 1.1402(a)-15 , is available.
Example (2). A, a sole proprietor engaged in the business of farming, files his income tax returns on a calendar year basis. A is also a member of a partnership engaged in an agricultural activity. The partnership files its returns on the basis of a fiscal year ending March 31. A dies June 29, 1967. A's gross income from farming as a sole proprietor for the 6-month period comprising his taxable year which ends because of death is $1,600 and his actual net earnings from self-employment based thereon are $400. As of March 31, 1967, A's distributive share of the gross income of the farm partnership is $2,200 and his distributive share of income described in section 702(a)(9) based thereon is $1,000. The amount of A's distributive share of the partnership's ordinary income for its taxable year ended March 31, 1968, which may be included in his net earnings from self-employment under section 1402(f) and paragraph (a) of this section is $300. The amount of the deceased partner's distributive share of partnership gross income attributable to an interest in the partnership prior to the month following the month of his death as is determined, pursuant to subparagraph (1) of this paragraph, under paragraph (a) of this section is $2,000. An aggregation of the above figures produces a gross income from farming of $5,800 and actual net earnings from self-employment of $1,700. Under these circumstances none of the options provided by section 1402(a) may be used. If the actual net earnings from self-employment had been less than $1,600, the option described in paragraph (a)(2)(ii) of § 1.1402(a)-15 would have been available.
26 C.F.R. §1.1402(f)-1